Type species. Coloboceras koehleri Trouessart, 1896.
Female. GP and AP fused. GA with three pairs of slender pgs but without sgs. Three pairs of internal gac arranged in line (Bartsch 1998 a: fig. 17). Shape of ovipositor and genital spines not known. Epimeral pores lacking.
Male and juveniles. Not known.
Remarks. Records of the two species described are from the northern and southern Atlantic Ocean. Because of the very slender, pointed rostrum, flanked by elongate palps, and the large pharyngeal plate, these species are expected to attach themselves to macrofauna and feed on body fluids (Bartsch 1998 a).