Cosmocercoides meridionalis n. sp. is described from the large and small intestines of 5 species of tree frogs belonging to the families Hylidae and Phyllomedusidae collected from 2 localities in Southern Amazonia. The new species is allocated to the genus Cosmocercoides Wilkie, 1930, due to the presence of papillae in rosettes, which are complex caudal papillae surrounded by punctuations. Cosmocercoides meridionalis n. sp. differs from its congeners by a combination of the following characters: the absence of the gubernaculum, the total length of the female (twice the size of the male), and the presence of 26 rosette papillae with a unique arrangement and distribution pattern: 11 pre-cloacal pairs, 1 ad-cloacal pair, and 1 post-cloacal pair. This is the first species of the genus described from the Amazonia region.

Cosmocercoides鲇ñ。sp。从在南亚马逊州2个地方收集的5种树蛙的大肠和小肠中进行了描述，这些树蛙属于Hylidae和Phyllomedusidae科。 由于玫瑰花结中存在乳头，这些新物种被分配到Cosmocercoides Wilkie属中，乳头是复杂的尾标状乳头，周围有标点符号。子午线虫。sp。它与同类物的不同之处在于以下特征的组合：缺少古柏，雌性的总长度（雄性的两倍），以及存在26种具有独特排列和分布方式的莲座乳突：11 pre -泄殖腔对，1个泄殖腔对和1个泄殖腔后对。这是从亚马逊地区描述的第一属。