Diagnosis: Theneidae with tetraxonic megascleres and without cladotyles.
Most of the taxonomy concerning Thenea has already been treated elsewhere (Steenstrup & Tendal 1982) so our description will mainly focus on new data. Our study will notably add new records, additional illustrations (external morphology and spicules) and discuss the molecular phylogenetic data now available for those species (Cárdenas et al. 2011).