Opis

Kołnierzyki syfonalne dłuższe od komór powietrznych fragmokonu

Diagnosis. - Very long septal necks coming close to or even intruding the preceding septurn;
cylindrical, ventral siphuncle filled in its apical par t with diaphragms and/or calcareous deposits
of "cone-in-cone" structure (endocones).
Remarks. - Long septal necks make the Endoceratina different from their ancestral Ellesmeroceratina
as well as from all the other primitive naut iloids. The complete separation
of the siphon from the chambers by the imperforate neck made cameral-liquid exchange probably
difficult, causing the absence of cameral deposits.

Synonimy
[endocerasy]

Zasięg czasowy

Literatura