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Type: Article
Published: 2020-07-22
Page range: 109–127
Abstract views: 74
PDF downloaded: 3

Vanmanenia intermedia Fang, 1935, a valid hill-stream species of loach (Teleostei: Gastromyzontidae) from the middle Yangtze River basin, Southwest China

The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei Province, China University of Chinese Academy of Sciences, Beijing 100049, China The Changjiang Civilization Museum (Wuhan Natural History Museum), Wuhan 430000, Hubei Province, China
The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, Hubei Province, China
Taxonomy specific status morphology cyt b gene phylogenetic analysis Pisces

Abstract

Vanmanenia intermedia, which has long been synonymized with V. pingchowensis since 1980, is here revalidated using morphological characters and molecular evidences, and redescribed on the basis of topotypic specimens. This species is distinguished from all other congeneric species by the following combination of characters: triangular-shaped rostral lobules without secondary rostral barbels; distal edge of dorsal-fin slightly concave; no longitudinal black stripe on the flank; a longer snout (length 52.6–64.5 % of HL); a more backwards-placed anus (the vent to anal distance 34.7–46.1% of the pelvic to anal distance); a slender caudal peduncle (depth 9.1–11.3 % of SL); a longer anal-fin base (length 7.5–9.5 % of SL); and a smaller gill opening with its upper extremity closer to the level of the lower margin of the orbit. The validity of V. intermedia is also confirmed by its significant cyt b gene sequence divergence with all sampled congeneric species and its monophyly recovered in the cyt b gene-based phylogenetic analysis.

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