Description of a new gregarine species, Zygocystis perionyxae sp. n. (Protozoa: Zygocystidae) , from the earthworm Perionyx gravelleyi (Annelida: Oligochaeta) from west Bengal, India

Bandyopadhyay, P.K.; Mitra, A.K.

Protistology 42: 91-95

2005


Accession: 022356790

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Abstract
Surveys of acephaline gregarines from Canning (West Bengal, India) revealed the occurrence of a new species of Zygocystis Stein 1848 in the coelomic fluid of the earthworm Perionyx graveleyi. Its trophozoites are fusiform and are always found in syzygy. The union is effected by a convex protrusion of one trophozoite fitting into a regular concave depression of the other. There is an extended cylindrical extension at the free end. Nucleus is spherical to ellipsoid. Gametocysts are spherical; oocysts navicular.