Volume 23, Issue 5
May 1946, pages 211-248
pp 211-227 May 1946
The detailed morphology and life-history of a dicystid gregarine,Lecudina pellucida (Köll.) Mingazzini, from the gut ofNereis chilkænsis Southern, are described.
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.
Cyst-formation takes place in the mid-gut and further development of the cysts takes place outside the host.
Gametogenesis is completed in about 48 hours. The gametes are anisogamous.
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.
The systematic position of the genusLecudina Mingazzini and of the family Lecudinidæ Kamm are discussed in the light of these observations.
pp 228-248 May 1946
Four genera belonging to seven species of Eugregarines and two genera comprising of five species of Schizogregarines are described from some common polychætes found at Madras. The hosts examined include nine genera of as many species.
Of the seven Eugregarines described six are new to science, and all of them come under the family Lecudinidæ Kamm emend Reichenow, 1929. The three genera,Polyrhabdina, Sycia andAncora are recorded for the first time from India. The retention of the genusSycia Leger as different fromUlivina Mingazzini, and its inclusion in the family Lecudinidæ have been suggested.
The Schizogregarines described come under the generaSelenidium Giard andSiedleckia Caull. and Mesn. Four new species ofSelenidium are described while the fifth one has been provisionally assigned to this genus. The genusSiedleckia is a new record from India.