Genus: 
 Locomotive, 100-500 μm long; 
with 2-5 longitudinal ridges, few peripheral bristle-like pseudopods 
(short, clear, conical, spine-like, 10-12 μm long); 
ectoplasm clear; endoplasm finely granular; nucleus obscure; contractile vacuole none; 
vesicles 5-10 μm; crystals none (Illustrated Guide, 1985).  
Species: 
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