Does the Gonostomum-patterned oral apparatus in hypotrichia carry a phylogenetic signal?Evidence from morphological and molecular data based on extended taxon sampling using three nuclear genes(Ciliophora,Spirotrichea)  

作　　者：Jingyi Wang Yan Zhao Xiaoteng Lu Zhao Lyu Alan Warren 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]College of Life Sciences,Capital Normal University,Beijing 100048,China [3]Institute of Evolution&Marine Biodiversity,Ocean University of China,Qingdao 266003,China [4]College of Life Sciences,Northwest University,Xi’an 710069,China [5]Department of Life Sciences,Natural History Museum,London SW75BD,UK

出　　处：《Science China(Life Sciences)》2021年第2期311-322,共12页中国科学（生命科学英文版）

基　　金：supported by National Natural Science Foundation of China(31872190)。

摘　　要：The classification of hypotrichs based on the gonostomatid oral structure is widely accepted,but the phylogenetic signal of this character is unknown.Here,we infer the species phylogeny of those gonostomatids for which molecular data are available,plus26 new sequences of SSU-rDNA,ITS1-5.8 S-ITS2 and LSU-rDNA genes.The results indicate that:(i)the endoral is more phylogenetically informative than the paroral;(ii)the structure of the endoral and the Gonostomum-pattern adoral zone of membranelles are plesiomorphies for the hypotrichs sensu stricto;(iii)the group of species possessing these features is monophyletic in all our phylogenetic analyses,except that for the SSU-rDNA;(iv)Schmidingerotrichidae is monophyletic in all trees,suggesting that it is a well-defined family;(v)the Gonostomatidae is polyphyletic in the SSU-rDNA and ITS1-5.8 S-ITS2 trees,with Gonostomum,Cladotricha,Cotterillia,Metagonostomum,Paragonostomum and Wallackia distributed among separate clades,but monophyletic in the LSU-rDNA and concatenated trees;(vi)higher hypotrich taxa such as core urostyloids and core sporadotrichids/stichotrichids might have evolved from species that possessed a gonostomatid oral apparatus.

关 键 词：Gonostomatidae gonostomatid oral apparatus MULTIGENE PHYLOGENY Schmidingerotrichidae 

分 类 号：Q939[生物学—微生物学]