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| (A) Claea dafangensis Wang, Luo & Zhou, sp. nov. (F) Habitat of C. dafangensis sp. nov. (B) C. dabryi (E) C. scet (Lei et al. 2025). in J.-J. Wang, Luo, M.-Y. Xiao, Xie, Y.-L. Wang, Deng, N. Xiao et Zhou, 2026. |
Abstract
A new species of the genus Claea, Claea dafangensis sp. nov., is described from Yuchong Township, Dafang County, Guizhou Province, China. This species can be distinguished from its four congeners by a combination of the following characteristics: body pigmentation present; normal eyes with a diameter of 10.9–21.0% of head length (HL); processus dentiformis prominent, covering the lower jaw when the mouth is shut; 8–9 branched pectoral-fin rays; 16 branched caudal-fin rays; caudal-peduncle depth 6.1–8.7% of standard length (SL); interorbital width 23.6–39.0% HL; tip of maxillary barbel reaching the posterior margin of the eyes; outrostral barbel extending backward beyond the anterior nostrils; and anal-fin base length 4.0–5.5% SL. Mitochondrial Cyt b analysis further supports the distinctiveness of this population, revealing that it forms an independent phylogenetic lineage with a minimum genetic distance of 2.6% from C. wulongensis. The description of this new species suggests that Claea dabryi represents a species complex containing multiple distinct lineages, the diversity of which requires further evaluation.
Key Words: Mitochondrial, morphology, taxonomy, Wujiang basin
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| Holotype GZNU20241204001 (A–K) of Claea dafangensis sp. nov. in preservative. (A) Lateral view. (B) Dorsal view. (C) Ventral view. (D) Dorsal-fins view. (E) Anal-fins view. (F) Pectoral-fins view. (G) Pelvic-fins view. (H) Dorsal view of head. (I) Lateral view of head. (J) Ventral view of head. (K) Anterior chamber and posterior chamber. (Cephalic lateral line system highlighted as yellow dots) |
Claea dafangensis Wang, Luo & Zhou, sp. nov.
Diagnosis. Comparative data between new species and all four known species within the genus Claea are provided in Table 3. Claea dafangensis sp. nov. can be distinguished from C. scet by the processus dentiformis prominent, covering lower jaw when mouth shut (vs.reduced, not covering lower jaw when mouth shut), body pigmentation present (vs. reduced), eyes normal, with diameter 10.9–21.0% of head length (HL) (vs. eyes reduced, 3.8–5.9% HL); from C. minibarba by tip of maxillary barbel reaching the posterior margin of eyes (vs. extending to the middle of eye), 8–9 branched pectoral-fin rays (vs. 10), and caudal-peduncle depth 6.1–8.7% SL (vs. 9.5–11.7%); from C. wulongensis by tip of maxillary barbel reaching the posterior margin of eye (vs. extending to ansterior margin of eye), 16 branched caudal-fin rays (vs. 18), and interorbital width 23.6–39.0% HL (vs. 38.5–43.1%); from C. dabryi (Fig. 6) by outrostral barbel backward extending beyond the anterior nostrils (vs. reaching or beyond to ansterior margin of eye), tip of maxillary barbel reaching the posterior margin of eye (vs. beyond the posterior margin of eye), and anal fin base length 4.0–5.5% SL (vs. 2.8–3.4%).
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| Lateral view of species in the genus Claea during life and the habitat of the new species. (A) Claea dafangensis sp. nov. (B) C. dabryi (C) C. wulongensis (Chen et al. 2021). (D) C. minibarba (Zhang et al. 2024). (E) C. scet (Lei et al. 2025). (F) Habitat of Claea dafangensis sp. nov. |
Etymology. The specific epithet “dafangensis” refers to the type locality of the new species, distributed in Dafang County. We propose the common English name “Dafang mountain loach” and the Chinese name “Dà Fānɡ Shān Qīu (大方山鳅).”
Jia-Jia Wang, Tao Luo, Ming-Yuan Xiao, Xin Xie, Yu-Ling Wang, Huai-Qing Deng, Ning Xiao and Jiang Zhou. 2026. Claea dafangensis (Cypriniformes, Nemacheilidae), A New Cave-dwelling Fish from the upper Wujiang River, Guizhou Province, China. Zoosystematics and Evolution. 102(2): 519-531. DOI: doi.org/10.3897/zse.102.172325 [26 Mar 2026]