Diatoms of North AmericaDiatoms of North America
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Compare Cavinula maculata

Potapova, Cvetkoska, Hamilton and Levkov in Cvetkoska et al. 2014

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Cavinula maculata resembles C. scutiformis in size, striae orientation, and in regard to the enlarged and thickened central nodule. The valve outline of C. maculata is, however, elliptic-lanceolate rather than elliptic as in C. scutiformis and the central area is conspicuously larger. The axial area of C. maculata is also narrower and more linear. Areolae around the central area in C. scutiformis are usually transversely elongated, while they are small and circular in C. maculata.

LM scalebar = 10 µm
Cavinula maculata LM6 Cavinula maculata LM1 Cavinula maculata LM5 Cavinula maculata LM2 Cavinula maculata LM4 Cavinula maculata LM7 Cavinula maculata LM3
Length Range
25-41 µm
Width Range
15-20 µm
Striae in 10 µm
20-25

Cavinula scutiformis

(Grunow ex Schmidt) D.G.Mann and Stickle in Round et al. 1990

Cavicula scutiformis LM1 Cavicula scutiformis LM2 Cavicula scutiformis LM3 Cavicula scutiformis LM4 Cavicula scutiformis LM5 Cavicula scutiformis LM6 Cavicula scutiformis LM7
Length Range
18-36 µm
Width Range
12.3-17.7 µm
Striae in 10 µm
24-26 at the valve center, 28-32 near the apices