Genus Gnathia Leach, 1814

Types species: Gnathia termitoides Leach, 1814; see Cohen & Poore (1994).

Diagnosis. Eyes usually present. Frontal margin of cephalon generally transverse, with frontal processes. Mandibles usually with dentate mandibular blade and mandibular incisor. Cephalon may possess paraocular ornamentation and/or dorsal sulcus. Pereonite 1 immersed in cephalon. Pylopod 2- or 3 articled: operculate, article 1 enlarged, generally with dense external margin of plumose setae: article 3 small or absent (from Cohen & Poore 1994).

Remarks. At present this large genus holds 127 species (Boyko et al. 2008 onwards), with numerous species in Australian waters.