Formosaniaimmaculata, a new species of hillstream loach (Teleostei, Cypriniformes, Gastromyzontidae) from the Ou-Jiang River, Southeast China

Wei Sun; Jia-Jun Zhou; Jin-Quan Yang

doi:10.3897/zookeys.1182.104240

Formosaniaimmaculata, a new species of hillstream loach (Teleostei, Cypriniformes, Gastromyzontidae) from the Ou-Jiang River, Southeast China

Zookeys. 2023 Oct 16:1182:207-221. doi: 10.3897/zookeys.1182.104240. eCollection 2023.

Authors

Wei Sun¹, Jia-Jun Zhou^{2

3}, Jin-Quan Yang¹

Affiliations

¹ Shanghai Universities Key Laboratory of Marine Animal Taxonomy and Evolution, Shanghai Ocean University, Shanghai 201306, China Shanghai Ocean University Shanghai China.
² Zhejiang Forest Resource Monitoring Center, Hangzhou 310020, China Zhejiang Forest Resource Monitoring Center Hangzhou China.
³ Zhejiang Forestry Survey Planning and Design Company Limited, Hangzhou 310020, China Zhejiang Forestry Survey Planning and Design Company Limited Hangzhou China.

Abstract

Formosaniaimmaculata, a new species, is described from the Ou-Jiang basin in Zhejiang Province, Southeast China. It is distinguished from other species of the genus by having a combination of the following characteristics: body without obvious mottling; snout length longer than postorbital length; abdominal scaleless area extending to middle of pectoral-fin base; shorter rostral barbels, the outermost pair length 112.9%-140.0% of eye diameter; and shorter lower lip papillae, length 19.9%-24.4% of eye diameter. Its validity is also affirmed by its distinct Cytb gene sequence divergence from all congeners and its monophyly recovered in a Cytb gene-based phylogenetic analysis.

Keywords: cytochrome b; freshwater fish; key; molecular phylogeny; morphology; taxonomy.

Wei Sun, Jia-Jun Zhou, Jin-Quan Yang.