Arcella rota - Photomicrograph Ralf Meisterfeld

 

 

Arcella rota Daday, 1905

 

Diagnosis: Test in dorsal view circular with numerous, 38-40, small spines, giving the impression of a gear. These spines are curved, pointing downwards. Test in side view flat, height about ¼ of the diameter.

 

Ecology: freshwater, Paraguay.