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Platessa lutheri differs from P. kingstonii by its larger, bow-tie-shaped central area on the raphe valve and biseriate, rather than triseriate striae on the rapheless valve.

LM scalebar = 10 µm
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