A NEW SPECIES OF CYPRINID FISH OF GENUS OPSARIICHTHYS FROM KY CUNG - BANG GIANG RIVER BASIN, NORTHERN VIETNAM WITH NOTES ON THE TAXONOMIC STATUS OF THE GENUS FROM NORTHERN VIETNAM AND SOUTHERN CHINA

摘要

Opsariichthys duchuunguyeni, a new species of cyprinid fish from Ky Cung - Bang Giang river basin, northern Vietnam, is described. It is characterized by the following unique combination of features: short maxillary extending; 12-15 rounded tubercles on lower jaw; 11-12 crossbars on body; pectoral fin reaching the pelvic fin origin in adult male; lateral-line scales comprising 41; scales above lateral-line 8; scales below lateral-line 3. Moreover, the genetic differentiation and a diagnostic key of the new species and other congeners are given in this paper for discussion about taxonomic status of the genus Opsariichthys from Vietnam and nearby geographical regions, southern China and Taiwan.