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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 7605

Anne Fleury, Francine Iftode, Gilbert Deroux, and Ghislaine Fryd-Versavel; [Unite et Diversite chez les Hypotriches (Protozoaires Cilies): III. - Elements D'ultrastructure Comparee chez Divers Representants du Sous-ordre des Pseudohypotrichina et Remarques Generales]. Protistologica XXII(1):65-87, 1986

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By comparison to Euhypotrichina, the Pseudohypotrichina morphotypes so far investigated show specific particularities. Uronychia transfuga and Kiitricha sp. are characterized by both the low density of the basal connective system of cirri and the occurrence of an extensive microfibrillar network while Aspidisca lyncaster turns to be related to Euplotes and Diophrys appendiculata to Certesia. This suborder is quite heterogeneous at the ultrastructural level. Considering together the ultrastructural patterns and the morphogenetic ones, some assumptions can be made about diversification of Hypotrichs. The heterogeneity displayed by Pseudohypotrichina in cirral organization suggests that some of the dorsal characters on which the definition of the suborder is found are plesiomorphic, while the alternative characters found in Euhypotrichina are apomorphic. Thus, the Pseudohypotrichina suborder is probably a paraphyletic taxon.