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Brachiopods / filtring animals on foot

brachipode filtreur sur pied

Bulging brachial valve
Brachyprion cf. robustum 
Silurian
Road 65, Ontario
Collection Société d'histoire du Témiscamingue

brachipode filtreur sur pied

Flat pedicle valve
Bachyprion cf. robustus

Siluran
Road 65, Ontario 
Collection Société d'histoire du Témiscamingue
Un homme en excursion safari-fossiles présente un brachiopode
Presentation of a brachiopod during a fossil safari

 

BRACHIOPODS
FILTERING ANIMALS ON FOOT

 

 

First Period of Appearance

 

Brachiopods appeared about 570 million years ago. Very abundant at that time, the phylum had 25,000 species at its peak, and today, only 350 species remains. They ceded their place to bivalves, such as mussels and oysters.

 

Characteristics

 

Brachiopods have two valves and are bivalve look alike at first glance, but they are not. Brachiopods have a dorsal and ventral valve, whereas bivalves valves are lateral. The two sides of the brachiopods are also of different size; the pedicle valve (on the ventral side) is bigger to allow the pedicle to pass.

In general, brachiopods are anchored by their pedicle to the bottom, and they cannot move to hunt. All its life will occur where it has anchored itself during its larva stage, in water that are usually more or less deep. An internal arm covered with hollow tentacles called lophophore, creates a water current to bring it food and oxygen.

The brachiopod is endowed with many organs including a liver, an embryo of a loin, reproductive organs and a blood vessel serving as a primitive heart.

 

In Témiscamingue

 

Our brachiopods are modest in size but varied.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 



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