Billibathynella Cho, 2005

Hong, Sungwon J. & Cho, Joo-Lae, 2009, Three new species of Billibathynella from Western Australia (Crustacea, Syncarida, Parabathynellidae), Journal of Natural History 43 (37 - 38), pp. 2365-2390 : 2366

Genus Billibathynella Cho, 2005

Revised diagnosis

Parabathynellidae body elongated and cylindrical. Antennule seven-segmented. Antenna seven-segmented. Labrum flat with numerous teeth on free margin. Molar process of mandible with more than five spines. Mandibular palp three times as long as wide. Maxilla four-segmented. Thoracopods I–VII with exopod of more than five segments. Male thoracopod VIII almost rectangular, longer than wide; protopod protruded at inner distal corner; epipod large, triangular, its distal part covering penial region of protopod; basipod without setae, inner margin of basipod drawn out into projection. Uropod with numerous spines on sympod; endopod with one or two distal spines, two plumose setae near base, three distal setae and a protrusion on disto-outer margin, inner spines variable in number; exopod with numerous setae. Anal operculum flat to slightly concave. Furcal rami elongated, with two large distal spines and numerous spines on inner margin.