Diatoms of North AmericaDiatoms of North America
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Compare Cocconeis pseudothumensis

E.Reichardt 1982

Compare

Cocconeis disculus is larger and has a more narrow axial area. Cocconeis neodiminuta has finer striae on the rapheless valve and a more narrow axial area.

LM scalebar = 10 µm
Cocconeis pseudothumensis LM4 Cocconeis pseudothumensis LM3 Cocconeis pseudothumensis LM5 Cocconeis pseudothumensis LM6 Cocconeis pseudothumensis LM1 Cocconeis pseudothumensis LM2
Length Range
9-15.3 µm
Width Range
6.9-10.6 µm
Striae in 10 µm
rapheless: 10-14, raphe: 25-27 at margin, 38-40 near axial area

Cocconeis neodiminuta

Krammer 1990

Cocconeis Neodiminuta Lm04 Cocconeis Neodiminuta Lm06 Cocconeis Neodiminuta Lm02 Cocconeis Neodiminuta Lm03 Cocconeis Neodiminuta Lm05 Cocconeis Neodiminuta Lm01
Length Range
7-18 µm
Width Range
5-9 µm
Striae in 10 µm
Raphe valve 24-32, rapheless valve 11-14

Also compare to

Cocconeis disculus

BioData Reference
Krammer and Lange-Bertalot 2/4 PL 56 Fig1-13