Distribution update, conservation status and color in life of the rare Amazonian snake, Eutrachelophis papilio Zaher and Prudente 2019 (Serpentes: Xenodontini)

ABSTRACT The rare Amazonian snake Eutrachelophis papilio is known from only five individuals, from four localities, belonging to its type-series, the more recent collected over 10 years ago. Here, we expand its distribution and describe its color in life for the first time. We also provide an estimate of its distribution area using the minimum convex polygon method and identify the values of anthropic pressure within its known distribution range with the Human Footprint Index. The new occurrence is located 291 km from the nearest known locality and its distribution is associated with pristine forests. Considering its rarity, and the absence of demographic and biological data, we suggest that the species should be classified as Data Deficient by IUCN criteria.

摘要 稀有亚马孙蛇类Eutrachelophis papilio目前仅记录有5号标本，采集自4个分布点，均隶属于其模式系列标本，其中最晚的标本采集于10余年前。本研究首次拓展了该物种的分布范围，并对其活体体色进行了描述。同时，本研究采用最小凸多边形法（minimum convex polygon method）估算了该物种的分布区面积，并通过人类足迹指数（Human Footprint Index）分析了其已知分布范围内的人为干扰压力水平。本次新发现的分布点距最近的已知分布点直线距离达291公里，该物种的分布与原生林密切相关。鉴于该物种极为稀有，且目前缺乏种群统计与生物学相关数据，我们建议依据国际自然保护联盟（IUCN）的评估标准，将其归类为数据缺乏（Data Deficient）等级。