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Caecidotea zullinii ArganoCaecidotea zullmii Argano, 1977:105.110, 112, 114,fig. 1-3; Ruffo and Vigna Taglianti, 1977:151.Type-Iocality.-Cueva de Chanchaniptic, Sitala,Chiapas, Mexico.Distrihution.-Known only from the type-locality.See Fig. 7.Discussion.-This species is a member of the chiapasspecies group and appears to be closely related toC. vomeroi. It was taken in association with Bogidiellavomeroi and troglobitic planaria.Family StenasellidaeThe family Stenasellidae is found in the peri­Mediterranean area, east-central Asia, tropical Africa,and Mexico. The appearance of the family in theCuatro Cienegas basin implies a pre-Tertiary originfor the family and provides a further link betweenthe peri-Mediterranean and greater Caribbean regions(Cole and Minckley, 1972). Magniez (1974a) has discussedthe evolution and ecology of the family. Hecontends that the stenasellids had their origin in thelittoral gravels, from which they migrated into the(//.//('GUATEMALA~'" r',--Fig. 7.-Distribution of troglobitic isopods of the suborder Asellota: 1,Mexistenasellus coahuila; 2,Mexistenasellus n. sp.l;3, Mexistenasellus n. sp. 2; 4, M. parzeJalli and M. wilkensi; 5, M. magniezi; 6, Caecidotea pasquinii; 7, Etlastenasellus n. sp.;8,E. mixtecus; 9, C. chiapas; 10, C. zullinii; 11, C. vomeroi; 12, C. mitchelli; 13, Caecidotea sp.89