Lanlabeo duanensis, a new genus and species of labeonin fish (Teleostei: Cyprinidae) from southern China Author Yao, Min Author He, You Author Peng, Zuo-Gang text Zootaxa 2018 2018-09-06 4471 3 556 568 journal article 29466 10.11646/zootaxa.4471.3.7 cf0541cf-da9e-4125-a167-9b0ee0631484 1175-5326 1439948 38505C46-E1D6-4EB1-9300-5CBD8DEEEDA4 Lanlabeo , gen. nov. ( Figs. 2–3 ) Type species. Lanlabeo duanensis , sp. nov. Diagnosis. Lanlabeo is diagnosed from all other labeonin genera by the following combination of characters: 1) frenum connecting upper jaw and lower lip at corner of the mouth; 2) papillae densely scattered over ventral margin of rostral cap and regularly arranged; 3) upper lip vestigial; 4) rostral cap overlying upper jaw, with its posterior margin fimbriate; 5) lower lip divided into two small lateral and translucent fleshy lobes and one central plate; 6) median lobe of lower lip large, with papillae regularly arranged in many transverse rows ( Fig. 2 ). FIGURE 2. Oromandibular structures of Lanlabeo duanensis sp. nov. , SWU20170110006, 90.3 mm SL. Comparison. Among the described genera of Labeonini, the morphology of this new genus appears to most closely resemble that of Rectoris posehensis ( Lin 1935 ) . It distinctly differs from this genus, however, in having a pair of well-developed maxillary barbels and in its lower lip being divided into two small lateral and translucent fleshy lobes and one central plate. There are no known cyprinids with mouths of similar structure to that of the fish of this new genus. In the lower jaw of the new genus, the dentary is transversely L-shaped in ventral view, as the anterior part forms a right-angle turn and the transverse branch is anterioposteriorly expanded ( Fig. 4B ). These unique osteological characters can distinguish it from other known genera. Additionally, molecular analyses indicated that this new genus forms a distinct lineage within the Labeonini ( Fig. 5 ). Etymology. The generic name is made from a combination of the Chinese family name Lan , after Jiahu Lan for his contributions to the discovery of fish diversity in southern China , and the Latin word Labeo , a generic name commonly utilized suffix for the labeonin genera.