New molecular and morphological analyses of the relationships of 77 specimens of potamonautid freshwater crabs collected from all parts of Madagascar support the monophyly of the island’s freshwater crab fauna and verify most of the existing taxa. The phylogenetic tree identified several new lineages that represent four new genera and 10 new species, and found Foza Reed & Cumberlidge, 2006 to be paraphyletic. The present work is the first of a series of articles reporting on these discoveries that provide an improved understanding of the relationships between the endemic potamonautid species found on this tropical island. We describe a new species of Malagasya Cumberlidge & Sternberg, 2002 from a phytotelmic habitat in northeast Madagascar, and establish Agoragen. nov. to accommodate Thelphusa goudoti H. Milne Edwards, 1853. Both of these new taxa are recognized based on combinations of morphological characters and molecular data. The new species of Malagasya is distinguished from the other two species of this genus, which are illustrated here for comparative purposes. Agora goudotin. comb. is endemic to Madagascar, and is compared with and distinguished from the eight other genera of freshwater crabs occurring in that country.

中文翻译：

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马达加斯加淡水蟹类动物的新谱系：Agora n。gen。代表Thelphusa goudoti H. Milne Edwards，1853年，以及马拉加（Malagasya Cumberlidge＆Sternberg）的植物新品种，2002年（Brachyura：Potamonautidae：Deckeniinae）

对从马达加斯加各地采集的77个波塔摩纳aut淡水蟹标本之间的关系进行了新的分子和形态学分析，为该岛的淡水蟹动物区系提供了单方面证据，并证实了大多数现有的分类单元。系统发育树确定了代表四个新属和十个新物种的几个新世系，并发现Foza Reed＆Cumberlidge，2006是共生的。本工作是报道这些发现的系列文章中的第一篇，这些文章提供了对该热带岛屿上发现的地方性potamonautid物种之间关系的更好理解。我们从马达加斯加东北部的植物检疫栖息地描述了马拉加斯（Malagasya Cumberlidge）和斯特恩伯格（Sternberg），2002年的新种，并建立了集市gen。十一月 来容纳Thelphusa goudoti H. Milne Edwards，1853年。这两种新的分类单元都是根据形态特征和分子数据的组合来识别的。马拉加（Malagasya）的新物种与该属的其他两个物种有所区别，此处出于说明目的进行了说明。阿戈拉goudoti ñ。梳。是马达加斯加特有的，并且与该国其他八类淡水蟹进行了比较和区别。