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Most noticeably, the median rib in A. pellucida is consistent in width while that of A. lindheimeri is irregularly widened in the center of the valve. In addition, the stria density of A. pellucida is much higher than that of A. lindheimeri (26-28 in 10 µm).

LM scalebar = 10 µm
Amphipleura pellucida LM1 Amphipleura pellucida LM2 Amphipleura pellucida LM3 Amphipleura pellucida LM4 Amphipleura pellucida LM5
Length Range
68.0-105.0 µm
Width Range
7.0 µm
Striae in 10 µm
48

Also compare to

Amphipleura lindheimeri

Grunow