Moser, 1925
Anterior nectophore with 5 straight, complete longitudinal ridges; small nectosac and hydroecium restricted to central half. Somatocyst thick and slanting basally, with a narrow apical canal extending to close to the apex of the nectophore. Posterior nectophore not described and possibly not developed. Pyramidal bract whose phyllocyst resembles the somatocyst of the anterior nectophore. The two species in this genus are very similar in basic form. However, Moser (1925) initially separated the species into separate genera, the other being Thalassophyes Moser, 1925. Totton (1965) pointed out that they were probably congeneric but retained the two genera, while Margulis (1988) went as far as synonymising them as a single species. The latter is clearly not the case, but the two species are here treated as congeneric.
Heteropyramis crystallina
Heteropyramis maculata