期刊
ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
卷 196, 期 1, 页码 88-104出版社
OXFORD UNIV PRESS
DOI: 10.1093/zoolinnean/zlab102
关键词
Clampia; hypotrichs; systematics; taxonomy; 18S rRNA gene
类别
资金
- National Key Research and Development Program of China [2018YFD0900701]
- National Natural Science Foundation of China [32030015, 31900319]
- China Postdoctoral Science Foundation [BX20180348, 2018M642955]
This study investigates a new hypotrich ciliate species from a freshwater fishpond based on morphological, morphogenetic, and molecular data. The phylogenetic analyses reveal a close relationship between the new species and Simplicitergida, leading to the proposal of a new family, Clampidae fam. nov.
Hypotrichs comprise a highly differentiated and diversified group of ciliates with an evolutionary history characterized by an exceptional number of convergences and reversions. A new hypotrich ciliate from a freshwater fishpond is investigated based on morphological, morphogenetic and molecular data. The phylogenetic analyses reveal that the new species is closely related to Simplicitergida despite the absence of zigzag-patterned midventral cirral pairs, a common feature of simplicitergids. The phylogenetic position of this atypical simplicitergid species is strongly supported by the conserved features of dorsal ciliature and nuclear apparatus, which are probably more informative than cirral patterns for higher-rank classification. The close phylogenetic relationships among those Simplicitergida with varied cirral patterns could be explained by evolutionary convergences and reversions. The new species is recognized mainly by three frontoventral rows, several short midventral rows, two long midventral rows and the absence of zigzag-patterned midventral cirral pairs. Based on comprehensive phylogenetic analyses, together with detailed morphological and morphogenetic comparisons, a new family, Clampidae fam. nov., is proposed for the new genus and species, Clampia sinica gen. et sp. nov. In addition, an emended diagnosis of the morphologically similar family Epiclintidae is provided.
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