I found this ciliate in a sample of activated sludge.
Very similar to Thuricola (lorica; body size), but with big "leg".
What genus is it?
Dear Katarzyna, cannot see good from the image.
Can be Cothurnia (more possible, or Ophrydium) but they are normally epibiontic or periphytic. Photoimage not enough. Make good figure. Configuration and proportions of lorica is very important. Leg can be contracted or streched. For good preparation should use Foissner dry method. For preidentification -
eg page 251 of
Foissner W., Berger H., Kohmann F. Taxonomische und ökologische Revision der Ciliaten des Saprobiensystems – Band II: Peritrichia, Heterotrichida, Odontostomatida. -Informationsberichte des Bayer. Landesamtes für Wasserwirtschaft. -1992. -5/92. -502 p.
Andrey
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