Cardoso Giovanna Monticelli, Bastos-Pereira Rafaela, Souza Leila Aparecida, Ferreira Rodrigo Lopes
Universidade Federal de Lavras (UFLA), Centro de Estudos em Biologia Subterrânea, Departamento de Biologia. Programa de Pós-graduação em Ecologia Aplicada. Lavras, Minas Gerais, Brasil..
Zootaxa. 2020 Jul 22;4819(1):zootaxa.4819.1.4. doi: 10.11646/zootaxa.4819.1.4.
In the present work, five new species of Xangoniscus are described, increasing to eight the number of the known troglobitic species for the genus. Xangoniscus species can be distinguished from each other by the shape of pleonites epimera, the number and size of aesthetascs in the distal article of antennula, the modifications on pereopods, the shape of male pleopods and the proportion between uropod rami. Species from this genus are known for the states of Minas Gerais and Bahia with Xangoniscus aganju representing the northernmost occurrence, and X. lundi n. sp. and X. dagua n. sp. the southernmost occurrences. Of the six caves where specimens were collected, four are not registered in the national speleological database, what points to all the potential to yet be discovered regarding number of cavities and the associated biodiversity in Brazil. Some of the here mentioned type localities are not located inside protected areas, therefore exposing the species to risks related to the adjacent land use and consequent influence on water table level and input of food resources. The contribution of this work with descriptions of new troglobitic species provides support to consider them as plausible candidates to be assessed in the next list of threatened species as well as to elaborate conservation actions for the species, the caves where they inhabit and the surrounding landscape.
在本研究中，描述了5个新的桑戈尼斯属物种，使该属已知洞穴物种的数量增加到8个。桑戈尼斯属物种可以通过 pleonites epimera 的形状、触角小肢远端节上感觉毛的数量和大小、步足的形态变化、雄性腹足的形状以及尾足分支之间的比例相互区分。该属的物种在米纳斯吉拉斯州和巴伊亚州有分布，其中阿甘朱桑戈尼斯是最北端的分布种，而伦迪桑戈尼斯新种和达瓜桑戈尼斯新种是最南端的分布种。在采集标本的6个洞穴中，有4个未被列入国家洞穴学数据库，这表明巴西在洞穴数量和相关生物多样性方面仍有很大的发现潜力。这里提到的一些模式产地不在保护区内，因此这些物种面临着与相邻土地利用相关的风险，以及随之而来的对地下水位和食物资源输入的影响。这项对新洞穴物种进行描述的工作有助于将它们视为下一批受威胁物种评估的合理候选对象，并为这些物种、它们栖息的洞穴以及周围景观制定保护措施提供支持。
