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Re-evaluation of the phylogenetic position of the genus Dexiotrichides (Protozoa, Ciliophora, Scuticociliatida) inferred from stomatogenetic and molecular information for Dexiotrichides pangi

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Progress in Natural Science:Materials International 2005年第8期15卷 700-707页

作者： Alan WARREN,David ROBERTS,Norbert WILBERT London SW7 5BD UK Zoologisches Institut Universitt Bonn 53115 Bonn Germany Department of Zoology Natural History of Museum Cromwell Road London SW7 5BD UK Department of Zoology Natural History of Museum Cromwell Road

The divisional process and systematic position of the marine scuticociliate Dexiotrichides pangi are studied. Based on both stomatogenetic data and 18S rDNA gene sequences, the phylogeny and morphogenetic characteristics of this taxon, and of other related genera, are analyzed and discussed. Both the divisionary events and the molecular biological data indicate that this species/genus, together with certain other genera in the Dexiotricha-complex, occupies an intermediate position between the tetrahymenids and the “typical” scuticociliate, which suggests that the Dexiotricha-like taxa should be excluded from the “true” scuticociliates. As a further contribution, the process of stomatogenesis in D. pangi can be summarized as follows: (1) The oral primordia in the opisthe are formed only by the proliferation of basal bodies in the scutica field, which subsequently develop into three membranelles, while the new paroral membrane seems to be generated by the sub-anterior portion of somatic kinety 1 (the 1st postoral intercalary kinety). The latter character exhibits a mode similar to Tetrahymena. (2) In the proter the parental membranelles are retained and remain unchanged throughout the entire division process; only the old paroral membrane is disassembled and differentiated into the anlage, which then gives rise to the new paroral membrane and the scutica of the proter. The 18S rRNA gene sequence reported here is the first one for a ciliate in the Dexiotricha-complex.

关键词： marine ciliate systematic position stomatogenesis 18S rRNA gene sequences Dexiotrichides pangi.

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Morphogenetic Processes in Division of Uronemella filificum (Ciliophora, Scuticociliatida)

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Journal of Ocean University of China 2002年第2期1卷 140-144页

作者： MA Hongwei, SONG Weibo *, MA Honggang Laboratory of Protozoology, MRL, Ocean University of Qingdao, Qingdao 266003, P.R.China Laboratory of Protozoology MRL Ocean University of Qingdao Qingdao P.R. China

The morphogenetic processes of Uronemella filificum (Kahl, 1931) Song and Wilbert ①, were studied using protargol method. The stomatogenesis of U. filificum can be summarized as follows: membranelles 1-2, paroral membrane and scutica of the opisthe originate from the parental paroral membrane, while membranelle 3 in the opisthe develops from the parental scutica. The paroral membrane of the proter developes from the parental paroral membrane. The stomatogenetic sequences are similar to the previous descriptions for other related taxa. The phylogenetic position of Uronematidae is discussed in the light of morphogenetic data obtained.

关键词： marine ciliate Scuticociliatida stomatogenesis Uronemella filificum

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