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Compare Psammothidium semiapertum

(Hust.) Aboal in Aboal, Alvarez-Cobelas, Cambra and Ector 2003

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Psammothdium pennsylvanicum has a higher density of areola within a stria (35-40 in 10 μm).

Psammothidium subatomoides has a higher stria density.

LM scalebar = 10 µm
Psammothidium semiapertum LM5 Psammothidium semiapertum LM4 Psammothidium semiapertum LM1 Psammothidium semiapertum LM3 Psammothidium semiapertum LM2 Psammothidium semiapertum LM6
Length Range
8.5-10.4 µm
Width Range
4.4-5.2 µm
Striae in 10 µm
22-24

Psammothidium pennsylvanicum

Potapova 2012

Psammothidium pennsylvanicum LM2 Psammothidium pennsylvanicum LM1 Psammothidium pennsylvanicum LM6 Psammothidium pennsylvanicum LM5 Psammothidium pennsylvanicum LM4 Psammothidium pennsylvanicum LM3
Length Range
9–13 µm
Width Range
5.0–5.4 µm
Striae in 10 µm
25–29

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

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