First records of Bathytoshia brevicaudata (Hutton, 1875) (Myliobatiformes, Dasyatidae) from China with mitogenomic evidence

By

Chen, Jiajie
Chen, Jiang-Yuan
Guo, Xing-Le
Zeng, Sheng
Yang, Deyuan
Zhou, Junsheng
Zhao, Shen-Long
Fang, Wen-Hong
Chen, Jian
Liu, Pan

Type

Article

Date of Publication

2025-11-17

Original Publication

Zoosystematics and evolution

Volume

101

Series / Issue

Issue: 4

Pages

2191--2205

Subjects

Hainan Island , mitochondrial genome , mitochondrial genome , mitochondrial genome , mitochondrial genome , mitochondrial genome , phylogenetic analysis , South China Sea , Taxonomic key

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia Pensoft

Identifiers

DOI: https://doi.org/10.3897/zse.101.164102

 

Abstract

<br> This study presents the first records of the Broad-tail Stingray,<br> Bathytoshia brevicaudata<br> (Hutton, 1875), in the East China Sea, significantly extending its known distribution in the Northwest Pacific. Through comprehensive morphological examination of male and female specimens, we identified several sexually dimorphic traits, including the number of oral papillae rows, dorsal tubercle spines, and tooth cusp morphology. Stomach content analysis revealed predation on teleosts exceeding 30 cm total length, challenging previous dietary descriptions. Furthermore, the co-occurrence of distinct fishing hook types (coastal J-hook and pelagic circle hook) within one specimen provides empirical evidence of transboundary movements between neritic and oceanic zones. We also sequenced and characterized the complete mitogenomes of both sexes (17,640 bp; GenBank: PV699610–PV699611), which exhibited conserved dasyatid genomic features, including pronounced AT bias (59.2%), purifying selection across protein-coding genes (strongest in<br> cox2<br> ), and structural traits such as an incomplete stop codon in<br> ND4<br> and a DHU-arm-deficient<br> trnS1<br> . These integrative findings enhance the ecological and molecular understanding of<br> B. brevicaudata<br> and provide critical baseline data for its conservation in poorly studied regions of the Indo-Pacific.<br>