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Uroleptopsis Kahl, 1932 (Ciliophora: Hypotricha): Morphology and Cell Division of Type Species, Redefinition, and Phylogenetic Relationships
並列摘要
The morphology and the morphogenesis of the marine hypotrich Uroleptopsis citrina Kahl, type of Uroleptopsis Kahl, were investigated using live observation and protargol impregnation. The results are used for a redefinition of Uroleptopsis and a phylogenetic analysis of the Pseudokeronopsidae. Each of the many macronuclear nodules of U. citrina divides individually as in Pseudokeronopsis spp., that is, the nodules do not fuse to a single mass. Consequently, Uroleptopsis, Pseudokeronopsis, and Thigmokeronopsis-which shows an intermediate type of macronuclear division-are united to the Pseudokeronopsidae. Uroleptopsis has three autapomorphies, namely the lack of transverse cirri, the formation of two cirri from the undulating membrane anlage, and a gap in the adoral zone. Uroleptopsis ignea has midventral rows which are the autapomorphy for the new subgenus Uroleptopsis (Plesiouroleptopsis). Uroleptopsis (Uroleptopsis), which contains the four other Uroleptopsis species, lacks a buccal cirrus in the ordinary position right of the paroral; in non-dividers this cirrus is part of the posterior bow of the bicorona. In U. citrina some cirral anlagen of the middle portion of the midventral complex do not form an ordinary cirral pair, but only a single midventral cirrus. Keronopsis tannaensis Shigematsu is transferred to Uroleptopsis because it lacks transverse cirri and has likely a bicorona. Keronopsis multiplex Ozaki and Yagiu is synonymized with U. roscoviana (Maupas). A key to the five Uroleptopsis species is provided and the terminology for urostylids is actualized. The Uroleptopsis citrina population from the Adriatic Sea is designated as neotype because (i) no preparations are available of the original type population, and (ii) synonymy with Pseudokeronopsis rubra and some other species was proposed by Borror (1979) and Borror and Wicklow (1983).
延伸閱讀
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