Photograph of a sectioned shell of the cephalopod,Nautilus sp. Present-day species of Nautilus are descended from species which originated in the early Palaeozoic period and remained widespread into the Lower Mesozoic. During the course of the Middle Mesozoic the number of nautiloid species declined and only a few species survived into the Tertiary and Recent times. The characteristic shape of the shell of present-day species was established in the Lower Mesozoic period | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Nuridsany, Claude / Perennou, Maria |
Taille de l’image : | 4819 px × 3698 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|