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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 7733

Francine Iftode, Ghislaine Fryd-Versavel, and Denis H. Lynn; New Details of the Oral Structures of Colpidium and Turaniella and Transfer of the Genus Colpidium to the Turaniellidae Didier, 1971 (Tetrahymenina, Hymenostomatida). Protistologica XX(3):463-474, 1984

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The genera Colpidium and Turaniella have been compared using the pattern of stomatogenesis and ultrastructural features of the isolated oral apparatus and the paroral membrane. The leftward rotation of the oral anlage during stomatogenesis of both Colpidium and Turaniella breaks kinety n in the former genus and kinety n together with as many as 6 other kineties to the left in the latter genus. This isolates fragments of these kineties to the anterior left of the oral region. The isolated oral apparati of Colpidium and Turaniella can be characterized as filamentous in contrast to the isolated oral apparatus of Tetrahymena which is much more << microtubular >>. The ultrastructure of the paroral dikinetids of Colpidium and Turaniella cannot be distinguished from other tetrahymenine hymenostomes. The similarities in morphostatic structure, stomatogenesis, and structure of the isolated oral apparatus unite Colpidium and Turaniella more closely to each other than to other tetrahymenids. It is proposed that Colpidium be transferred to the family Turaniellidae Didier, 1971 whose diagnosis is emended to accomodate this change.