Names from Index Nominum Algarum

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Himantidium bidens Ehrenberg: Abh. Königl. Akad. Wiss. Berlin, Phys. Kl. 1841: 417. 1843. (L)
Type: pl. 3/1: fig. 14 (based on Pelham specimen) in Ehrenberg, Mikrogeologie. 1854. (LT fide S. Mayama & H. Lange-Bertalot in H. Lange-Bertalot et al., 2011: 231)
Type locality: Iceland; Labrador; USA (Massachusetts: Boston, Pelham, and Spencer; Rhode Island: Smithfield; Maine)

See image Himantidium arcus var. bidens (Ehrenberg) Grunow 1862
See image Eunotia praerupta f. bidens (Ehrenberg) Hustedt 1911
See image Eunotia praerupta var. bidens (Ehrenberg) Grunow 1880
See image Eunotia arcus var. bidens (Ehrenberg) Kirchner 1878
[cf. Eunotia bidens err. cit.; cf. Eunotia praerupta-bidens Å. Berg 1939]