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Rhynchonella decorata mm 29 Brachiopod Fossil Jurassic (3)

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  • Product Code: F25051
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Description

Origin : France (Ardennes)

Geological era : Middle Jurassic (Bajocian)

Age : 170 million of years

Size : 17 gr - mm 29 x 28 x 23


Fossil Brachiopod Jurassic mm 29 x 28 x 23 - gr 17 Rhynchonella decorata. The Brachiopod Fossil you will receive is the one of the Photo.

Rhynchonella is an extinct genus of brachiopods found in the fossiliferous strata from the Silurian to the Eocene throughout the world. It was a stationary epiphaunal suspensory invertebrate.
These articulated brachiopods long from 1.75 to 3.75 cm are characterized by a triangular shell with a spherical profile, marked ribs, a curved hinge line and a small umbo. The anterior border shows a tongue-shaped projection.
About forty extinct species are known.
Syn. Decorated Isjuminella

The phylum of brachiopods consists of marine invertebrates, benthic, sessil, sospensivorous and with bilateral symmetry. The plane of symmetry is perpendicular to the commissure of the valves, which are divided into a peduncular valve (or ventral) and a brachial (or dorsal), generally smaller. They are inequivalves and equilateral.
They look, similar to the phylum of bivalve molluscs, is simply due to convergent evolution, having no direct relationship with them.
Nowadays these animals are scarce because they live in "refuge areas", ie areas with low population and competition. They were however very common in the Paleozoic, then, following the mass extinction at the Permian-Triassic, have migrated into deeper waters.



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