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A new rare species of the Rhadinaeadecorata group from the Sierra Madre del Sur of Guerrero Mexico (Squamata Colubridae)

机译:来自墨西哥格雷罗山脉的马德雷德尔苏尔山脉Rhadinaeadecorata群的一种新稀有物种(SquamataColubridae)

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摘要

A new species of the Rhadinaeadecorata group is described based on two specimens from the Sierra Madre del Sur, Guerrero, Mexico. The new species differs from all other members of the genus Rhadinaea by having: eight supralabials; 149–151 (male) ventrals; 63–77 (male) subcaudals; two large pale nuchal blotches, forming an incomplete collar that occupies two scales laterally and is bissected along the dorsal midline; a postocular pale marking consisting of a well-defined, narrow line beginning behind the upper posterior margin of the eye and extending posteriorly nearly horizontally until connecting with the nuchal blotches; and the dark ground color of the flanks extending to the lateral portion of the ventrals. The large nuchal blotches distinguish the new species from the other members of the R.decorata group, except for R.cuneata and some individuals of R.hesperia (pale nuchal marking one-scale wide in R.marcellae, absent in the other species). The condition of the postocular pale marking distinguishes it from R.cuneata and R.hesperia (postocular pale marking wedge-shaped in R.cuneata, not connected with the pale post-cephalic markings in R.hesperia). Furthermore, the number of subcaudals and the coloration of the lateral portion of the ventrals distinguish it from R.omiltemana and R.taeniata, the remaining congeners found in Guerrero (85–90 in males of R.omiltemana and 91–121 in R.taeniata; dark color of the flanks not reaching ventrals in the former species, occasionally and faintly in R.taeniata). Additionally, a new combination for R.stadelmani is proposed. The new species is the first described in the genus Rhadinaea in more than 40 years.
机译:根据墨西哥格雷罗州Sierra Madre del Sur的两个标本描述了Rhadinaeadecorata组的新物种。该新物种与Rhadinaea属的所有其他成员有所不同,它们具有:八个剑腹; 149–151(男性)腹侧; 63-77(雄)次sub;两个巨大的浅色颈部干斑,形成一个不完整的项圈,该项圈横向占据两个比例,并沿背中线一分为二;眼后苍白痕迹,由清晰可见的细线组成,从眼睛的上后缘后方开始,并向后几乎水平延伸,直至与颈部斑点连接。侧面的深色底色延伸到腹侧部。巨大的颈部斑点使新物种与R.decorata组的其他成员区分开,除了R.cuneata和 R. “ persperia” (在 R 。 marcellae (其他物种中不存在)。眼后苍白标记的状况使其与 R。 cuneata 区别开来。 R。 荷兰芹 < / em> (在 R。 ,它与 R。中的苍白的后脑标志无关。 > 荷兰芹 )。此外,亚尾骨的数目和腹侧部的颜色使它与 R区别。 omiltemana R。 taeniata ,在格雷罗发现了其余同类物( R。 omiltemana R。 taeniata ;在前一种物种中,侧面的深色未到达腹面,在< em> R。 taeniata )。此外, R。 stadelmani 的新组合。该新物种是40多年来首次在 Rhadinaea 属中描述的物种。

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