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Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Multilocus and mitogenomic phylogenetic analyses reveal a new genus and species of freshwater mussel (Bivalvia: Unionidae) from Guangxi, China

Yu-Ting Dai A , Xiao-Chen Huang https://orcid.org/0000-0002-0242-3571 A , Chen-Hui-Zi Wu A , Zhong-Guang Chen A , Liang Guo B , Feng-Yue Shu C , Shan Ouyang A and Xiao-Ping Wu https://orcid.org/0000-0002-8037-5640 A *
+ Author Affiliations
- Author Affiliations

A Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity, Center for Watershed Ecology, Institute of Life Science and School of Life Sciences, Nanchang University, Nanchang, 330031, PR China.

B Fuzhou Wilds of Insects Cultural Creativity Co., Ltd, Fuzhou, 350000, PR China.

C College of Life Sciences, Qufu Normal University, Qufu, 273165, PR China.

* Correspondence to: xpwu@ncu.edu.cn

Handling Editor: Gonzalo Giribet

Invertebrate Systematics 37(2) 152-166 https://doi.org/10.1071/IS22048
Submitted: 14 September 2022  Accepted: 16 February 2023   Published: 14 March 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Freshwater mussels are essential for the integrity of freshwater ecosystems but numbers of these organisms are declining rapidly at regional and global scales. The phylogenetic and biogeographic aspects of the rich unionoid fauna of the Indo-Burma region are becoming increasingly well understood. Guangxi is part of the Chinese portion of the Indo-Burma biodiversity hotspot but regional studies of the freshwater mussel diversity are scarce. In this study, we report a new genus and species of freshwater mussel from Guangxi, China. Genetic datasets including three genes (COI, 16S rRNA and 28S rRNA) and complete maternal mitogenomes were compiled to infer the phylogenetic history of the group. Molecular phylogenetic analyses showed that the new species formed a monophyletic group and was closely related to Obovalis and Ptychorhynchus in the tribe Gonideini of the subfamily Gonideinae. Morphological and molecular evidence supported that these specimens represent an undescribed genus and species that we describe as Postolata guangxiensis gen. nov., sp. nov. The discovery of this new taxon adds to the known level of endemism of freshwater mussels in Guangxi and a detailed survey of uncharted areas should reveal new diversity in the future. We also suggest that complete mitogenomes or even genome-scale nuclear data should be used for phylogenetic reconstructions when proposing major taxonomic changes.

ZooBank: urn:lsid:zoobank.org:pub:76FC5A1D-7507-4F26-A12C-EC08AB333274

Keywords: conservation, Gonideinae, Indo-Burma, integrative taxonomy, mitochondrial genome, molecular systematics, morphological characters, Unionidae.


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