Diatoms of North AmericaDiatoms of North America
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Compare Cocconeis fluviatilis

J.H.Wallace 1960

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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 sensu lato

Ehrenb. 1838

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