Morphological and molecular examination of the ciliate family Lagynusidae(Protista,Ciliophora,Prostomatea)with descriptions of two new genera and two new species from China  

作　　者：Limin Jiang Congcong Wang Saleh A.Al-Farraj Hunter N.Hines Xiaozhong Hu 

机构地区：[1]College of Fisheries,and Key Laboratory of Mariculture,Ministry of Education,Ocean University of China,Qingdao 266003,China [2]Institute of Evolution and Marine Biodiversity,Ocean University of China,Qingdao 266003,China [3]Department of Zoology,College of Science,King Saud University,Riyadh 11451,Saudi Arabia [4]Harbor Branch Oceanographic Institute,Florida Atlantic University,Fort Pierce,FL 34982,USA

出　　处：《Marine Life Science & Technology》2023年第2期178-195,共18页海洋生命科学与技术（英文）

基　　金：This work was supported by the National Natural Science Foundation of China(project numbers:42276094,41976086);Researchers Supporting Project Number(project number:RSP2023R10)King Saud University,Riyadh,Saudi Arabia.We are grateful to Prof.Weibo Song(OUC,China)and Dr.Brandon Kwee Boon Seah(Max Planck Institute for Biology,Tübingen,Germany)for their suggestions while drafting the manuscript.

摘　　要：Ciliates in the class Prostomatea play an important role in the global microbial loop due to their signifcant abundances and broad feeding strategies at the foundation of food webs.Despite their importance in ecosystems,the taxonomy and systematics of this group of ciliates has long been poorly understood,with this being especially true for members of the family Lagynusidae.Here we examine four lagynusids collected from sandy beaches in China,using silver-staining and 18S rRNA gene sequencing techniques.These investigations revealed two new genera and two new species and provided details for two little known forms:Penardella marina gen.nov.,sp.nov.,Apolagynus cucumis(as reported by Penard.Études sur les infusoires d’eau douce.Georg and Cie,Genève,1922)gen.nov.,comb.nov.,Lagynus minutus sp.nov.,and Lagynus elegans(Engelmann in Z Wiss Zool 11:347-393,1862)Quennerstedt(Acta Univ Lund 4:1-48,1867).Penardella gen.nov.can be morphologically distinguished by having more than three dikinetidal perioral kineties.Apolagynus gen.nov.difers from the closely related genus Lagynus in the absence of a conspicuous neck-like region.The ciliature of Apolagynus cucumis is revealed here for the frst time,which demonstrates the classifcation of this species within Lagynusidae.Furthermore,Apolagynus binucleatus(Jiang et al.,2021)comb.nov.is established according to the new fnding.The results of our phylogenetic analyses based on the 18S rRNA gene support the establishment of two new genera and indicate that Lagynusidae is monophyletic,which further strengthens its valid taxonomic status.

关 键 词：CILIATE Morphology New genus New species PHYLOGENY 18S rRNA gene 

分 类 号：Q958.8[生物学—动物学]