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Invertebrate Systematics Invertebrate Systematics Society
Systematics, phylogeny and biogeography
RESEARCH ARTICLE

Taxonomic reassessment of Scabies (Bivalvia: Unionidae) species in China based on multilocus and mitogenomic phylogenetic analyses

Yu-Ting Dai https://orcid.org/0009-0001-5856-3987 A # , Zhong-Guang Chen A # , Cheng-Lin Hu A , Peng-Fei Ning B , Shan Ouyang A , Xiao-Chen Huang https://orcid.org/0000-0002-0242-3571 A * and Xiao-Ping Wu https://orcid.org/0000-0002-8037-5640 A *
+ Author Affiliations
- Author Affiliations

A School of Life Sciences, Nanchang University, Nanchang, 330031, PR China.

B Fisheries Research Institute of Tianjin, Tianjin, 300221, PR China.

# These authors contributed equally to this paper

Handling Editor: Gonzalo Giribet

Invertebrate Systematics 38, IS24020 https://doi.org/10.1071/IS24020
Submitted: 27 February 2024  Accepted: 8 May 2024  Published: 17 June 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing.

Abstract

Effective species conservation necessitates the ability to accurately differentiate among species, a challenge compounded by taxonomic uncertainties in freshwater mussels due to substantial intraspecific variation and pronounced phenotypic plasticity in shell morphology. The taxonomic status and species validity of Scabies longata and S. chinensis, two species endemic in China, have been under continuous debate since establishment. The lack of essential molecular data required for a comprehensive systematic study has resulted in the unresolved taxonomic status of these two species. This study presents molecular data, including COI barcoding, COI + 28S rRNA, and mitogenomic data combined with morphological characteristics to assess the validity of S. longata and S. chinensis. Both morphological and COI barcoding data support the conclusion that S. longata and S. chinensis are junior synonyms of Nodularia douglasiae and N. nuxpersicae respectively. Our findings suggest the absence of Scabies species in China. Mitochondrial phylogenetic analyses were used to further elucidate intrageneric relationships within the genus Nodularia, revealing the following relationships: (N. breviconcha (Nodularia sp. 1 (N. douglasiae (N. nuxpersicae, N. nipponensis)))). We underscore the significance of employing an integrated taxonomic approach for species identification, especially given the considerable morphological disparities between larvae and adult freshwater mussels. Proper morphological identification of adult specimens is essential for extracting meaningful taxonomic characters. Furthermore, our findings suggest a notable resemblance between the freshwater bivalve fauna in southern China and those east of the Mekong River.

ZooBank: urn:lsid:zoobank.org:pub:DA87D330-5E23-4F4B-8CC2-CBA3CD191BE8

Keywords: comparator species, conservation, freshwater mussels, integrative taxonomy, mitochondrial phylogenomics, morphological characters, multilocus phylogeny, Nodularia.

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