系统进化与生物地理学（杨君兴）知识库

Zuojiangia jingxiensis, both a new genus and species, is described from the Pearl River inChina. It is distinguished from all other genera and species of Labeonini by the unique com-bination of modified oromandibular structures and head skeleton: a well-developed, pendu-lous, and conspicuously arched rostral fold, with an entirely crenulated margin; prominentpapillae densely covering the margin of the rostral fold and anterior part of the lower lip; longpostlabial grooves, partitioning the lower lip into three parts; transverse branch of dentarylonger than half the length of the longitudinal branch; stubby lateral process present at theanterolateral margin of the longitudinal branch of the dentary, close to the corner; in theupper jaw, the premaxilla bears a triangular ascending process tapering to a point; maxillaexhibits a pair of articular heads at the anterodorsal margin, and a distinct fingerlikedescending process posterior to the medial articular head embracing the ascending processof the premaxilla.