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Phylogenomic analyses shed light on the relationships of chiton superfamilies and shell‑eye evolution

Marine Life Science & Technology 2023年第4期5卷 525-537页

作者： Xu Liu Julia D.Sigwart Jin Sun Key Laboratory of Evolution&Marine Biodiversity(Ministry of Education)and Institute of Evolution&Marine Biodiversity Ocean University of ChinaQingdao 266003China Laoshan Laboratory Qingdao 266237China Department of Marine Zoology Senckenberg Research Institute and Natural History Museum Frankfurt60325 Frankfurt Am MainGermany

Mollusca is the second-largest animal phylum with over 100,000 extant species representing eight *** 1000 extant species in the class Polyplacophora,chitons have a relatively constrained morphology but with some notable *** genera possess“shell eyes”,i.e.,true eyes with a lens and retina that are embedded within the dorsal *** phylogeny of the major chiton clades is mostly well established,in a set of superfamily-level and higher level taxa supported by various approaches,including morphological studies,multiple gene markers,mitogenome-phylogeny,and phylotranscriptomic ***,one critical lineage has remained unclear,namely Schizochiton which was controversially suggested as being the potential independent origin of chiton shell ***,with the draft genome sequencing of Schizochiton incisus(superfamily Schizochitonoidea)plus assemblies of transcriptome data from other polyplacophorans,we present phylogenetic reconstructions using both mitochondrial genomes and phylogenomic approaches with multiple *** found that phylogenetic trees from mitogenomic data are inconsistent,reﬂecting larger scale confounding factors in molluscan ***,a consistent and robust topology was generated with protein-coding genes using diﬀerent models and *** results support Schizochitonoidea as the sister group to other chitonoidea in chitonina,in agreement with the established classiﬁ*** with evidence from fossils,our phylogenetic results suggest that the earliest origin of shell eyes is in Schizochitonoidea,and that these structures were also gained secondarily in other genera in *** results have generated a holistic review of the internal relationship within Polyplacophora,and a better understanding of the evolution of Polyplacophora.

关键词： chiton Mollusca Phylogenomics Polyplacophora Shell eyes

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Report of a chiton in the genus Leptochiton (Lepidopleurida:Lepidopleurina:Leptochitonidae) from the Yap Trench in the West Pacific Ocean

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Acta Oceanologica Sinica 2018年第10期37卷 205-208页

作者： WANG Chunsheng ZHOU Yadong JIANG Dan HAN Jie Key Laboratory of Marine Ecosystem and Biogeochemistry Second Institute of OceanographyState Oceanic Administration Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering College of Life SciencesBeijing Normal University

Two chiton specimens were collected from sedimentary habitat by China＇s manned Jiaolong submersible diving to a depth of 6 754 m in the north of the Yap Trench. This is a new locality record for chiton. Both morphological and molecular data support that the two specimens are the same species belonging to the genus Leptochiton. Morphologically, this species strongly resembles L. vanbellei and L. deforgesi. Phylogenetically, it has a close evolutionary relationship with L. vanbellei, L. deforgesi and L. boucheti. This is the third deepest record for deepsea chitons so far.

关键词： chiton Leptochiton the West Pacific Ocean the Yap Trench

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