The problem of ontogenesis and phylogenesis of Lower Cretaceous Belemnites

Author: shalva keleptrishvili
Keywords: belemnites, rostrum, ontogenesis, phylogenesis
Annotation:

In Belemnite ontogenesis there are two stages: embryonic and post-embryonic. At the embryonic stage,there were formation of protoconch, primordial rostrum, adherent membrane, fixator, first septum of the fragmocon and initial part of proostracum.

Lecture files:

The problem of ontogenesis and phylogenesis of the Lower Cretaceous belemnites [en]
ქვედაცარცული ბელემნიტების ონტოგენეზისისა და ფილოგენეზისის პრობლემა [ka]