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This species is separated from M. constrictum by its headpole not being constricted.

LM scalebar = 10 µm
Meridion circulare LM3 Meridion circulare LM2 Meridion circulare LM1 Meridion circulare LM6 Meridion circulare LM5
Length Range
17-80 µm
Width Range
3-4 µm

Also compare to

Meridion constrictum

Ralfs 1843