+ Ophichthus retrodorsalis Liu, Tang & Zhang, 2010

Ophichthus retrodorsalis Liu, Tang & Zhang, 2010:332, fig. 191 (type locality: Fuzhou City, Fujian Province, southeastern China).

Remarks. Previously known only from the holotype collected from southeastern China. A specimen (NMMB- P28996) was collected from southwestern Taiwan off Ke-tzu-liao recently. The species is identified as Ophichthus retrodorsalis by having dorsal-fin origin about 1.5 pectoral-fin length behind tip of fin; two small barbels on upper jaw; two preopercular pores; four supraorbital pores; 3‒4 rows of granular teeth on vomer and jaws; and its coloration. However, there is some difference in the arrangement of jaw teeth, and more specimens are needed to document the variation in this species. The granular teeth on the jaws may also indicate that this is a species of Pisodonophis, rather than Ophichthus, as presently classified.