The phylogenetic significance of the genus Pseudomicrothorax in the evolution of holotrichous ciliates

Corliss, J.O.

Acta Biol Acad Sci Hungaricae 8(4): 367-388


Accession: 025884174

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The following proposals are tentatively made (1) Pseudomicrothorax should be classified as a primitive hymenostome holotrich; (2) Pseudomicrothorax should be included in a group, possibly a new suborder of Hymenostomatida, connecting the cyrtophorine gymnostomes with the hymenostomes, and that it should serve as the parent stock for the Tetrahymenina and Peniculina; (3) the cyrtophorine gymnostomes should be recognized as a much more phylogenetically important group, which are probably the ancestors of hymenostome as well as chonotrich groups; (4) the evolutionary line of hymenostomes-trichostomes-hymenostomes should be abandoned, since the rhabdo-phorine gymnostomes probably gave rise only to a dead-end trichostome group; (5) the Trichostomatida should be characterized, in part, by the presence of a vestibulum unaccompanied by a true buccal cavity, thus precluding further acceptance of Pseudomicrothorax as a trichostome; (6) the possession of true buccal cavities and buccal ciliary complexes ' should be considered definitive of hymenostomes and higher orders and not ever acceptable as features of gymnostome or trichostome species. This would make Pseudomicrothorax, with its clearly recognizable adoral zone of membranelles, at least a hymenostome genus.