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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 4787

Weibo Song; [Morphologie und Morphogenese des Bodenciliaten Periholosticha wilberti nov. spec. (Ciliophora, Hypotrichida)] (The Morphology and Morphogenesis of the Soil Ciliate Periholosticha wilberti nov. spec. (Ciliophora, Hypotrichida)). Arch.Protistenk 138:221-231, 1990

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The morphology and morphogenesis of the soil hypotrichous ciliate Periholosticha wilberti nov. spec. from Qingdao (Tsingtao, 36 degrees 8'N, 120 degrees 43'E), P.R.China are investigated. Periholosticha wilberti differs from the other members of the genus by its bodyshape and the infraciliature. 8 stages of the cortical and nuclear fission are described and depicted. The morphogenesis starts with a proliferation of the basal bodies for the primordia (primary primordia) close by the postoral ventral cirri. The primary primordia break up during the middle stages of the morphogenesis and form secondary primordia; the anterior ones become the anlagen of the frontoventral cirri of the proter, the posterior ones become that of the opisthe. Anlage I evolves from the oral primordium in the proter, but in the opisthe it develops from the anlagencomplex of the frontoventral cirri (primary primordia). The anlagen 1 to 3 generate 1, 1(2), 2 frontal cirri; the frontoterminal cirri develop from the last anlage; the ventral cirri come from the one befor the last one and the rest anlagen make up the midventral cirri. During the morphogenesis there are no transversal cirri which can be identified. The overall pattern of the morphogenetic events and the infraciliature are similar to the genus Parabakuella Song & Wilbert, 1988, which has many short ventralcirrus rows. According to its morphogenesis and infraciliature the species is very characteristic for the family Urostylidae and to be considered as a true member of it.