Meisterfeldia

Bobrov, Anatoly & Mazei, Yuri, 2021, Meisterfeldia bitsevi-new testate amoeba of the family Cryptodifflugiidae Jung 1942 (Amoebozoa: Arcellinida) from the tree hollow in the urban park (Moscow Russia) with a key to species of the genus Meisterfeldia, Zootaxa 4908 (4), pp. 595-600 : 599

Key to the species of the genus Meisterfeldia

1. Shell length exceeds 30 µm ...................................................................... M. bitsevi

1’. Shell length less than 20 µm ............................................................................ 2

2. Shell with distinct pseudostomal neck and apertural lip.............................................. M. turfacea

2’. 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 .......... M. vanhoornei

3’. 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............................................................................ M. chibisovi

4’. Aperture elliptic...................................................................................... 5

5. Shell flattened (shell depth:breadth ratio is 0.60–0.70)............................................... M. wegeneri

5’. Shell slightly flattened (shell depth:breadth ratio is 0.85–0.95)........................................ M. polygonia