Brachiopod Fossil Seashell Brachiopoda Invertebrata Mesozoic Jurassic Collection

Description

Origin : Madagascar (Belo sur Tsiribinha)

Geological era : Lower Jurassic

Age : 200 million of years

Size : 10.7 gr - mm 26 x 20 x 17

Brachiopod Marine Fossil Sea Shell mm 26 x 20 x 17 gr 10.7 Brachiopoda sp. Benthic Sessile Invertebrata Extinct Prehistoric Brachiopods Mesozoic Jurassic Collecting Paleontology Museum.

Pleasant fossil find of Brachiopoda from the Lower Jurassic of Madagascar, representative collecible specimen of good quality and in an appreciable state of conservation, with clear details of the shell's shape of the unequal dorsal and ventral valves.
Only a piece, as in photos.

The fossis are supplied naturally, as taken from the field.
All Shells samples come from Belo sur Tsiribihina, Madagascar, from fossiliferous deposits in the baobab trees of limestone formed under the sea 200 million years ago and subsequently eroded by rain water for 5 million years.

The phylum of Brachiopoda 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 valve (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.