Blainville, 1834
Anterior nectophore with 2 dorsal and 2 lateral ostial teeth, although both may be reduced or, very occasionally, absent. Commissural canals present; bilobed mouth plate without protuberances. Long, sinuous somatocyst reaching one third to two fifths the height of the nectophore. Posterior nectophore with similar arrangement of ostial teeth. Deeply divided mouth plate with 2 protuberances, although these can be reduced or absent. The nectosac has two characteristic constrictions.