Ontogenesis and systematic position of a new hypotrichous ciliate,Chaetospira sinica sp.nov.,with an improved diagnosis of the poorly defined family Chaetospiridae Jankowski,1985(Protozoa,Ciliophora,Hypotrichia)  

作　　者：Wenya Song Xiaotian Luo Yong Chi Saleh A.Al-Farraj Chen Shao 

机构地区：[1]Laboratory of Protozoological Biodiversity and Evolution in Wetland,College of Life Sciences,Shaanxi Normal University,Xi’an,710119,China [2]Institute of Evolution&Marine Biodiversity,Ocean University of China,Qingdao,266003,China [3]Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences,Institute of Hydrobiology,Chinese Academy of Sciences,Wuhan,430072,China [4]Zoology Department,College of Science,King Saud University,Riyadh,11451,Saudi Arabia

出　　处：《Marine Life Science & Technology》2022年第4期513-526,共14页海洋生命科学与技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.32030015,32070428;31900319);the National Key Research and Development Program of China(2018YFD0900701);the King Saud University,Saudi Arabia(No.RSP2022R7).

摘　　要：Ciliates are unique single-celled organisms that play important roles in ecological,environmental,evolutionary,and ontogenetic research.In the present study,phylogenetic analyses based on 18S rRNA gene sequence data reveal that Chaetospira sinica sp.nov.clusters with Stichotricha aculeata with strong to full support(97%ML,1.00 BI),but is not closely related to members of Spirofilidae Gelei,1929 to which Chaetospira and Stichotricha have previously been assigned.Phylogenetic analyses,together with morphological and morphogenetic data from Chaetospira sinica sp.nov.,support the validity of family Chaetospiridae Jankowski,1985.Chaetospira and Stichotricha are here assigned to the family Chaetospiridae,the improved diagnosis of which is as follows:non-dorsomarginalian Hypotrichia with flask-shaped body;oral region extending along narrow anterior neck region;lorica usually present;two ventral and two marginal cirral rows,all distinctly spiraled or obliquely curved;pretransverse and transverse cirri absent.The basic morphogenetic features in C.sinica sp.nov.can be summarized as:(1)the oral primordium for the opisthe develops de novo and the parental adoral zone is completely retained by the proter;(2)all ventral cirral anlagen and marginal anlagen developed intrakinetally;(3)three dorsal kineties anlagen formed intrakinetally in each daughter cell;and(4)macronuclear nodules fuse into a single mass.Exconjugant cells were also isolated and their morphologic and molecular data are provided.

关 键 词：18S rRNA gene MORPHOGENESIS Phylogeny Spirofilidae-Stichotricha 

分 类 号：Q95[生物学—动物学]