Diagnosis
provided by World Register of Marine Species
Original diagnosis by Foster (1969: 383): ''Prostomium triangular, flared anteriorly, lacking frontal horns, bearing two pairs of eyes. Peristomium fused with setiger one surrounding prostomium posteriorly as a yoke or collar; with no lateral wings or elevations. Four pairs of branchiae beginning on setiger two; first three pairs cirriform, fourth pinnate. Neuropodial lamellae of setiger two somewhat enlarged, triangular, directed ventrally. Pygidium with anal cirri. Hooded hooks in posterior neuropodia and notopodia; bidentate or multidentate. Dorsal membranous ridges connecting notopodial lamellae at some point along the body.''
