What are brachiopods?

Brachiopods, also known as Osše or "Brachs", are a group of molluscs, members of Phylum Brachiopoda. Although some of them look superficial like clams, they are really completely different - on the outside and inside. Brachiopods are phylogenetically unique enough to deserve their own phylum, while clams are fog, part of the phylum of molluscs. Brachiopods are called articular or inarticulation on the basis of whether their two shells have a curtain (articulate) or are held together on the basis of muscles (inarticulation).

Brachiopods are stationary filter feeders that feed on a frilted Lophophore inlet. Unlike fogs that have two symmetrical shells on both sides, brachiopods have symmetrical about central axes, but not with regard to themselves. Some of this has to do with another pendant of brachiopods - pedicles. Pedicle is a fleshy stem that Brachiopod uses to join Surfing, usually permanently. One shell has a specialA pedicle hole to stand out and is therefore called a pedicular valve. The pedicular valve is the upper animal shell and is often stronger and harder than the lower valve (brachial valve), protecting from the attacks from above.

Although rare today, brachiopods are very important in the context of evolution for several reasons. Brachiopods were the first bilateral animals to close in a hard shell and accepted a stationary lifestyle. Brachiopods dominated the ocean bottom for the entire paleozoic era (from 542 to 251 million years), which far exceeded the fog that today covers the ocean DNA. Due to their abundance and hard shells, brachiopods are also the most common fossil. They have been particularly successful since the Ordovica period, when many filter feeders have evolved and began to use food abun part is being built in the earthly oceans.

during the extinction of Permian-Triassic 251 million years ago, Brachiopods all, but they died out. 96% of Brachiopod species died. Since then, the brachiopods have been overcome by bivalve molluscs that use siphons instead of Lophophore to feed and are often mobile, crawling along the seabed or wagging into the substrate using a muscular foot.