Spaulding, S.,
Edlund, M.
(2008).
Pleurosira.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/pleurosira?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Centric
Pleurosira
Valves orbicular
Ocelli 2-4, prominent
Rimoportula 1 or more, positioned near center of valve
Valves form zig-zag colonies
Pleurosira has very large orbicular valves with 2-4 prominent ocelli, the number depending on salinity. The ocelli secrete mucopolysaccaride pads that join cells together in large, zig-zag colonies. One or more rimoportula are positioned near the center of the valve face. Colonies form filaments that are visible in streams.
Pleurosira is...