Canseco-mÁrquez Luis, RamÍrez-gonzÁlez Cynthia G, Campbell Jonathan A
Departamento de Biología Evolutiva, Museo de Zoología, Facultad de Ciencias, UNAM, AP 70-399 México, DF 04510, México.
Zootaxa. 2018 Mar 21;4399(2):151-169. doi: 10.11646/zootaxa.4399.2.1.
Chersodromus is an endemic Mexican genus of snakes characterized by fused prefrontals shield. Only two species were previously known within the genus, C. liebmanni and C. rubriventris. We describe two new congeners, one from the Sierra Madre Oriental of northern Puebla and another from the Atlantic lowlands of the Chimalapas region in southeastern Oaxaca. These new species can be clearly differentiated on the basis of their morphology. Diagnostic characters distinguishing congeners include the number of dorsal scale rows, supralabials, and infralabials contacting anterior chinshields; whether or not the mental contacts the first pair of chinshields; and the coloration of the belly. We provide hemipenal descriptions of three species for which males are known.
切索德罗姆斯蛇属是墨西哥特有的蛇类属，其特征是前额盾片融合。该属此前仅知有两个物种，即利氏切索德罗姆斯蛇和红腹切索德罗姆斯蛇。我们描述了两个新的同属物种，一个来自普埃布拉州北部的东马德雷山脉，另一个来自瓦哈卡州东南部奇马拉帕斯地区的大西洋低地。这些新物种在形态上可以明显区分。区分同属物种的诊断特征包括背鳞行数、上唇鳞、与前颏片接触的下唇鳞数量；颏片是否与第一对颏片接触；以及腹部的颜色。我们提供了已知雄性的三个物种的半阴茎描述。
