Diatoms of North AmericaDiatoms of North America
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Compare Placoneis anglophila

(Lange-Bert.) Lange-Bert. in Metzeltin, Lange-Bert. and García-Rodríguez 2005

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Placoneis gastrum has rostrate, broadly rounded apices. Placoneis anglica is larger in size (20-27 µm) and has a transverse central area. Placoneis elginensis has linear valve margins and a transverse central area.

LM scalebar = 10 µm
Placoneis anglophila LM12 Placoneis anglophila LM13 Placoneis anglophila LM14 Ill 2015 24 Iwb 3 Cl Ill 2015 24 Iwb 2 Cl Ill 2015 15 Iwb 18 Cl Shrunk
Length Range
18-21 µm
Width Range
7.5-8.5 µm
Striae in 10 µm
9-10

Placoneis gastrum

(Ehrenb.) Mereschk. 1903

Placoneis gastrum LM6 Placoneis gastrum LM5 Placoneis gastrum LM4 Placoneis gastrum LM3 Placoneis gastrum LM2 Placoneis gastrum LM1
Length Range
30.2-55.8 µm
Width Range
15.9-20.0 µm
Striae in 10 µm
7-9 near the center, up to 10 near the apices

Also compare to

Placoneis anglica

Ralfs

Placoneis gastrum

(Ehrenb.) Mereschk.