- Navicula constans var. symmetrica Hustedt
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Abh. Naturwiss. Ver. Bremen 34: 289, text-figs. 40, 41.
1957.
(L)
Type: BRM 143/7 (HT fide Simonsen, Atlas & Cat. Diatom Types Hustedt: 442, pl. 658: figs. 41-44. 1987)
Type locality: Germany: Weser River near Bremen
See Placoneis constans var. symmetrica (Hustedt) H. Kobayasi 2002
See Placoneis symmetrica (Hustedt) H. Lange-Bertalot 2005
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