Opis

Very long septal necks coming close to or even intruding the preceding septum; cylindrical, ventral siphuncle filled in its apical part with diaphragms and calcareous deposits of "cone-in-cone" structure (endocones).  The complete separation of the siphon from the chambers by the imperforate neck made cameral liquid exchange difficult, causing the absence of cameral deposits.

Synonimy
endocerasy

Zasięg czasowy

Literatura

Dzik, J. 1984. Phylogeny of the Nautiloidea. Palaeontologia Polonica 45, 1-255