Findings on three endocommensal scuticociliates(Protista,Ciliophora)from freshwater mollusks,including their morphology and molecular phylogeny with descriptions of two new species  

作　　者：Tao Li Tengyue Zhang Mingjian Liu Zhe Zhang Jiachen Zhang Junhua Niu Xiangrui Chen Saleh A.Al‑Farraj Weibo Song 

机构地区：[1]Institute of Evolution and Marine Biodiversity,Ocean University of China and Key Laboratory of Evolution and Marine Biodiversity(Ministry of Education),Qingdao 266003,China [2]The Key Laboratory of Zoological Systematics and Application,College of Life Sciences,Hebei University,Baoding 071002,China [3]College of Marine Life Sciences,Ocean University of China,Qingdao 266003,China [4]School of Marine Sciences,Ningbo University,Ningbo 315800,China [5]Zoology Department,College of Science,King Saud University,11451 Riyadh,Saudi Arabia [6]Laboratory for Marine Biology and Biotechnology,Laoshan Laboratory,Qingdao 266237,China

出　　处：《Marine Life Science & Technology》2024年第2期212-235,共24页海洋生命科学与技术（英文）

基　　金：supported by the National Natu-ral Science Foundation of China(Project Nos.32030015,32100404,32000300,32070432);the Natural Science Foundation of Shandong Province(Project No.ZR2021QC045);the King Saud University,Saudi Arabia(Project No.RSP2024R7).

摘　　要：Species of the ciliate genera Myxophyllum and Conchophthirus are found as endocommensals of terrestrial and freshwater mollusks,respectively.So far,there have been few studies of these genera and morphological data for most members are often incomplete.In the present work,two new species,Myxophyllum weishanense sp.nov.and Conchophthirus paracurtus sp.nov.,and a known species,Conchophthirus lamellidens,were isolated from hosts in Lake Weishan Wetland,China.Taxonomic studies indicate that M.weishanense sp.nov.can be recognized mainly by the combination of about 60 somatic kineties on both ventral and dorsal sides and the presence of caudal cilia.Conchophthirus paracurtus sp.nov.differs from congeners in its body shape and size,having a glabrous area on the posterior right side,and having fewer somatic kineties.In addition,differences in their ITS2(Internally Transcribed Spacer 2)secondary structures support the discrimination of the two new species from their highly similar congeners.An improved diagnosis for the poorly known species,C.lamel-lidens is also provided.Phylogenetic analyses reveal that members of the genus Myxophyllum belong to a fully supported clade that is sister to a large,poorly supported clade consisting of Hemispeiridae,Ancistridae,and several lineages of the nonmonophyletic Cyclidiidae.The Myxophyllum clade also includes Protophyra ovicola JQ956552,a possible misidenti-fication.Sequences of the two new Conchophthirus species cluster with other congeners in a fully supported clade that is unrelated to either the‘typical’thigmotrichs or to pleuronematids,thus conflicting with the traditional classification,and may represent an orphan scuticociliate lineage.

关 键 词：CILIATES Endocommensal ITS2 secondary structure Mollusks New taxa Wetland 

分 类 号：Q95[生物学—动物学]