Belemnites acuarius Schlotheim

Scale bar = 5cm

Description

Lower Jurassic, Middle Lias (incl. Dyrham Silts)
Dorset (unlocalised)
Dorset
England
M1037
Description:

Belemniodea (commonly refered to as belemnites after the ancient Greek belmnon meaning dart or arrow) are an extinct group of squid like cephalopods most closely related to modern cuttlefish. The animals had an internal chambered shell, known as a phragmocone, that they used for boyancy, attached to the back of the phragmocone was the rostrum a bullet shaped piece of calcite that probably acted as a counterbalance for the swimming animal. The shell was internal to the fleshy body of the animal and the rostrum, as seen here, is the only part commonly fossilised.
Moore, C.

Classification

Mollusca
Visceroconcha
Cephalopoda
Coleoidea
Belemnitida
Belemnitida family
Belemnites
acuarius