| abstract | Larvae and adults of Mamersellides costenius sp.nov., from Mexico and Florida, USA, are described. The rsulting new morphological data are incorporated into revised diagnosis for the genus Mamersellides, the subfamily Anisitsiellinae, and the family Anisitsiellidae. Preliminary assessment of character states exhibited by larvae and adults of Mamersellides and other genera of Lebertioidea, and by those of genera of the family Limnesiidae, suggests that a comprehensive cladistic analysis would provide a phylogenetic basis for extensive revision of the classification of these mites. |