Arcella sp2

Specimen # 22187:
Diameter shell: 91.4 µm

Specimen # 21892:
Diameter shell: 95.5 µm

Diameter aperture: 24.5 µm

Specimen # 20577:

Diameter shell: 112.9 µm

Specimen # 20598:
Diameter shell: 104.1 µm

I could not measure the diameter of the aperture for some of the specimens. Unfortunately, all these specimens were only photographed on one side (apical view). For now on I will try to photograph all the necessary diagnostic taxonomic characters and all the possible views.

I think all these specimens are similar to Arcella costata. I posted Specimen #20577 earlier. It appears in a picture next to another specimen that I called Arcella megastoma.