The INA is a card file and online reporting system maintained at the Silva Center for Phycological Documentation of the University Herbarium, University of California, Berkeley. It contains nearly 200,000 names of algae (in the broad sense). The BPU is a card file containing bibliographic references pertaining to algal taxonomy.
A working list of algal type specimens at UC is available here
Results from INA database
| Name | Author | Source | Citation | Year |
|---|---|---|---|---|
| PARAPLACONEIS | M.S. Kulikovskiy, H. Lange-Bertalot, & D. Metzeltin in Kulikovskiy et al. | Iconogr. Diatomol. | 23: 216 | 2012 |
| Paraplaconeis ampla | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 189, pl. 114 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis anfracta | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 189, pl. 115 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis arcuata | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 189, pl. 116 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis australis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 117 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis baicalensis | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 118 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis baikalensis | (Skvortzov) M.S. Kulikovskiy, D. Metzeltin & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 218 | 2012 |
| Paraplaconeis compositestria | (Jasnitsky) M.S. Kulikovskiy, D. Metzeltin & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 218 | 2012 |
| Paraplaconeis cracoviensis | H. Lange-Bertalot & A.Z. Wojtal | Beih. Nova Hedwigia | 143: 410, figs. 49-60, 65-67, 80, 81 | 2014 |
| Paraplaconeis decorata | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 120 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis dimidia | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 121 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis dissimilis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 122 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis elongata | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 123 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis foliaris | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 190, pl. 124 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis graciosa | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 218, pl. 133: figs. 1-4 | 2012 |
| Paraplaconeis interrupta | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 125 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis kornevae | M.S. Kulikovskiy, E.S. Gusev, & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 219, pl. 135: figs. 8-13; pl. 137: figs. 1-3; pl. 138: figs. 1-5 | 2012 |
| Paraplaconeis lacustris | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 126 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis litoralis | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 123 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis macedonica | (Z. Levkov & D. Metzeltin) M.S. Kulikovskiy, D. Metzeltin & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 222 | 2012 |
| Paraplaconeis maculata | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 128 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis maculata | M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 222 | 2012 |
| Paraplaconeis magna | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 129 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis ohridana | (Z. Levkov & D. Metzeltin) M.S. Kulikovskiy, D. Metzeltin & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 222 | 2012 |
| Paraplaconeis placentula | (Ehrenberg) M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 222 | 2012 |
| Paraplaconeis pomazkinae | D. Metzeltin, M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 220, pl. 134: figs. 5 | 2012 |
| Paraplaconeis prespanensis | (Z. Levkov, S. Krstic & T. Nakov) M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 223 | 2012 |
| Paraplaconeis propria | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 130 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis pseudoplacentula | (N. Foged & M. Møller) V.S. Vishnyakov in Vishnyakov et al. | Bot. Zhurn. | 101: 1305 | 2016 |
| Paraplaconeis recta | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 191, pl. 131 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis signum | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 192, pl. 132 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis steninae | D. Metzeltin, M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 221, pl. 135: figs. 5-7 | 2012 |
| Paraplaconeis subplacentula | (Hustedt) M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 223 | 2012 |
| Paraplaconeis undulata | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 192, pl. 133 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Paraplaconeis vernalis | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 192, pl. 134 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| PLACONEIS | Mereschkowsky | Bot. Zap. [Scr. Bot. Horti Univ. Imp. Petrop.] | 21: 45, 142 | 1903 |
| PLACONEIS | Mereschkowsky | Beih. Bot. Centralbl. | 15: 3 | 1903 |
| Placoneis abiskoensis | (Hustedt) H. Lange-Bertalot & D. Metzeltin apud D. Metzeltin & A. Witkowski in H. Lange-Bertalot (ed.) | Iconographia diatomologica | 4: expl. pl. 6: figs. 1-6 | 1996 |
| Placoneis abundans | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 166, pl. 73: figs. 1-14; pl. 77: figs. 1-3A | 2005 |
| Placoneis abundans var. australis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 192, pl. 137 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis abundans var. baicalensis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 192, pl. 138 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis abyssalis | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 192, pl. 139 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis acuta | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 140 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis amoena | D. Metzeltin, M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 224, pl. 124: fig. 1 | 2012 |
| Placoneis amphibola | (Cleve) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 72 | 2003 |
| Placoneis amphiboliformis | (D. Metzeltin, H. Lange-Bertalot & N. Soninkhishig) V.S. Vishnyakov in Vishnyakov et al. | Bot. Zhurn. | 101: 1302 | 2016 |
| Placoneis anglica | (Ralfs) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 64 | 2003 |
| Placoneis anglophila | (H. Lange-Bertalot) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 168 | 2005 |
| Placoneis anglophila var. signata | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 169 | 2005 |
| Placoneis antediluviana_('antediluvianum') | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 169 | 2005 |
| Placoneis apicalicostata | D. Metzeltin & H. Lange-Bertalot | Iconogr. Diatomol. | 11: 53, pl. 30 | 2003 |
| Placoneis argentata | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 141 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis asymmetrica_('asymmetricus') | A. Glushchenko, E. Kezlya, M. Kulikovskiy & J.P. Kociolek in Kezlya et al. | Cryptogamie, Algologie | 43: 180, figs. 2-4 | 2022 |
| Placoneis attenuata | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 142 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis australis | B. Van de Vijver & R. Zidarova in R. Zidarova, B. Van de Vijver, G. Mataloni, K. Kopalová, & L. Nedbalová | Cryptogamie: Algol. | 30: 301, figs. 44-58, 62-64 | 2009 |
| Placoneis balcanica | (Hustedt) H. Lange-Bertalot, D. Metzeltin & Z. Levkov in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 170 | 2005 |
| Placoneis betulina | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 143 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis bicapitata | Heinzerling | image | ||
| Placoneis bicuneus | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 170, pl. 71: figs. 1-7; pl. 76: fig. 1 | 2005 |
| Placoneis bona | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 144 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis boris-skvortzowii | D. Metzeltin, M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 225, pl. 132: figs. 17, 18 | 2012 |
| Placoneis bukhchuluuniae_('bukhchuluunae') | D. Metzeltin, H. Lange-Bertalot & N. Soninkhishig | Iconogr. Diatomol. | 20: 81, pl. 55: figs. 7-13 | 2009 |
| Placoneis cattiensis | A. Glushchenko, E. Kezlya, A. Kulikovskiy & J.P. Kociolek in Kezlya et al. | Phytotaxa | 460: 241, figs. 3-28 | 2020 |
| Placoneis centropunctata | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 195 | 1998 |
| Placoneis chilensis | H. Lange-Bertalot & U. Rumrich in U. Rumrich, H. Lange-Bertalot, & M. Rumrich | Iconogr. Diatomol. | 9: 206, pl. 59: figs. 8, 9 | 2000 |
| Placoneis clementioides | (Hustedt) E.J. Cox | image | ||
| Placoneis clementis | (Grunow) E.J. Cox | image | ||
| Placoneis clementis var. nipponica | (Skvortzov) T. Ohtsuka in T. Ohtsuka & A. Tuji | Phycol. Res. | 50: 249 | 2002 |
| Placoneis clementispronina | H. Lange-Bertalot & A.Z. Wojtal | Beih. Nova Hedwigia | 143: 405, 5-13, 77-79 | 2014 |
| Placoneis cocquytiae | C.A.K. Fofana, E.H. Sow, J. Taylor, L. Ector & B. Van de Vijver | Phytotaxa | 161: 140, figs. 1-10 | 2014 |
| Placoneis coloradensis | J.P. Kociolek & E.W. Thomas | Nova Hedwigia | 90: 205, figs. 48-51, 57-62 | 2010 |
| Placoneis composita | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 145 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis constans | (Hustedt) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 73 | 2003 |
| Placoneis constans var. symmetrica | (Hustedt) H. Kobayasi in S. Mayama, M. Idei, K. Osada, & T. Nagumo | Diatom | 18: 89 | 2002 |
| Placoneis conveniens | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 195 | 1998 |
| Placoneis coxiae_('coxia') | J.P. Kociolek & E.W. Thomas | Nova Hedwigia | 90: 200, figs. 23-29, 36-38 | 2010 |
| Placoneis cruciata | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193, pl. 146 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis cuneata | (Max Møller ex Foged) M. Potapova | Beih. Nova Hedwigia | 143: 99 | 2014 |
| Placoneis dacostae | D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 196, pl. 77: fig. 1; pl. 90: figs. 4-8 | 1998 |
| Placoneis dahurica | (Skvortzov) G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 193 | 2019 |
| Placoneis demeraroides | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 196 | 1998 |
| Placoneis densa | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 173 | 2005 |
| Placoneis diaphana | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 148 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis dicephala | (Ehrenberg) Mereschkowsky | image | ||
| Placoneis dicephala f. parva | Mereschkowsky | image | ||
| Placoneis dicephala var. elginensis | (Gregory) Mereschkowsky | image | ||
| Placoneis dicephala var. subcapitata | (Grunow) Mereschkowsky | image | ||
| Placoneis disparilis | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 197 | 1998 |
| Placoneis distincta | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 149 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis edlundii | V.S. Vishnyakov in Vishnyakov et al. | Bot. Zhurn. | 101: 1302, pl. I: figs. 13-25, pl. II: fig. 7 | 2016 |
| Placoneis elegans | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 174, pl. 75: figs. 1-9; pl. 75: fig. 10 | 2005 |
| Placoneis elegantula | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 175, pl. 74: figs. 1-10 | 2005 |
| Placoneis elenae | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 150 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis elenae var. undata | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 151 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis elginensis | (Gregory) E.J. Cox | image | ||
| Placoneis elginensis f. exigua | (Gregory) L.N. Bukhtiyarova | Algologia | 5: 419 | 1995 |
| Placoneis elginensis var. exigua | (Gregory) P.M. Tsarenko in P.M. Tsarenko et al. (eds.) | Algae of Ukraine | 2: 131 | 2009 |
| Placoneis elginensis var. neglecta | H. Kobayasi in S. Mayama, M. Idei, K. Osada, & T. Nagumo | Diatom | 18: 90 | 2002 |
| Placoneis elginensis var. undulata | (Østrup) H. Lange-Bertalot apud H. Lange-Bertalot et al. in H. Lange-Bertalot (ed.) | Icon. Diat. | 3: 133 | 1996 |
| Placoneis elliptica | (Hustedt) T. Ohtsuka | Diatom | 18: 44 | 2002 |
| Placoneis ellipticorostrata | D. Metzeltin, H. Lange-Bertalot & N. Soninkhishig | Iconogr. Diatomol. | 20: 82, pl. 53: figs. 1-5 | 2009 |
| Placoneis eugeniae | T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 152 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis exigua | (Gregory) Mereschkowsky | image | ||
| Placoneis exiguiformis | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 178 | 2005 |
| Placoneis exiguoides | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, | Iconogr. Diatomol. | 15: 179 | 2005 |
| Placoneis explanata | (Hustedt) S. Mayama in S. Mayama & A. Kawashima | Diatom | 14: 69 | 1998 |
| Placoneis extraordinaris | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 153 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis flabellata | (F. Meister) Kimura, H. Fukushima & Ts. Ko-Bayashi | Bunrui | 15: 134 | 2015 |
| Placoneis fourtanierae_('fourtanierae') | J.P. Kociolek & E.W. Thomas | Nova Hedwigia | 90: 204, figs. 42-47, 52-56 | 2010 |
| Placoneis gastriformis | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 178 | 2005 |
| Placoneis gastrum | (Ehrenberg) Mereschkowsky | Beih. Bot. Centralbl. | 15: 13 | 1903 |
| Placoneis gastrum f. nipponica | (Skvortzov) T. Ohtsuka & Y. Fujita | Nova Hedwigia | 73: 107 | 2001 |
| Placoneis gastrum var. boryana | (Pantocsek) Mereschkowsky | image | ||
| Placoneis gastrum var. exigua | (Gregory) Mereschkowsky | image | ||
| Placoneis gastrum var. jenisseyensis | (Grunow) Mereschkowsky | image | ||
| Placoneis gastrum var. latiuscula | (Grunow) Mereschkowsky | Beih. Bot. Centralbl. | 15: 14 | 1903 |
| Placoneis geitleri | (Hustedt) V.S. Vishnyakov in Vishnyakov et al. | Bot. Zhurn. | 101: 1304 | 2016 |
| Placoneis gelegma | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 226, pl. 132: figs. 19-21 | 2012 |
| Placoneis gelegma var. baicalensis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 155 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis gracilis | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 180, pl. 73: figs. 15-17; pl. 76: fig. 3 | 2005 |
| Placoneis gracilis f. minor | (É. Manguin) D. Metzeltin & H. Lange-Bertalot | Iconogr. Diatomol. | 18: 233 | 2007 |
| Placoneis granum | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 194, pl. 156 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis grata | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 157 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis habita | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, | Iconogr. Diatomol. | 15: 181 | 2005 |
| Placoneis hambergii | (Hustedt) K. Bruder in K. Bruder & L.K. Medlin | Nova Hedwigia | 85: 349 | 2007 |
| Placoneis heufleriana | (Grunow) Mereschkowsky | Beih. Bot. Centralbl. | 15: 24 | 1903 |
| Placoneis humilis | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 182, pl. 74: figs. 11-19; pl. 76: fig. 4 | 2005 |
| Placoneis ignita | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 158 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis ignorata | (H. Schimanski) H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot, & M. Rumrich | Iconogr. Diatomol. | 9: 207 | 2000 |
| Placoneis incerta | V.S. Vishnyakov in Vishnyakov et al. | Bot. Zhurn. | 101: 1304 | 2016 |
| Placoneis inexplorata | (Krasske) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, | Iconogr. Diatomol. | 15: 183 | 2005 |
| Placoneis insignita | (Hustedt) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 74 | 2003 |
| Placoneis insularis | T.A. Sherbakova & G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 159 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis integra | (W. Sm.) Mereschkowsky | image | ||
| Placoneis integra | (W. Smith) Mereschkowsky | Beih. Bot. Centralbl. | 15: 17 | 1903 |
| Placoneis interglacialis | (Hustedt) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 74 | 2003 |
| Placoneis itamoemae | A. Straube, P.I. Tremarin & T.A.V. Ludwig in Straube et al. | Phytotaxa | 76: 56, figs. 1-24 | 2013 |
| Placoneis ivanii | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 160 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis izhboldinae | V.S. Vishnyakov in Vishnyakov et al. | Bot. Zhurn. | 101: 1301, pl. I: figs. 1-8, pl. II: figs. 1-6 | 2016 |
| Placoneis jatobensis | (Krasske) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 197 | 1998 |
| Placoneis jatobensis var. capitata | (Krasske) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 197 | 1998 |
| Placoneis juriljii | A. Miho & H. Lange-Bertalot | Proc. Int. Diatom Symp. | 18: 306, figs. 27-35 | 2006 |
| Placoneis lata | (M. Peragallo) R. Lowe in J.R. Johansen et al. | Arch. Hydrobiol. Suppl. | 150 (Algol. Stud. 111): 24 | 2004 |
| Placoneis laticuneata | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 227, pl. 125: figs. 1-3 | 2012 |
| Placoneis likhoshwayae | D. Metzeltin, M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 227, pl. 132: figs. 1 | 2012 |
| Placoneis linearis | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 161 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis lucinensis | H. Lange-Bertalot in Hofmann, Werum, & Lange-Bertalot | Diatomeen im Süsswasser-Benthos von Mitteleuropa: | 501, pl. 47: 15-19 | 2011 |
| Placoneis ludmilae | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 162 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis lundstroemii | (Cleve) Mereschkowsky | image | ||
| Placoneis lundstroemii var. frieseana | (Grunow) Mereschkowsky | image | ||
| Placoneis macedonica | Z. Levkov & D. Metzeltin in Levkov, Krstic, Metzeltin & Nakov | Icon. Diatomol. | 16: 110, pl. 98, pl. 99: figs. 20-23 | 2007 |
| Placoneis maculata | (Hustedt) Z. Levkov in Levkov, Krstic, Metzeltin & Nakov | Icon. Diatomol. | 16: 111 | 2007 |
| Placoneis madagascariensis | H. Lange-Bertalot & D. Metzeltin in D. Metzeltin & H. Lange-Bertalot | Iconogr. Diatomol. | 11: 54, pl. 27: figs. 37-40; pl. 28: fig. 4 | 2003 |
| Placoneis magna | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 195, pl. 163 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis maior | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 228, pl. 124: figs. 4-7 | 2012 |
| Placoneis margaritae_('margarita') | M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 229, pl. 128: figs. 1-14; pl. 129: figs. 1, 2; pl. 130: figs. 1, 2 | 2012 |
| Placoneis merinensis | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 183, pl. 72: figs. 7-10; pl. 72: fig. 11 | 2005 |
| Placoneis minor | (Grunow) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 183 | 2005 |
| Placoneis mira | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 165 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis miseranda | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 230, pl. 125: figs. 10, 11; pl. 132: figs. 13-15 | 2012 |
| Placoneis modaomensis | Yan-Ling Li in Li et al. | Acta Botanica Croatica | 82: 88, figs. 1-3 | 2023 |
| Placoneis molesta | D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 197, pl. 89: figs. 6-9 | 1998 |
| Placoneis molestissima | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 186, pl. 70: figs. 14-21; pl. 77: figs. 4, 4A | 2005 |
| Placoneis mollis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 167 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis mologaensis | V.S. Vishnyakov | Phytotaxa | 464: 219, figs. 1-26 | 2020 |
| Placoneis mutica | (Kützing) Mereschkowsky | image | ||
| Placoneis mutica var. goeppertiana | (Bleisch) Mereschkowsky | image | ||
| Placoneis mutica var. legumen | (Cleve) Mereschkowsky | image | ||
| Placoneis mutica var. peguana | (Grunow) Mereschkowsky | image | ||
| Placoneis mutica var. producta | (Grunow) Mereschkowsky | image | ||
| Placoneis mutica var. undulata | (Hilse) Mereschkowsky | image | ||
| Placoneis mutica var. ventricosa | (Kützing) Mereschkowsky | image | ||
| Placoneis nanoclementis | H. Lange-Bertalot & A.Z. Wojtal | Beih. Nova Hedwigia | 143: 407, figs. 14-28, 71-73 | 2014 |
| Placoneis navicula | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 168 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis navicularis | (Ehrenberg) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 71 | 2003 |
| Placoneis neglecta | A. Tuji | Bull. Natl. Sci. Mus [Tokyo], Ser. B (Bot.), | 29: 71 | 2003 |
| Placoneis neglecta | R. Lowe in J.R. Johansen et al. | Arch. Hydrobiol. Suppl. | 150 (Algol. Stud. 111): 24 | 2004 |
| Placoneis neoexigua | Lange-Bertalot, & Miho in A. Miho & H. Lange-Bertalot | Proc. Int. Diatom Symp. | 18: 302, figs. 1-11, 20-26 | 2006 |
| Placoneis neotropica | D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 198, pl. 89: figs. 1-5 | 1998 |
| Placoneis obtuseprotracta | (Hustedt) Y. Li & D. Metzeltin in Gong et al. | Phytotaxa | 150: 38 | 2013 |
| Placoneis ohridana | Z. Levkov & D. Metzeltin in Levkov, Krstic, Metzeltin & Nakov | Icon. Diatomol. | 16: 111, pl. 97 | 2007 |
| Placoneis ovillus | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 187, pl. 74: figs. 20-26 | 2005 |
| Placoneis paraelginensis | H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot, & M. Rumrich | Iconogr. Diatomol. | 9: 208, pl. 60: figs. 17-20 | 2000 |
| Placoneis paragelegma | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 169 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis paraundulata | T. Ohtsuka | Diatom | 18: 47 | 2002 |
| Placoneis parazula | M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 231, pl. 131: figs. 14-17 | 2012 |
| Placoneis parunculus | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 189 | 2005 |
| Placoneis parvapolonica | H. Lange-Bertalot & A.Z. Wojtal | Beih. Nova Hedwigia | 143: 408, figs. 29-44, 74-76 | 2014 |
| Placoneis parvula | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 171 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis patagonica | N.I. Maidana in Maidana et al. | Beih. Nova Hedwigia | 146: 98, figs. 21-40 | 2018 |
| Placoneis paucimarensis | E.V. Rodionova & G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 172 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis pellaifa | H. Lange-Bertalot & U. Rumrich in U. Rumrich, H. Lange-Bertalot, & M. Rumrich | Iconogr. Diatomol. | 9: 210, pl. 60: figs. 9, 10 | 2000 |
| Placoneis perelginensis | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 189, pl. 70: figs. 6-13 | 2005 |
| Placoneis placentula | (Ehrenberg) Mereschkowsky | image | ||
| Placoneis placentula f. lanceolata | (Grunow) L.N. Bukhtiyarova | Algologia | 5: 419 | 1995 |
| Placoneis placentula f. latiuscula | (Grunow) L.N. Bukhtiyarova | Algologia | 5: 420 | 1995 |
| Placoneis placentula f. rostrata | (Mayer) L.N. Bukhtiyarova | Algologia | 5: 420 | 1995 |
| Placoneis placentula var. jenisseyensis | (Grunow) L.N. Bukhtiyarova | Algologia | 5: 419 | 1995 |
| Placoneis placentula var. lanceolata | (Grunow) M. Aboal in A. Witkowski (ed.), | Diat. Monogr. | 4: 424 | 2003 |
| Placoneis placentula var. lanceolata | (Grunow) P.M. Tsarenko in P.M. Tsarenko et al. (eds.), | Algae of Ukraine | 2: 132 | 2009 |
| Placoneis placentula var. latiuscula | (Grunow) P.M. Tsarenko in P.M. Tsarenko et al. (eds.) | Algae of Ukraine | 2: 132 | 2009 |
| Placoneis placentula var. rostrata | (Mayer) N.A. Andresen, E.F. Stoermer, & R.G. Kreis, Jr. | Diatom Research | 15: 415 | 2000 |
| Placoneis porifera | (Hustedt) T. Ohtsuka & Y. Fujita | Nova Hedwigia | 73: 107 | 2001 |
| Placoneis porifera var. opportuna | (Hustedt) E. Novelo, R. Tavera, & C. Ibarra | Bibliotheca Diatomol. | 54: 53 | 2007 |
| Placoneis prespanensis | Z. Levkov, S. Krstic & T. Nakov in Levkov, Krstic, Metzeltin & Nakov, | Icon. Diatomol. | 16: 113, pl. 99: figs. 1-17, pl. 100 | 2007 |
| Placoneis protracta | (Grunow) Mereschkowsky | image | ||
| Placoneis protracta var. maxima | (Cleve) Mereschkowsky | image | ||
| Placoneis pseudabundans | Z. Levkov in Levkov & Williams | Phytotaxa | 30: 14, figs. 92-95 | 2011 |
| Placoneis pseudanglica | E.J. Cox | image | ||
| Placoneis pseudanglica | E.J. Cox | Diatom Res. | 2: 155 | 1988 |
| Placoneis pseudoclementis | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 192 | 2005 |
| Placoneis pseudodemerarae | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 199 | 1998 |
| Placoneis pseudolacustris | (A.P. Skabichevskij) M.S. Kulikovskiy, H. Lange-Bertalot & G.K. Khursevich | Nova Hedwigia | 100: 219 | 2014 |
| Placoneis pseudolacustris f. apiculata | (A.P. Skabichevskij) M.S. Kulikovskiy, H. Lange-Bertalot & G.K. Khursevich | Nova Hedwigia | 100: 221 | 2014 |
| Placoneis pseudoporifera | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 192 | 2005 |
| Placoneis radialis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 173 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis radialis var. producta | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 174 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis regionalis | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 197, pl. 175 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis reimeri | J.P. Kociolek & E.W. Thomas | Nova Hedwigia | 90: 201, figs. 30-35, 39-41 | 2010 |
| Placoneis reversa | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 193 | 2005 |
| Placoneis rhombea | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 197, pl. 176 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis rhombelliptica | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 193, pl. 71: figs. 16-23; pl. 76: fig. 2 | 2005 |
| Placoneis rhombica | (Brockmann) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 195 | 2005 |
| Placoneis rostrata | (Ant. Mayer) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 67 | 2003 |
| Placoneis ruppeliana | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 232, pl. 125: figs. 4-9; pl. 126: figs. 1, 2; pl. 127: figs. 1-3 | 2012 |
| Placoneis santaremensis | D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 199, pl. 75: figs. 18-24 | 1998 |
| Placoneis scharfii | H. Lange-Bertalot & U. Rumrich in U. Rumrich, H. Lange-Bertalot, & M. Rumrich | Iconogr. Diatomol. | 9: 211, pl. 59: figs. 5-7 | 2000 |
| Placoneis septentrionalis | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 196, pl. 178 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis serena | (Frenguelli) D. Metzeltin in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 195 | 2005 |
| Placoneis signata | S. Mayama in S. Mayama & A. Kawashima | Diatom | 14: 70 | 1998 |
| Placoneis signatoides | D. Metzeltin & Z. Levkov in Levkov, Krstic, Metzeltin & Nakov | Icon. Diatomol. | 16: 114, pl. 90: figs. 2-9 | 2007 |
| Placoneis significans | H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 196 | 2005 |
| Placoneis simplex | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 197, pl. 179 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis sinensis | Y. Li & D. Metzeltin in Gong et al. | Phytotaxa | 150: 34, figs. 40-43 | 2013 |
| Placoneis solaris | G.V. Pomazkina, E.V. Rodionova & T.A. Sherbakova | Limnol. Freshw. Biol. | 2019: 197, pl. 180 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis sovereigniae_('sovereignae') | (Hustedt) L.C. Torgan & L. Donadel | Iheringia, sér. Bot. | 65: 107 | 2010 |
| Placoneis spinosa | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 233, pl. 122: figs. 1-4; pl. 123: figs. 1, 2 | 2012 |
| Placoneis subclementis | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 196 | 2005 |
| Placoneis subelegans | Z. Levkov in Levkov & Williams | Phytotaxa | 30: 16, figs. 97-113 | 2011 |
| Placoneis subgastriformis | (Hustedt) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 74 | 2003 |
| Placoneis subinflata | (Grunow) Mereschkowsky | image | ||
| Placoneis subinflata var. elliptica | (Cleve) Mereschkowsky | image | ||
| Placoneis subplacentula | (Hustedt) E.J. Cox | Bot. J. Linn. Soc. [London] | 141: 73 | 2003 |
| Placoneis subsalsa | Mereschkowsky | image | ||
| Placoneis subsalsa var. minuta | (Grunow) Mereschkowsky | image | ||
| Placoneis subsalsa var. obtusata | (Grunow) Mereschkowsky | image | ||
| Placoneis subtilis | M.S. Kulikovskiy & H. Lange-Bertalot in Metzeltin et al. | Iconogr. Diatomol. | 23: 234, pl. 131: figs. 23-28; pl. 134: figs. 6 | 2012 |
| Placoneis surinamensis | (Cleve) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 200 | 1998 |
| Placoneis symmetrica | (Hustedt) H. Lange-Bertalot in D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 197 | 2005 |
| Placoneis tersa | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 200 | 1998 |
| Placoneis tsendeekhuui | D. Metzeltin, H. Lange-Bertalot & N. Soninkhishig | Iconogr. Diatomol. | 20: 83, pl. 55: figs. 1-6 | 2009 |
| Placoneis tumidula | Z. Levkov in Levkov, Krstic, Metzeltin & Nakov, | Icon. Diatomol. | 16: 115, pl. 91: figs. 11-15, pl. 92: figs. 4-10, pl. 93: fig. 1 | 2007 |
| Placoneis undulata | (Østrup) T. Ohtsuka & Y. Fujita | Nova Hedwigia | 73: 107 | 2001 |
| Placoneis uruguayensis | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 197, pl. 78 | 2005 |
| Placoneis vadosa | G.V. Pomazkina & E.V. Rodionova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 197, pl. 181 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis vicina | (Hustedt) D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 201 | 1998 |
| Placoneis vladimirii var. diminuta | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 198, pl. 183 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis vladimirii_('vladimiri') | G.V. Pomazkina in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 197, pl. 182 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis waernensis | (Foged) H. Lange-Bertalot & D. Metzeltin in D. Metzeltin, H. Lange-Bertalot & N. Soninkhishig | Iconogr. Diatomol. | 20: 84 | 2009 |
| Placoneis witkowskii | D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez | Iconogr. Diatomol. | 15: 200, pl. 71: figs. 8-15 | 2005 |
| Placoneis witkowskii var. baicalensis | G.V. Pomazkina & T.A. Sherbakova in Pomazkina, Rodionova, & Sherbakova | Limnol. Freshw. Biol. | 2019: 198, pl. 184 in Pomazkina et al., Benthic diatom algae of the family Naviculaceae of Lake Baikal (2018) | 2019 |
| Placoneis yucatanensis | D. Metzeltin & H. Lange-Bertalot | Iconogr. Diatomol. | 18: 233, pl. 144: figs. 7-11 | 2007 |
| Placoneis zimmermannii | D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 201, pl. 89: figs. 10-13 | 1998 |
| Placoneis zula | M.S. Kulikovskiy, H. Lange-Bertalot & D. Metzeltin in Metzeltin et al. | Iconogr. Diatomol. | 23: 235, pl. 131: figs. 1-13 | 2012 |
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