| Name | Author | Source | Citation | Year |
|---|
| Asteromonas phacus | Pascher | image |
| Characiopsis microcysticola f. phacuscola | J.A. Rino | Revista Ci. Biol., Fac. Ci. Univ. Lourenc\*,o Marques, A, | 5: 177, pl. X: figs. 12-14 | 1972 |
| CHLAMYDOPHACUS | J. Massart | image |
| Chlamydophacus compressus | J. Massart | image |
| CHLOROPHACUS | Pochmann | image |
| Diplostauron phacus | Skvortzov | image |
| EUPHACUS | Lemmermann | image |
| HYALOPHACUS | E.G. Pringsheim | image |
| Hyalophacus caecus | H.R. Christen | image |
| Hyalophacus klebsii | E.G. Pringsheim | image |
| Hyalophacus ocellatus var. major | E.G. Pringsheim | image |
| Hyalophacus ocellatus var. minor | E.G. Pringsheim | image |
| Hyalophacus ocellatus_('ocellata') | E.G. Pringsheim | image |
| Hyalophacus ocellatus_(`ocellata') | E.G. Pringsheim | Arch. Protistenk. | 87: 73, fig. 9 | 1936 |
| Hyalophacus pleuronectes | (O.F. Müller) E.G. Pringsheim | image |
| Hyalophacus pleuronectes | (O.F. Mueller) E.G. Pringsheim | Farblose Algen: | 58 | 1963 |
| Hyalophacus pleuronectes f. hyalinus | (G.A. Klebs) E.G. Pringsheim | image |
| Hyalophacus tiszae | T. Hortobágyi | image |
| MIKROPHACUS | Kiss | image |
| PHACUS | Dujardin | image |
| PHACUS | Nitzsch | image |
| PHACUS sect. | DOLICHOPLASTES Huber-Pestalozzi | image |
| PHACUS sect. | MIKROPHACUS Kiss | image |
| PHACUS subg. | CHLOROPHACUS Pochmann | image |
| PHACUS subg. | EUPHACUS Lemmermann | image |
| Phacus abrupta | Korshikov | image |
| Phacus acuminatus f. brevicaudata | Kiss | image |
| Phacus acuminatus f. depressa | Kiss | image |
| Phacus acuminatus | Stokes | image |
| Phacus acuminatus subsp. acuticauda | (Roll) Pochmann | image |
| Phacus acuminatus subsp. americana | Pochmann | image |
| Phacus acuminatus subsp. disciferus_('discifera') | Pochmann | image |
| Phacus acuminatus subsp. granulata | (Roll) Pochmann | image |
| Phacus acuminatus subsp. indica | Pochmann | image |
| Phacus acuminatus subsp. javana | Pochmann | image |
| Phacus acuminatus subsp. megapyrenoidea | (Roll) Pochmann | image |
| Phacus acuminatus subsp. triquetrus_('triquetra') | (Skvortzov) Pochmann | image |
| Phacus acuminatus var. acuticauda | (Roll) Huber-Pestalozzi | image |
| Phacus acuminatus var. alpinus | Bourrelly | image |
| Phacus acuminatus var. americanus | (Pochmann) Xavier | image |
| Phacus acuminatus var. angustus_('angusta') | T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 57, pl. II: fig. 13 | 1947 |
| Phacus acuminatus var. barrackporensis | Philipose | image |
| Phacus acuminatus var. brasiliensis | V. Conforti | Rev. Hydrobiol. Trop. | 27: 10, pl. IV: figs. 4a,b | 1995 |
| Phacus acuminatus var. cordiformis_('cordiforme') | Tell & Y. Zalocar de Domitrovic | image |
| Phacus acuminatus var. disciferus_('discifera') | (Pochmann) Huber-Pestalozzi | image |
| Phacus acuminatus var. drezepolskii | Skvortzov | image |
| Phacus acuminatus var. globulus | Dedusenko-Shchegoleva | image |
| Phacus acuminatus var. granulata | (Roll) Huber-Pestalozzi | image |
| Phacus acuminatus var. indica | (Pochmann) Huber-Pestalozzi | image |
| Phacus acuminatus var. iowensis | Allegre & Jahn | image |
| Phacus acuminatus var. janei | Suxena | image |
| Phacus acuminatus var. javana | (Pochmann) Huber-Pestalozzi | image |
| Phacus acuminatus var. megaparamylica | Huber-Pestalozzi | image |
| Phacus acuminatus var. minima | Martinez | image |
| Phacus acuminatus var. minor | Kiselev | image |
| Phacus acuminatus var. triangulatus | (Roll) Svirenko | image |
| Phacus acuminatus var. triqueter | Skvortzov | image |
| Phacus acuminatus var. triqueter | Z.X. Shi | Acta Hydrobiol. Sin. | 11: 358, 364, fig. 1 i-k | 1987 |
| Phacus acuticauda | Roll | image |
| Phacus acuticauda | Y.V. Roll | Russ. Arkh. Protist. | 4: 140, 148, pl. V: fig. 17 | 1925 |
| Phacus acutissimus | Bernard | image |
| Phacus acutus | Pochmann | image |
| Phacus aenigmatica | Drezepolski | image |
| Phacus aenigmatica | Drezepolski | image |
| Phacus aenigmatica f. filicauda | Conrad | image |
| Phacus aenigmatica var. asiatica | Skvortzov | image |
| Phacus aenigmaticus f. filicauda | Conrad | Bull. Mus. Roy. Hist. Nat. Belgique | 14{8}: 6, figs. 15-17 | 1938 |
| Phacus aenigmaticus var. monochloron | Pochmann | Arch. Protistenk. | 95: 137, figs. 24, 25 | 1942 |
| Phacus aenigmaticus_('aenigmatica') | Drezepolski | Rozpr. i Wiadom. Muz. Dzieduszyckich [Lwów] | 7/8: 4, 14, pl. I: figs. 4, 4a | 1923 |
| Phacus agilis | Skuja | Acta Hort. Bot. Univ. Latv. | 1: 39, fig. 2:4 | 1926 |
| Phacus agilis var. inversa | P. Bourrelly | image |
| Phacus agilis var. okobojiensis | Allegre & Jahn | image |
| Phacus alatus var. incrassata | Deflandre | image |
| Phacus alatus var. indica | Skvortzov | image |
| Phacus alatus var. latviensis | Skvortzov | image |
| Phacus alatus var. lemmermannii | Svirenko | image |
| Phacus alatus var. maior | Drezepolski | image |
| Phacus alatus var. maximus | Hübner | image |
| Phacus alatus var. maximus_('maxima') | Hübner | Euglenac.-Fl. Stralsund [Programm Realgymn. Stralsund]: | 6, fig. 8 | 1886 |
| Phacus alatus_('alata') | Klebs | image |
| Phacus allorgei | Bourrelly | image |
| Phacus anacoelus f. major | Prescott | image |
| Phacus anacoelus f. minor | Huber-Pestalozzi | image |
| Phacus anacoelus f. multiundulata | Halász | image |
| Phacus anacoelus | Stokes | image |
| Phacus anacoelus var. asiatica | Skvortzov | image |
| Phacus anacoelus var. subundulata | Skvortzov | image |
| Phacus anacoelus var. undulata | (Skvortzov) Skvortzov | image |
| Phacus angulatus | Pochmann | image |
| Phacus angustatus | V. Conforti | Nova Hedwigia | 53: 81, pl. III: fig. 15 | 1991 |
| Phacus ankylonoton | Pochmann | image |
| Phacus anomalus f. subsalsus | Y. J. Ling, Z. Li & G. Z. Deng | Acta Phytotax. Sinica | 29: 380, fig. 4-6 | 1991 |
| Phacus anomalus var. major | Y.J. Ling, Z. Li & G.Z. Deng | Acta Phytotax. Sinica | 29: 380, fig. 1-3 | 1991 |
| Phacus anomalus var. pullus-gallinae | Nygaard | image |
| Phacus anomalus_('anomala') | Fritsch & Rich | image |
| Phacus applanatus | Pochmann | image |
| Phacus argentiniensis | V. Conforti | Nova Hedwigia | 53: 81, pl. IV: fig. 27 | 1991 |
| Phacus arnoldii | Svirenko | Arch. Hydrobiol. u. Planktonk. | 10: 336, pl. V: fig. 1 | 1915 |
| Phacus arnoldii var. ovatus | Popova | image |
| Phacus arnoldii var. ovatus_('ovata') | T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 57, pl. II: fig. 12 | 1947 |
| Phacus asimmetricus | Sokoloff | image |
| Phacus aspidion | Pochmann | image |
| Phacus asymmetricus_('asymmetrica') | Prescott | image |
| Phacus atraktoides | Pochmann | Arch. Protistenk. | 95: 219, fig. 133 | 1942 |
| Phacus bacillifer | Da Cunha | image |
| Phacus bacilliformis | Z.X. Shi | Acta Phytotax. Sin. | 34: 105, fig. 1: 4-8 | 1996 |
| Phacus balatonicus | Hortobágyi | image |
| Phacus balatonicus var. boglariensis | Hortobágyi | image |
| Phacus balatonicus var. major | Philipose | image |
| Phacus balatonicus var. minor | V. Conforti | Rev. Hydrobiol. Trop. | 27: 10, pl. III: figs. 13a,b | 1995 |
| Phacus balechii | V. Conforti | Nova Hedwigia | 53: 83, pl. III: fig. 16 | 1991 |
| Phacus berthonii | Bourrelly | image |
| Phacus berthonii var. gracilis | Bourrelly | image |
| Phacus berthonii var. simplex | Bourrelly | image |
| Phacus betkowskii | Stawinski | image |
| Phacus bharatii | Hosmani | image |
| Phacus bicalyx | Hortobágyi | image |
| Phacus biformis | Hortobágyi | image |
| Phacus bifurcatus | Uhercovich in Uherkovich & Lantos | Limnologica (Berlin) | 18(1): 29-67 | 1987 |
| Phacus birgei | Prescott | image |
| Phacus bonaerensis | V. Conforti | Cryptog.: Algol. | 10: 71, fig. 1 | 1989 |
| Phacus bonettoi | G. Tell & Y. Zalocar de Domitrovic | Nova Hedwigia | 41: 358, pl. III: fig. 6 | 1985 |
| Phacus bonettoi | Tell & Y. Zalocar de Domitrovic | image |
| Phacus brachykentron | Pochmann | image |
| Phacus brachykentron var. caudatus | Prescott | image |
| Phacus brachykentron var. pauschenensis | Bourrelly | image |
| Phacus brevicaudata | (G.A. Klebs) Lemmermann | image |
| Phacus brevicaudata | (Klebs) Lemmermann | image |
| Phacus brevicaudatus var. variabilis | Lemmermann | image |
| Phacus brevisulca | J.I. Kim & W. Shin | J. Phycol. | 50: 955, fig. 2B | 2014 |
| Phacus bucculentus | Pochmann | image |
| Phacus bucharica | Kiselev | image |
| Phacus budapestinensis | Palik | image |
| Phacus buzsakiensis_('buzsákiensis') | Hortobágyi | image |
| Phacus canae | Skvortzov | image |
| Phacus carinatus | Conrad | image |
| Phacus carinatus | Pochmann | image |
| Phacus carinatus_('carinata') | Skvortzov | image |
| Phacus caudatus | Hübner | image |
| Phacus caudatus var. conradianus | Palik | image |
| Phacus caudatus var. conradii | Bourrelly | image |
| Phacus caudatus var. lata | Allorge & Lefčvre | image |
| Phacus caudatus var. latus_('lata') | Allorge & Lefèvre | Bull. Soc. Bot. France | 72(Sess. Extr.): 126, figs. 18-21 | 1931 |
| Phacus caudatus var. major | Philipose | image |
| Phacus caudatus var. minor | Drezepolski | image |
| Phacus caudatus var. ovalis | Drezepolski | image |
| Phacus caudatus var. polonica | Drezepolski | image |
| Phacus caudatus var. spiralis | Hortobágyi | image |
| Phacus caudatus var. tenuis | Svirenko | image |
| Phacus caudatus var. volicensis | Drezepolski | image |
| Phacus caudatus_('caudata') | Hübner | Euglenac.-Fl. Stralsund [Programm Realgymn. Stralsund]: | 5, fig. 5 | 1886 |
| Phacus chloroplastes f. incisa | Prescott | image |
| Phacus chloroplastes | Prescott | image |
| Phacus circulatus | Pochmann | Arch. Protistenk. | 95: 177, fig. 77 | 1942 |
| Phacus circulatus_('circulata') | Skvortzov | image |
| Phacus circumflexus | Pochmann | image |
| Phacus clavata | Dangeard | image |
| Phacus claviformis | J.I. Kim & W. Shin | J. Phycol. | 50: 955, fig. 2E | 2014 |
| Phacus cochleatus | Pochmann | Arch. Protistenk. | 95: 232, fig. 151 | 1942 |
| Phacus concavus | Hortobágyi | image |
| Phacus contortus | Bourrelly | image |
| Phacus contortus f. minor | Bourrelly | image |
| Phacus contortus var. complicatus | Bourrelly | image |
| Phacus convexus | B. Zakryś & M. Łukomska in Łukomska-Kowalczyk et al. | J. Phycol. | 56: 1145 | 2020 |
| Phacus corculum | Pochmann | image |
| Phacus cordatus_('cordata') | (Pochmann) Zakryś & M. Łukomska in Łukomska et al. | J. Phycol. | 51: 1151 | 2015 |
| Phacus costata | Conrad | image |
| Phacus costatus_('costata') | Conrad | Ann. Biol. Lacustre | 7: 135, fig. 3 | 1914 |
| Phacus crassus | Zakryś & M. Łukomska in Łukomska et al. | J. Phycol. | 51: 1153, fig. 3p | 2015 |
| Phacus crenatus | Hirano | image |
| Phacus crenulatus var. annulatus_('annulata') | Taft | image |
| Phacus cristatus | Zakryś & M. Łukomska in Łukomska et al. | J. Phycol. | 51: 1153, fig. 3q | 2015 |
| Phacus cuneatus | Pochmann | image |
| Phacus curvicauda f. fissuratus_('fissurata') | Tell & Y. Zalocar de Domitrovic | image |
| Phacus curvicauda f. thracicus_('thracica') | I.K. Kirjakov | Arch. Hydrobiol. Suppl. | 123 (Algol. Stud. 88): 33, figs. 1-6 | 1998 |
| Phacus curvicauda | Svirenko | image |
| Phacus curvicauda | Svirenko | image |
| Phacus curvicauda var. minor | Lefčvre | image |
| Phacus curvicauda var. profundus | Z.X. Shi in Shi et al. | Flora Algarum Sinicarum Aquae Dulcis. Tomus VI. Euglenophyta: | 263, pl. LXIII: figs. 7, 8 | 1999 |
| Phacus curvicauda var. robusta | Allorge & Lefčvre | image |
| Phacus curvicauda var. sicyoideus | Z.X. Shi in Shi et al. | Flora Algarum Sinicarum Aquae Dulcis. Tomus VI. Euglenophyta: | 263, pl. LXIII: figs. 9-11 | 1999 |
| Phacus curvicauda var. undulata | Skvortzov | image |
| Phacus cylindraceus | T.G. Popova | Opred. Presnov. Vodor. SSSR | 7: 213 | 1955 |
| Phacus cylindrus | Pochmann | image |
| Phacus dangeardii | Lemmermann | image |
| Phacus dangeardii var. oblonga | (Skvortzov) Huber-Pestalozzi | image |
| Phacus denisii | Allorge & Lefčvre | image |
| Phacus dihistion | Conrad | image |
| Phacus drezepolskii | Stawinski | image |
| Phacus elegans | Pochmann | image |
| Phacus elegantissimus | Hortobágyi | image |
| Phacus elongatus | V. Conforti | Nova Hedwigia | 53: 84, pl. III: fig. 17 | 1991 |
| Phacus ephippioideus | C. Bicudo & D. Bicudo | Acta Bot. Bras. | 1: 45, figs. 4-6 | 1987 |
| Phacus ephippion | Pochmann | image |
| Phacus fernii | V. Conforti | Nova Hedwigia | 53: 84, pl. IV: fig. 24 | 1991 |
| Phacus filicauda | (Conrad) Pochmann | image |
| Phacus florii | V. Conforti | Nova Hedwigia | 53: 86, pl. V: fig. 29 | 1991 |
| Phacus fominii | Y.V. Roll | Symposium dedicated to the memory of A.V. Fomin: | 137, 142, fig. 1 | 1938 |
| Phacus formosus | Pochmann | image |
| Phacus formosus var. ovatus | Z.X. Shi in Shi et al. | Flora Algarum Sinicarum Aquae Dulcis. Tomus VI. Euglenophyta: | 263, pl. LXIV: figs. 10-12 | 1999 |
| Phacus gamsii | Bourrelly | image |
| Phacus gibbosus | Huber-Pestalozzi | image |
| Phacus gigas | Da Cunha | Mem. Inst. Oswaldo Cruz [Rio de Janeiro] | 5: 110, pl. 10: fig. 3 | 1913 |
| Phacus glaber | Pochmann | Arch. Protistenk. | 95: 236, fig. 160 | 1942 |
| Phacus globosus | Pochmann | Arch. Protistenk. | 95: 224, fig. 140 | 1942 |
| Phacus glomus | Hortobágyi | image |
| Phacus gracilis | Pochmann | image |
| Phacus granulatus var. laevis | Z.X. Shi | Acta Phytotax. Sin. | 34: 107, figs. 1: 1-3 | 1996 |
| Phacus granulatus_('granulata') | Roll | image |
| Phacus granum | Drezepolski | image |
| Phacus granum f. spinosus | Hortobágyi | image |
| Phacus gregussii | Hortobágyi | image |
| Phacus hamatus | Pochmann | image |
| Phacus hamelii | Allorge & Lefèvre | Bull. Soc. Bot. France | 72(Sess. Extr.): 128, figs. 55-57 | 1931 |
| Phacus hamelii | Allorge & Lefčvre | image |
| Phacus heimii | Lefčvre | image |
| Phacus heimii var. minor | Suxena | image |
| Phacus helicoideus | Bernard | Protococcacées et Desmidiées: | 206, fig. 563 | 1908 |
| Phacus helikoides | Pochmann | image |
| Phacus helikosphaeridion | Pochmann | image |
| Phacus hispidulus f. glaber | Deflandre | Ann. Protistol. | 3: 232, pl. XXI: figs. 15, 18-20 | 1932 |
| Phacus hispidulus f. glabra | Deflandre | image |
| Phacus hispidulus f. granulatus | Deflandre | Ann. Protistol. | 3: 232 | 1932 |
| Phacus hispidulus f. pomiformis | Conrad | image |
| Phacus hispidulus f. suecicus | (Lemmermann) Popova | image |
| Phacus hispidulus var. crassicauda | Palik | image |
| Phacus hispidulus var. crassicauda | Palik | image |
| Phacus hispidulus var. latus | (Roll) Deflandre | image |
| Phacus hispidulus var. steinii | Lemmermann | image |
| Phacus hispidulus var. strigosa | Deflandre | image |
| Phacus hispidulus_('hispidula') | (Eichwald) Klebs | image |
| Phacus hordeiformis | J.I. Kim & W. Shin | J. Phycol. | 50: 956, figs. 2F,G | 2014 |
| Phacus horridus | Pochmann | Arch. Protistenk. | 95: 239, fig. 163 | 1942 |
| Phacus horridus var. major | V. Conforti | Rev. Hydrobiol. Trop. | 27: 10, pl. IV: figs. 13, 17 | 1995 |
| Phacus hyalina | Skvortzov | image |
| Phacus hystrix | Pochmann | image |
| Phacus ichthydion | Pochmann | image |
| Phacus incisus | Prescott | image |
| Phacus inconspicua | Deflandre | image |
| Phacus inconspicuus f. angustus | Shi | image |
| Phacus inconspicuus_('inconspicua') | Deflandre | Bull. Mus. Natl. Hist. nat. [Paris] | 32: 421, no fig. | 1926 |
| Phacus incrassatus | (Deflandre) Pochmann | image |
| Phacus indicus var. boglariensis | Hortobágyi | image |
| Phacus indicus var. elegans | Bourrelly | image |
| Phacus indicus_('indica') | Skvortzov | image |
| Phacus inflata | Thompson | image |
| Phacus inflatus | Playfair | image |
| Phacus inflatus var. pterophorus | Skuja | image |
| Phacus inflexus | (Kiselev) Pochmann | image |
| Phacus inflexus var. minor | Bourrelly | image |
| Phacus intortus | Shi | image |
| Phacus iyengarii | Suxena | image |
| Phacus janiczakii | Stawinski | image |
| Phacus javorkae | Hortobágyi | image |
| Phacus kemenesii | Hortobágyi | image |
| Phacus kirchbergensis | Wawrik | image |
| Phacus koreana | Skvortzov | image |
| Phacus landekiensis | Stawinski | image |
| Phacus latus | (Roll) Pochmann | image |
| Phacus lefevrei | Bourrelly | image |
| Phacus lemmermanii | Svirenko | image |
| Phacus lemmermannii | (Svirenko) Skvortzov | image |
| Phacus lemmermannii | Svirenko | image |
| Phacus lemmermannii var. pochmannii | Bourrelly | image |
| Phacus lepocincloides | Pochmann | Arch. Protistenk. | 95: 231, fig. 150 | 1942 |
| Phacus limnophilus_('limnophila') | (Lemmermann) E.W. Linton & A. Karnkowska in I. Ciugulea & R.E. Triemer | Color atlas of photosynthetic euglenoids: | 103 | 2010 |
| Phacus limnophilus_('limnophila') | (Lemmermann) E.W. Linton & A. Karnkowska-Ishikawa in Linton et al. | Protist | 161: 609 | 2010 |
| Phacus lineatus | J. Massart | image |
| Phacus lismorensis f. minor | Hortobágyi | image |
| Phacus lismorensis f. sigmoidea | Wawrik | image |
| Phacus lismorensis | Playfair | image |
| Phacus lismorensis var. insecta | V. Conforti | Nova Hedwigia | 53: 87, pl. V: fig. 31 | 1991 |
| Phacus longicauda | (Ehrenberg) Dujardin | image |
| Phacus longicauda f. attenuatus | (Pochmann) Popova | image |
| Phacus longicauda f. cordatus | (Pochmann) Popova | image |
| Phacus longicauda f. curtus_('curta') | Lefèvre | Ann. Crypt. Exot. | 6: 262, figs. 1-3 | 1933 |
| Phacus longicauda f. curtus_('curta') | Lefčvre | image |
| Phacus longicauda f. insecta | Huber-Pestalozzi | Phytoplankton Süsswassers | 4: 223, fig. 302: A | 1955 |
| Phacus longicauda f. minor | Deflandre | image |
| Phacus longicauda f. rotundus | (Pochmann) Popova | image |
| Phacus longicauda f. subacauda | Popova | image |
| Phacus longicauda f. subcauda | T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 58, pl. II: fig. 11 | 1947 |
| Phacus longicauda f. tortuosus | (Skvortzov) Rai & Uherkovich | image |
| Phacus longicauda f. tortus 'Lemmermann' | | image |
| Phacus longicauda f. vix-tortus_('vix torta') | Kiselev | image |
| Phacus longicauda subsp. attenuata | Pochmann | image |
| Phacus longicauda subsp. cordata | Pochmann | image |
| Phacus longicauda subsp. cordatus_('cordata') | Pochmann | Arch. Protistenk. | 95: 199, fig. 109, 110 | 1942 |
| Phacus longicauda subsp. insecta | (Koczwara) Pochmann | image |
| Phacus longicauda subsp. madagassica | Pochmann | image |
| Phacus longicauda subsp. maior | (Svirenko) Pochmann | image |
| Phacus longicauda subsp. rotunda | Pochmann | image |
| Phacus longicauda subsp. rotundus_('rotunda') | Pochmann | Arch. Protistenk. | 95: 201, fig. 111 | 1942 |
| Phacus longicauda var. attenuata | (Pochmann) Huber-Pestalozzi | image |
| Phacus longicauda var. brevicauda | Skvortzov | image |
| Phacus longicauda var. brevicaudata 'Skvortzov' | | image |
| Phacus longicauda var. crevicauda | Skvortzov | image |
| Phacus longicauda var. indica | Skvortzov | image |
| Phacus longicauda var. insecta | Koczwara | image |
| Phacus longicauda var. lagunensis | Martinez | image |
| Phacus longicauda var. madagassica | (Pochmann) Huber-Pestalozzi | image |
| Phacus longicauda var. major | Svirenko | image |
| Phacus longicauda var. major | Svirenko | image |
| Phacus longicauda var. ovalis | Voronikhin | image |
| Phacus longicauda var. ovalis | Voronikhin | image |
| Phacus longicauda var. ovata | Skvortzov | image |
| Phacus longicauda var. rotundus_('rotunda') | (Pochmann) Huber-Pestalozzi | image |
| Phacus longicauda var. tortus_('torta') | Kofoid | image |
| Phacus longicauda var. tortus_('torta') | Lemmermann | image |
| Phacus longicauda var. undulata | Kiselev | image |
| Phacus longisulca | J.I. Kim & W. Shin | J. Phycol. | 50: 955, fig. 2A | 2014 |
| Phacus makii | Hirano | image |
| Phacus makrostigma | Pochmann | image |
| Phacus mammillatus | Philipose | image |
| Phacus manginii var. inflatus | Nygaard | image |
| Phacus manginii var. insecta | V. Conforti | Nova Hedwigia | 53: 89, pl. VI: fig. 33 | 1991 |
| Phacus manginii_('mangini') | Lefčvre | image |
| Phacus marconii | V. Conforti | Nova Hedwigia | 53: 89, pl. IV: fig. 25 | 1991 |
| Phacus mariae var. balatonicus | Hortobágyi | image |
| Phacus mariana | Deflandre | image |
| Phacus matanzae | V. Conforti | Nova Hedwigia | 53: 90, pl. III: fig. 18 | 1991 |
| Phacus maximus | Palik | image |
| Phacus megalopsis | Pochmann | Arch. Protistenk. | 95: 229, fig. 148 | 1942 |
| Phacus megapyrenoideus_('megapyrenoidea') | Roll | image |
| Phacus mentaweiensis | Conrad | image |
| Phacus meson f. tortus | Behre | image |
| Phacus meson | Pochmann | image |
| Phacus meson var. celebensis | Behre | image |
| Phacus meson var. minor | V. Conforti | Rev. Hydrobiol. Trop. | 27: 12, pl. IX: figs. 3, 4 | 1995 |
| Phacus minimus | J.I. Kim & W. Shin | J. Phycol. | 50: 955, fig. 2D | 2014 |
| Phacus minusculus | (Conrad) Pochmann | Arch. Protistenk. | 95: 221 | 1942 |
| Phacus minutus | (Playfair) Pochmann | image |
| Phacus mirabilis | Pochmann | Arch. Protistenk. | 95: 229, fig. 147 | 1942 |
| Phacus moniliatus var. suecicus_('suecica') | Lemmermann | image |
| Phacus moniliatus_('moniliata') | (Stokes) Lemmermann | image |
| Phacus monilicostatus -- | | image |
| Phacus monilicostatus | Pochmann | Arch. Protistenk. | 95: 240, fig. 164 | 1942 |
| Phacus monochloron | (Pochmann) Bourrelly | Rev. Algol., ser. 2, | 7: 103 | 1963 |
| Phacus monoparamylon | Hortobágyi | image |
| Phacus moorselensis | Conrad | image |
| Phacus moraviensis | Pochmann | image |
| Phacus morii | Skvortzov | image |
| Phacus morii var. insecta | (Koczwara) Skvortzov | image |
| Phacus mossambicensis | J.A. Rino | Revista Ci. Biol., Fac. Ci. Univ. Lourenc\*,o Marques, A, | 5: 154, pl. V: fig. 10 | 1972 |
| Phacus multiannulatus | Pochmann | image |
| Phacus multifacies | S. Alves-da-Silva & C. Bicudo | Hoehnea | 45: 144, figs. 1-29 | 2018 |
| Phacus multifidus | V. Conforti | Nova Hedwigia | 53: 91, pl. III: fig. 21 | 1991 |
| Phacus musculus | Pochmann | image |
| Phacus myersii f. maior | Uherkovich | image |
| Phacus myersii f. minor | Uherkovich | image |
| Phacus myersii | Skvortzov | image |
| Phacus nannos | Pochmann | image |
| Phacus neosulcatus | Z.X. Shi | Acta Hydrobiol. Sin. | 11: 358, 364, fig. 1 l, m | 1987 |
| Phacus niloticus | Conrad | image |
| Phacus nordstedtii | Lemmermann | Ark. Bot. | 2{2}: 124, pl. I: fig. 21 | 1904 |
| Phacus novus | V. Conforti | Nova Hedwigia | 53: 91, pl. IV: fig. 26 | 1991 |
| Phacus oblonga | Skvortzov | image |
| Phacus obolus | Pochmann | Arch. Protistenk. | 95: 153, fig. 43 | 1942 |
| Phacus obolus var. triangularis | Y.J. Ling, Z. Li & G.Z. Deng | Acta Phytotax. Sinica | 29: 381, fig. 11-13 | 1991 |
| Phacus ocellatus | (E.G. Pringsheim) B. Marin & M. Melkonian in B. Marin, A. Palm, M. Klingberg, & M. Melkonian | Protist | 154: 101 | 2003 |
| Phacus onyx | Pochmann | image |
| Phacus onyx var. symetrica | Tell & Y. Zalocar de Domitrovic | image |
| Phacus orbicularis f. communis | Popova | image |
| Phacus orbicularis f. gigas | (Da Cunha) Popova | image |
| Phacus orbicularis | Hübner | Euglenac.-Fl. Stralsund [Programm Realgymn. Stralsund]: | 5, fig. 1 | 1886 |
| Phacus orbicularis | Hübner | image |
| Phacus orbicularis var. amplus | Uhercovich | Dunántúli Dolgozatok | 10: 5-17. | 1976 |
| Phacus orbicularis var. caudata | Skvortzov | image |
| Phacus orbicularis var. cingeri | (Roll) Svirenko | image |
| Phacus orbicularis var. citriformis | (Drezepolski) Popova | image |
| Phacus orbicularis var. minor | Fritsch & Rich | image |
| Phacus orbicularis var. minor | Palik | image |
| Phacus orbicularis var. minor | Seckt | image |
| Phacus orbicularis var. undulata | Skvortzov | image |
| Phacus oscillans | Klebs | Unters. Bot. Inst. Tübingen | 1: 313, pl. III: fig. 6 | 1883 |
| Phacus oscillans var. curta | Skvortzov | image |
| Phacus oscillans var. elegans | Kufferath | image |
| Phacus ostreatus | Pochmann | image |
| Phacus ovalis | (Woronichin) Popova | image |
| Phacus ovalis | Skvortzov | image |
| Phacus ovoidea | Roll | image |
| Phacus ovum | (Ehrenberg) Klebs | Untersuch. Bot. Inst. Tübingen | 1: 314 | 1883 |
| Phacus ovum f. cylindricus_('cylindrica') | Klebs | Untersuch. Bot. Inst. Tübingen | 1: 314 | 1883 |
| Phacus ovum f. globula | Klebs | image |
| Phacus ovum f. globulus_('globula') | Klebs | Untersuch. Bot. Inst. Tübingen | 1: 314 | 1883 |
| Phacus ovum var. globula | Klebs in Hübner | Euglenac.-Fl. Stralsund [Programm Realgymn. Stralsund]: | 12 | 1886 |
| Phacus pannonicus | Palik | image |
| Phacus papillaris | Stawinski | image |
| Phacus paraorbicularis | J.I. Kim & W. Shin | J. Phycol. | 50: 956, fig. 2 | 2014 |
| Phacus parvula | Klebs | image |
| Phacus parvulus var. angustus_('angusta') | T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 58, pl. I: fig. 16 | 1947 |
| Phacus parvulus var. pusillus | (Lemmermann) Popova | image |
| Phacus parvulus_('parvula') | Klebs | Unters. Bot. Inst. Tübingen | 1: 313, pl. III: fig. 5 | 1883 |
| Phacus pediformis | Skvortzov | image |
| Phacus pekinensis | Skvortzov | image |
| Phacus pelta | Skvortzov | image |
| Phacus pentacauda_('pentacaudus') | V. Conforti | Nova Hedwigia | 53: 93, pl. III: fig. 20 | 1991 |
| Phacus persikon | Pochmann | Arch. Protistenk. | 95: 240, fig. 165 | 1942 |
| Phacus petelotii | Lefčvre | image |
| Phacus pisiformis | Z.X. Shi | Chin. J. Oceanol. Limnol. | 13: 350, fig. 2: 3-5 | 1995 |
| Phacus platalea | Drezepolski | image |
| Phacus platalea f. minor | Deflandre | image |
| Phacus platalea f. minor | Hortobágyi | image |
| Phacus platalea var. brevicaudatus | Y.J. Ling, Z. Li & G.Z. Deng | Acta Phytotax. Sinica | 29: 381, fig. 7-10. | 1991 |
| Phacus platalea var. major | Poucques | image |
| Phacus platalea var. minor | Kamat | image |
| Phacus platalea var. tiszae | Hortobágyi | image |
| Phacus platyaulax | Pochmann | image |
| Phacus pleuronectes | (O.F. Müller) Nitzsch | image |
| Phacus pleuronectes | (O.F. Mueller) Nitzsch ex Dujardin | Infusoires: | 336 | 1841 |
| Phacus pleuronectes f. communis | (Palik) T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 59 | 1947 |
| Phacus pleuronectes f. gigas | (Da Cunha) T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 59 | 1947 |
| Phacus pleuronectes f. hyalina | (Klebs) Pringsheim | image |
| Phacus pleuronectes f. natrophila | Kiss | image |
| Phacus pleuronectes f. tiszae | Pákh | image |
| Phacus pleuronectes var. australis | Playfair | image |
| Phacus pleuronectes var. brevicaudata | Klebs | image |
| Phacus pleuronectes var. citriformis | Drezepolski | image |
| Phacus pleuronectes var. citriformis | Drezepolski | image |
| Phacus pleuronectes var. hamelii | (Allorge & Lefèvre) T.G. Popova | Opred. Presnov. Vodor. SSSR | 7: 224 | 1955 |
| Phacus pleuronectes var. hamelii | (Allorge & Lefčvre) Popova | image |
| Phacus pleuronectes var. hamelii_('Hamellii') | (Allorge & Lefèvre) T.G. Popova | Izv. Zap. Sib. Fil. Nauk SSSR ser. biol. | 2: 59 | 1947 |
| Phacus pleuronectes var. hyalinus | Klebs | image |
| Phacus pleuronectes var. insecta | Koczwara | image |
| Phacus pleuronectes var. marginata | Skvortzov | image |
| Phacus pleuronectes var. minima | Palik | image |
| Phacus pleuronectes var. minimus | Palik | image |
| Phacus pleuronectes var. minor | Svirenko | image |
| Phacus pleuronectes var. minutus | Playfair | image |
| Phacus pleuronectes var. prunoideus | (Roll) Popova | image |
| Phacus pleuronectes var. svirenkoana | Skvortzov | image |
| Phacus pleuronectes var. svirenkoanus_('svirenkoana') | Skvortzov | Beih. Bot. Centralbl. | 41 (Abt. II): 313, fig. 3 | 1925 |
| Phacus pleuronectes var. triquetrus_('triquetra') | (Ehrenberg) Klebs | image |
| Phacus pleuronectes var. ungulatus | Tell & Y. Zalocar de Domitrovic | image |
| Phacus plicatus | Conrad | image |
| Phacus polyparamylon | Hortobágyi & Nemeth | image |
| Phacus polytrophos | Pochmann | image |
| Phacus polytrophos var. crassa | Bourrelly | image |
| Phacus pomiformis | (Conrad) Pochmann | image |
| Phacus poulae | V. Conforti | Nova Hedwigia | 53: 93, pl. III: fig. 19 | 1991 |
| Phacus procerus | Hortobágyi | image |
| Phacus prunoideus_('prunoidea') | Roll | image |
| Phacus pseudobicarinatus | S.M. Alves-da-Silva & C.E.M. Bicudo | Revista Brasil. Bot. | 32: 265, figs. 66-76 | 2009 |
| Phacus pseudonordstedtii | Pochmann | Arch. Protistenk. | 95: 219, figs. 134, 135 | 1942 |
| Phacus pseudonordstedtii var. minuscula | (Conrad) Huber-Pestalozzi | image |
| Phacus pseudonordstedtii var. minusculus_('minuscula') | (Conrad) Huber-Pestalozzi | Phytoplankton Süssw. | 4: 230 | 1955 |
| Phacus pseudopatalea var. indica | Kamat | image |
| Phacus pseudoswirenko | Prescott | image |
| Phacus pugiuncula | Geissbühler | image |
| Phacus pulcherrimus | (Conrad) Pochmann | Arch. Protistenk. | 95: 244 | 1942 |
| Phacus pulchra | Roll | image |
| Phacus pusilla | Lemmermann | image |
| Phacus pusillus_('pusilla') | Lemmermann | KryptFl. Mark Brandenburg | 3: 514, no fig. | 1910 |
| Phacus pygmaeus | Pochmann | image |
| Phacus pygmaeus | V. Conforti | Rev. Hydrobiol. Trop. | 27: 12, pl. III: fig. 23 | 1995 |
| Phacus pyrum | (Ehrenberg) Archer | Quart. J. Microscop. Sci., ser. 2, | 11: 99 | 1871 |
| Phacus pyrum f. minuscula | Conrad | image |
| Phacus pyrum f. minusculus_('minuscula') | Conrad | Bull. Mus. Roy. Hist. Nat. Belgique | 14{8}: 12, fig. 48 | 1938 |
| Phacus pyrum f. pulcherrima | Conrad | image |
| Phacus pyrum f. pulcherrimus_('pulcherrima') | Conrad | Bull. Mus. Roy. Hist. Belgique | 14{36}: 6, figs. 7, 8 | 1938 |
| Phacus pyrum var. australicus | (Playfair) Playfair | image |
| Phacus pyrum var. hastatus_('hastata') | E. Wehrle | Beiträge zur naturkundlichen Forschung in Süwestdeutschland | 4: 82, pl. II: fig. 4 | 1939 |
| Phacus pyrum var. longicauda | Skvortzov | image |
| Phacus pyrum var. nordstedtii | (Lemmermann) Deflandre | image |
| Phacus pyrum var. ovatus | Playfair | Proc. Linn. Soc. New South Wales | 46: 125, pl. V: fig. 15 | 1921 |
| Phacus pyrum var. punctulata | Allorge & Lefčvre | image |
| Phacus pyrum var. punctulatus_('punctulata') | Allorge & Lefèvre | Bull. Soc. Bot. France | 72(Sess. Extr.): 128, fig. 39 | 1931 |
| Phacus pyrum var. rudicula | Playfair | Proc. Linn. Soc. New South Wales | 46: 125, pl. V: fig. 17 | 1921 |
| Phacus quinquemarginatus | Jahn & Shawhan | image |
| Phacus raciborskii | Drezepolski | image |
| Phacus raciborskii var. longus | V. Conforti | image |
| Phacus raciborskii var. longus_('longa') | V. Conforti | Cryptog.: Algol. | 10: 73, fig. 3 | 1989 |
| Phacus raciborskii var. major | Bourrelly | image |
| Phacus raciborskii var. minor | Hortobágyi | image |
| Phacus raciborskii var. triqueter | Z.X. Shi | Acta Hydrobiol. Sin. | 11: 358, 364, fig. 1 n-p | 1987 |
| Phacus ranae | Skvortzov | image |
| Phacus ranula | Pochmann | Arch. Protistenk. | 95: 212 | 1942 |
| Phacus ranula var. africana | Bourrelly | image |
| Phacus ranula var. brevicaudatus | Philipose | image |
| Phacus ranula var. minor | V. Conforti | Nova Hedwigia | 53: 94, pl. VI: fig. 35 | 1991 |
| Phacus ranula_('ranulus') | Prescott | image |
| Phacus ranula_('ranulus') | Prescott | Ohio J. Sci | 55: 112, pl. III: fig. 13 | 1955 |
| Phacus rapacea | Skvortzov | image |
| Phacus regularis | Kufferath | image |
| Phacus rodriguesiae | V. Conforti | Rev. Hydrobiol. Trop. | 27: 15, pl. IV: figs. 5a-c | 1995 |
| Phacus rostafinski | Drezepolski | image |
| Phacus rostafinskii | Drezepolski | image |
| Phacus rostafinskii f. brevicaudata | Kiss | image |
| Phacus rotundata | Skvortzov | image |
| Phacus rotundus_('rotunda') | (Pochmann) Zakryś & M. Łukomska in Łukomska et al. | J. Phycol. | 51: 1153 | 2015 |
| Phacus rotundus_('rotunda') | Brabez | image |
| Phacus rudicula | (Playfair) Pochmann | Arch. Protistenk. | 95: 227 | 1942 |
| Phacus ruttneri | Bourrelly | image |
| Phacus salinus f. minor | I. Ciugulea & R.E. Triemer | Color atlas of photosynthetic euglenoids: | 118 | 2010 |
| Phacus salinus_('salina') | (Fritsch) E.W. Linton & A. Karnkowska in I. Ciugulea & R.E. Triemer | Color atlas of photosynthetic euglenoids: | 117 | 2010 |
| Phacus salinus_('salina') | (Fritsch) E.W. Linton & A. Karnkowska-Ishikawa in Linton et al. | Protist | 161: 609 | 2010 |
| Phacus schroeteri | Huber-Pestalozzi | image |
| Phacus segretii | Allorge & Lefčvre | image |
| Phacus segretii var. brevicaudata | Bourrelly | image |
| Phacus segretii var. major | V. Conforti | Rev. Hydrobiol. Trop. | 27: 15, pl. III: figs. 22a-c | 1995 |
| Phacus segretii var. ovum | Prescott | image |
| Phacus segretii var. punctulata | Allorge & Lefčvre | image |
| Phacus segretii var. punctulatus_('punctulata') | Allorge & Lefèvre | Bull. Soc. Bot. France | 72(Sess. Extr.): 128, figs. 61-63 | 1931 |
| Phacus sesquitortus | Pochmann | image |
| Phacus sesquitortus var. longicauda | A.A. Tolivia & V. Conforti in Tolivia et al. | Algol. Stud. | 140: 15, fig. 50 | 2012 |
| Phacus sesquitortus var. multiannulatus | V. Conforti | Rev. Hydrobiol. Trop. | 27: 15, pl. V: fig. 10 | 1995 |
| Phacus setosus | France | image |
| Phacus setosus var. crenatus_('crenata') | Skvortzov | image |
| Phacus setosus var. polonicus_('polonica') | Skvortzov | image |
| Phacus setosus var. quadrangulatus | Y. Yamagishi | Plankton algae of Southeast Asia: | 60, pl. 29: fig. 2 | 2010 |
| Phacus similis | Christen | image |
| Phacus similis f. minor | Bourrelly & Couté | Revue Algologique, N.S., | 13: 296, pl. I: fig. 3 | 1978 |
| Phacus skujae | Skvortzov | Bericht. Deutsch. Bot. Ges. | 46: 116, pl. II: fig. 42 | 1928 |
| Phacus smulkowskianus | (B. Zakryś) W.-H. Kusber | Willdenowia | 28: 246 | 1998 |
| Phacus snytjkovii | Y.V. Roll | Symposium dedicated to the memory of A.V. Fomin: | 138, 143, fig. 7 | 1938 |
| Phacus sooi | Hortobágyi | image |
| Phacus spinifer | Skvortzov | image |
| Phacus spiralis | Allegre & Jahn | image |
| Phacus spiralis | Skvortzov | image |
| Phacus spirogyra | Drezepolski | image |
| Phacus spirogyra var. maxima | Prescott | image |
| Phacus splendens | Pochmann | Arch. Protistenk. | 95: 224, fig. 141 | 1942 |
| Phacus starmachii | Stawinski | image |
| Phacus staurastroides | Conrad | image |
| Phacus stokesii f. minor | Conrad | image |
| Phacus stokesii | Lemmermann | image |
| Phacus stokesii var. minor | Kiss | image |
| Phacus striatus | Francé | Természetrajzi Füz. | 16: 91, 162, pl. II: fig. 2 | 1894 |
| Phacus striatus | France | image |
| Phacus strombuliformis | Z.X. Shi | Chin. J. Oceanol. Limnol. | 13: 351, fig. 1: 6-8 | 1995 |
| Phacus strongylus | Pochmann | Arch. Protistenk. | 95: 231, fig. 149 | 1942 |
| Phacus subspiralis f. crassus | Z. Shi | Acta Hydrobiol. Sinica | 10: 70, fig. 2c,d | 1986 |
| Phacus subspiralis | Z. Shi | Acta Hydrobiol. Sinica | 10: 70, fig. 2a,b | 1986 |
| Phacus suecica var. lata | Roll | image |
| Phacus suecicus f. major | Yacubson | image |
| Phacus suecicus | Lemmermann | image |
| Phacus suecicus var. inermis | Nygaard | image |
| Phacus sulcatus | Conrad | image |
| Phacus svirenkoanus | (Skvortzov) Z.X. Shi in Z.X. Shi et al. | Flora Algarum Sinicarum Aquae Dulcis. Tomus VI. Euglenophyta: | 217 | 1999 |
| Phacus swirenko | Skvortzov | image |
| Phacus tabodyana | Hortobágyi | image |
| Phacus tellii | V. Conforti | Cryptog.: Algol. | 10: 73, fig. 2 | 1989 |
| Phacus tenuis | Svirenko | image |
| Phacus teres | F. Schmitz | image |
| Phacus textus | Pochmann | image |
| Phacus thompsonii_('thompsoni') | Huber-Pestalozzi | image |
| Phacus thrombus f. minor | Hortobágyi | image |
| Phacus thrombus | Pochmann | image |
| Phacus tortifolius | Z.X. Shi | Acta Phytotax. Sin. | 34: 107, fig. 2 | 1996 |
| Phacus tortuosa | Roll | image |
| Phacus tortus f. brevicaudata | Huber-Pestalozzi | image |
| Phacus tortus var. helicoides | (Pochmann) Huber-Pestalozzi | image |
| Phacus tortus var. minima | Martinez | image |
| Phacus tortus var. roeckli_('Roecklii') | Pochmann | image |
| Phacus tortus var. sesquitortus | (Pochmann) Huber-Pestalozzi | image |
| Phacus tortus var. tortuosa | Skvortzov | image |
| Phacus tortus_('torta') | (Lemmermann) Skvortzov | image |
| Phacus trapezialis | Z.X. Shi in Shi et al. | Flora Algarum Sinicarum Aquae Dulcis. Tomus VI. Euglenophyta: | 264, pl. LXIX: figs. 3-5 | 1999 |
| Phacus trapezoides | Stawinski | image |
| Phacus trialatus | Wawrik | image |
| Phacus triangularis | Z.X. Shi | Acta Hydrobiol. Sin. | 11: 358, 365, fig. 2 a-c | 1987 |
| Phacus triangulus | Z.X. Shi | Acta Phytotax. Sin. | 34: 108, fig. 3 | 1996 |
| Phacus tricarinatus | Prowse | image |
| Phacus tricostatus | Conrad | image |
| Phacus trifacialis | Prowse | image |
| Phacus trimarginatus | Allegre & Jahn | image |
| Phacus trimarginatus var. truncatus_('truncata') | Z.X. Shi | Chin. J. Oceanol. Limnol. | 13: 351, fig. 2: 9-11 | 1995 |
| Phacus tripteris | Dujardin | Infusoires: | 338, pl. V: fig. 7 | 1841 |
| Phacus triqueter | (Ehrenberg) Perty | image |
| Phacus triqueter var. bucharica | Kiselev | image |
| Phacus triqueter var. hyalina | Perty | image |
| Phacus triqueter var. lata | Skvortzov | image |
| Phacus triqueter var. minor | Huber-Pestalozzi | image |
| Phacus triqueter var. oblongus | Z.X. Shi | Acta Hydrobiol. Sin. | 11: 360, 365, fig. 2 d, e | 1987 |
| Phacus triquetrus_('triquetra') | (Ehrenberg) Dujardin | image |
| Phacus tropicalis | V. Conforti | Rev. Hydrobiol. Trop. | 27: 15, pl. IV: figs. 3a-c | 1995 |
| Phacus tropidonotus | Conrad | image |
| Phacus trypanon | Pochmann | Arch. Protistenk. | 95: 222, fig. 139 | 1942 |
| Phacus turgidulus | Pochmann | Arch. Protistenk. | 95: 222, fig. 138 | 1942 |
| Phacus ulula | Pochmann | image |
| Phacus undulatus | (Skvortzov) Pochmann | image |
| Phacus undulatus f. major | (Prescott) Huber-Pestalozzi | image |
| Phacus undulatus f. minor_('minus') | Prescott | image |
| Phacus undulatus f. multiundulata | (Halász) Huber-Pestalozzi | image |
| Phacus undulatus var. carinatus | Bourrelly | image |
| Phacus undulatus var. myersi | (Skvortzov) Huber-Pestalozzi | image |
| Phacus undulatus | Z.X. Shi in Z.X. Shi et al. | Flora Algarum Sinicarum Aquae Dulcis. Tomus VI. Euglenophyta: | 233 | 1999 |
| Phacus unguis | Pochmann | image |
| Phacus unguis var. tihanyensis | Hortobágyi | image |
| Phacus unidentatus | Prowse | image |
| Phacus ventriosus | Pochmann | image |
| Phacus venustus | Pochmann | image |
| Phacus venustus var. prescottii | Huber-Pestalozzi | image |
| Phacus viguieri | Allorge & Lefčvre | image |
| Phacus viridioryza | J.I. Kim & W. Shin | J. Phycol. | 50: 956, fig. 2H | 2014 |
| Phacus warszewiczii | Drezepolski | image |
| Phacus warszewiczii | Drezepolski | image |
| Phacus wettsteinii_('wettsteini') | Drezepolski | image |
| Phacus woltereckii | Behre | image |
| Phacus zingeri | Roll | image |
| Phacus zmiewicus | Dedusenko-Shchegoleva | image |
| PROTEROPHACUS | A. Pochmann | image |
| PSEUDOPHACUS | Hansgirg | image |
| PYROPHACUS | F. Stein | image |
| Pyrophacus horologium | F. Stein | image |
| Pyrophacus horologium var. steinii | J. Schiller | image |
| Pyrophacus steinii | (J. Schiller) D. Wall & B. Dale | image |
| Pyrophacus vancampoae | (M. Rossignol) D. Wall & B. Dale | image |
| Scherffelia phacus | A.A. Pascher | image |
| SIDEROPHACUS | Beger | image |
| Siderophacus corneolus | (Dorff) Beger | image |
| SPIROPHACUS | Lemmermann | image |