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
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