A new species of Foleyellides (Nematoda: Onchocercidae) parasite of Lithobates spp. (Amphibia: Ranidae) from Mexico with a key for the species of the genus Author Romero-Mayén, Angeles R. Author León-Règagnon, Virginia text Zootaxa 2016 4170 3 581 586 journal article 10.11646/zootaxa.4170.3.10 b480d973-3100-4438-84d3-739d1258866c 1175-5326 268226 7D4EAC7A-4811-4D9D-82EF-99102950FE42 Key of the species of the genus Foleyellides spp. in the world 1 Cuticularized pre-cloacal plaque present................................................................... 2 1’ Cuticularized pre-cloacal plaque absent................................................................... 7 2 Unpaired pre-cloacal papillae present...................................................................... 3 2’ Unpaired pre-cloacal papillae absent......................................................................4 3 Body size larger than 11 mm .......................................................... Foleyellides flexicauda 3’ Body size smaller than 11 mm ........................................................ Foleyellides malayensis 4 With 4 pairs of caudal papillae............................................................ Foleyellides striatus 4’ With more than 4 pairs of caudal papillae.................................................................. 5 5 Right spicule larger than 400 µm...................................................... Foleyellides americana 5’ Right spicule smaller than 400 µm........................................................................ 6 6 7–8 pairs of caudal papillae............................................................... Foleyellides ranae 6’ 5 pairs of caudal papillae............................................................... Foleyellides rhinellae 7 Four pairs of caudal papillae............................................................................ 8 7’ More than 4 pairs of caudal papillae....................................................................... 9 8 Left spicule size 168–220µm........................................................ Foleyellides dolichoptera 8’ Left spicule size 100–120µm............................................................ Foleyellides duboisi 9 Five pairs of caudal papillae...................................................... Foleyellides mayenae n. sp. 9’ More than 5 pairs of caudal papillae..................................................................... 10 10 All pairs of caudal papillae post—cloacal.............................................. Foleyellides brachyoptera 10’ 2 pre-cloacal and 4 post-cloacal pairs of caudal papillae....................................... Foleyellides confusa