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11. Mineral set rough and polished
The Belemnitida are an extinct group within the subclass Coleoidea of the Cephalopoda . A Belemnite, is in fact the central part of the internal skeleton of a squid –like animal. Belemnites have emerged but also disappeared during the Mesozoic. They were most common during the Jurassic and Cretaceous period.
Schematic reconstruction of the main components of a belemnite.
Example of the rostrum of a Belemnite.
Most of the time only the most spherical part of the belemnite is found , the so-called rostrum. In this rostrum there is a cone-shaped cavity , the alveolus . Inside it the animal itself lived in a sort of shell , similar to the shells of other cephalopods such as Nautiloids and Ammonites . In well-preserved specimens this phragmocone can be found. Some species are known to have been active hunters possessing large tentacles with sharp hooks . These can also be found sporadically as fossils.
A Belemnite with a part of the phragmocone in its original position.
Photos and locations for Belemnoidea on this site
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