Spaulding, S.,
Edlund, M.
(2009).
Biremis.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/biremis?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Symmetric Biraphid
Biremis
Valves with linear margins
Striae not continuous across valve face
Striae chambered, open externally in circular or slit-like foramina
Valve mantle with similar chambered striae
Biremis currently contains both freshwater and marine species. Freshwater species possess a linear margin and bilateral symmetry, while marine species are strongly dorsiventral, with amphoroid symmetry. The striae of Biremis appear to be "interrupted" (they are not continuous), due to internal plates that cover marginal chambered striae....