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Description: | Specimen of a fossil blastoid, Pentremites pyriformis, collected from unspecified rocks of Early (?) Carboniferous, Mississippian (?) age from Indiana, U.S.A.. Collected by David M. Lumsden.
Pentramites is one of the best known Blastoids, an extinct group of echinoderms (a group that includes star fish and sea urchins). The bud-shaped calyx (cup) has five-sided symmetry (hence the name 'pent...') and contained the animal's organs. It was attached to the sea floor by a stalk and had a crown of delicate arms that it used to collect food particles. The mouth is in the centre surrounded by five circular holes known as spiracles, one of which contains the anus. Blastoids usually lived in shallow water reefs.
The specimen was found in USA.
It is from the Carboniferous period (362 - 290 million years ago) | Publisher: | Tyne & Wear Archives & Museums | Subjects: | David M. Classification: Animalia Blastoidea Echinodermata Invertebrata Lumsden | Temporal: | Carboniferous period (362 - 290 million years ago) | Source: | Tyne & Wear Archives & Museums | Identifier: | http://www.twmuseums.org.uk/geofinder/se... | Go to resource |
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