Diatoms of North AmericaDiatoms of North America
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Compare Platessa oblongella

(Østrup) C.E. Wetzel, Lange- Bertalot and Ector 2017

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Platessa lutheri and P. kingstonii also have a higher stria density on the raphe valve, as compared to the rapheless valve. These taxa, however, have a rapheless valve with a much wider axial area.

LM scalebar = 10 µm
Karayevia oblongella LM1 Karayevia oblongella LM2 Karayevia oblongella LM7 Karayevia oblongella LM5 Karayevia oblongella LM4 Karayevia oblongella LM6 Gsn23403 Ploblongella 2A
Length Range
6-18 µm
Width Range
3.7-7 µm
Striae in 10 µm
9-12 on rapheless valve, 24-30 on raphe valve

Platessa lutheri

(Hust.) Potapova 2012

Platessa lutheri LM1 Platessa lutheri LM6 Platessa lutheri LM5 Platessa lutheri LM4 Platessa lutheri LM2 Platessa lutheri LM3
Length Range
8-17 µm
Width Range
4.5-6.0 µm
Striae in 10 µm
25–29 on raphe valve, 12–15 on rapheless valve

Platessa kingstonii

Potapova 2012

Platessa kingstonii LM6 Platessa kingstonii LM7 Platessa kingstonii LM1 Platessa kingstonii LM2 Platessa kingstonii LM3 Platessa kingstonii LM5 Platessa kingstonii LM4
Length Range
7.4–11 µm
Width Range
4.4–5.0 µm
Striae in 10 µm
26–30 on raphe valve, 12-15 on rapheless valve