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Meisterfeldia  Bobrov, 2016 Description: Test ovoid; bilaterally symmetrical, more or less laterally compressed; colorless, yellow or brown; composed of proteinaceous material without mineral particles; aperture circular, subterminal as seen on ventrally and obliquely cut apertural end, or it is situated on a well developed or poorly expressed neck inclined ventrally; sometimes aperture border shows a slight swelling. Type species: Meisterfeldia chibisovi Bobrov, 2016
Key to the genera
1
Shell length exceeds 30 μm
Shell length less than 20 μm
2
2
Shell with distinct pseudostomal neck and apertural lip
Shell without pseudostomal neck and apertural lip
3
3
Shell cross section is circular. There is no invagination on the ventral side. Shell length 13–16 μm
Shell is more or less flattened. There is more or less prominent invagination on the ventral side. Shell length 6–11 μm
4
4
Aperture circular
Aperture elliptic
5
5
Shell flattened (shell depth:breadth ratio is 0.60–0.70)
Shell slightly flattened (shell depth:breadth ratio is 0.85–0.95)
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