This species is distinguished by the posterior position of its flagella, by the broad excavation of the posterior sulcus, divided midway by a tentacle-like lobe, and by the partial encirclement of the girdle. Other characters are its elongate ellipsoidal form and absence of chromatophores. AMPHIDINIUMClaparede and Lachmann KEY TO SPECIES Chromatophores present : Chromatophore single 4. carteri Chromatophores many -1. wislouchi Chromatophores absent : Body stout, with rounded ends A.

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