warned - Fossilised animal - cleoniceras + cleoniceras con ematite - 160 mm - 125 mm

A very important fossil group from the Devonian-Cretaceous period. Completely extinct by the end of the Cretaceous, it is believed to have descended from ancestors belonging to Nautiloidea. Although part of the mollusk cephalopod group, CLEONICERAS is distinguished mainly by the shape of its shell, characterized by bilateral symmetry. The shell is divided into an anterior, undivided region where the animal resided, and a posterior region divided into chambers. The line of closure between the chambers is highly indicative and facilitates species recognition. Additionally, its outline, initially quite simple and linear in early forms, gradually changed until the more recent ammonites, which are often very jagged and almost baroque. Sizes vary: from a few centimeters to as much as 10 centimeters. Since these are entirely extinct marine species, we can only hypothesize about their lifestyle. It is believed that forms with smooth shells on the outside were swimmers, often predators. Species with more costate and ornamented shells were predominantly benthic.
Unmissable lot consisting of two splendid examples of worked Cleoniceras, one of which has the dark color typical of hematite.
Looking at the outside of these beautiful fossils, the characteristic suture lines of the species are clearly visible, intertwining in a pattern reminiscent of the sinuous movements of flames.
Two true masterpieces.
Cleoniceras: 125mm x 160mm x 40mm
Cleoniceras with hematite: 123mm x 155mm x 35mm.
Pedestals not included.