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Plagiotropis lepidoptera var. proboscidea has smaller valves with striae that are parallel at the valve center. Furthermore, the areolae are difficult to resolve in LM and number 26-30 in 10 ┬Ám.

LM scalebar = 10 µm
Plagiotropis arizonica LM7 Plagiotropis arizonica LM6 Plagiotropis arizonica LM5 Plagiotropis arizonica LM4 Plagiotropis arizonica LM3 Plagiotropis arizonica LM2 Plagiotropis arizonica LM1
Length Range
147-180 µm
Width Range
24-31 µm
Striae in 10 µm
13-15 (center); 16-17 (ends)

Plagiotropis lepidoptera var. proboscidea

(Cleve) Reimer in R.M.Patrick and Reimer 1975

Plagiotropis lepidoptera var proboscidea LM7 Plagiotropis lepidoptera var proboscidea LM6 Plagiotropis lepidoptera var proboscidea LM5 Plagiotropis lepidoptera var proboscidea LM4 Plagiotropis lepidoptera var proboscidea LM3 Plagiotropis lepidoptera var proboscidea LM2 Plagiotropis lepidoptera var proboscidea LM1
Length Range
73-110 µm
Width Range
17.1-20.4 µm
Striae in 10 µm
17-19