Diatoms of North AmericaDiatoms of North America
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Compare Cocconeis fluviatilis

J.H.Wallace 1960

Cocconeis placentula sensu lato has a higher stria density on both valves and the areolae are the same size across the valve face.

LM scalebar = 10 µm
Cocconeis fluviatilis LM1 Cocconeis fluvuatilis LM2 Cocconeis fluviatilis LM4 Cocconeis fluviatilis LM5 Cocconeis fluviatilis LM3
Length Range
20-24 µm
Width Range
13-19 µm
Striae in 10 µm
12-13
Cocconeis placentula LM1 Gc109658 Mo000285 Ccplac2 Ed Gc109658 Mo000285 Ccplac3 Ed Gc100282 Gs016353 Cclplac1 Ed Gc109658 Mo000285 Ccplac1 Ed Gc108381 Nx000030 Ccpseudol1 Ed Gc100282 Gs016353 Cclplac2 Ed
Length Range
9-68 µm
Width Range
7-32 µm
Striae in 10 µm
20-24 on raphe valve, 15-25 on rapheless valve