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Psammothidium curtissiumum differs from P. subatomoides by smaller size (except the smallest specimens of P. subatomoides), by very small central areas on both valves, and by generally lower striae density.

LM scalebar = 10 µm
Psammothidium curtissimum LM2 Psammothidium curtissimum LM1 Mo000019  Pscurt 1A Ed Mo000019  Pscurt 1B Ed Psammothidium curtissimum LM4 Psammothidium curtissimum LM5 Psammothidium curtissimum LM3
Length Range
4.9-8.5 µm
Width Range
3.5-4.0 µm
Striae in 10 µm
27-31

Psammothidium subatomoides

(Hust.) Bukht. and Round 1996

Psammothidium subatomoides LM10 Psammothidium subatomoides LM2 Psammothidium subatomoides LM4 Psammothidium subatomoides LM6 Psammothidium subatomoides LM8
Length Range
5.5–11 µm
Width Range
3.2-6.0 µm
Striae in 10 µm
30-40