Summary
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1.
The detailed morphology and life-history of a dicystid gregarine,Lecudina pellucida (Köll.) Mingazzini, from the gut ofNereis chilkænsis Southern, are described.
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2.
The young stages of the parasite are intra-epithelial while the adult trophozoites lie free in the lumen of the gut attached to the intestinal wall by a sucker-like epimerite.
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3.
Cyst-formation takes place in the mid-gut and further development of the cysts takes place outside the host.
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4.
Gametogenesis is completed in about 48 hours. The gametes are anisogamous.
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5.
Spore-formation takes place in about 3 days and the spores are scattered by simple rupture of the cyst. The sporocysts are ovoidal with a thickening at one pole. There are eight sickle-shaped sporozoites and a spherical sporocyst residuum.
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6.
The systematic position of the genusLecudina Mingazzini and of the family Lecudinidæ Kamm are discussed in the light of these observations.
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Communicated by Dr. N. Kesava Panikkar,f.a.sc.
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Ganapati, P.N. On lecudina pellucida (kÖlliker) mingazzini (1891) from the gut of nereis chilkaensis southern. Proc. Indian Acad. Sci. 23, 211–227 (1946). https://doi.org/10.1007/BF03049917
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DOI: https://doi.org/10.1007/BF03049917