ZooKeys (Oct 2024)

A new species of Opsariichthys (Teleostei, Cypriniformes, Xenocyprididae) from Southeast China

  • Xin Peng,
  • Jia-Jun Zhou,
  • Hong-Di Gao,
  • Jin-Quan Yang

DOI
https://doi.org/10.3897/zookeys.1214.127532
Journal volume & issue
Vol. 1214
pp. 15 – 34

Abstract

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Opsariichthys iridescens sp. nov. is described from the Qiantang and Oujiang rivers in Zhejiang Province and a tributary of the Yangtze River adjacent to the Qiantang River. It is distinguished from congeners by the following combination of morphological features: no obvious anterior notch on the tip of the upper lip; 45–52 lateral-line scales; 18–21 pre-dorsal scales; two rows of pharyngeal teeth; a maxillary extending to or slightly beyond the vertical anterior margin of the orbit in adult males; a pectoral fin extending to the pelvic fin in adult males; nuptial tubercles on the cheeks and lower jaw of males, which are usually united basally to form a plate; uniform narrow pale pink cross-bars on trunk and two widening significantly on caudal peduncle. Its validity was also supported by its distinct Cyt b gene sequence divergence from all congeners and its monophyly recovered in a Cyt b gene-based phylogenetic analysis.