What is in biology, what is the bilateralia sub -register?

bilateria is a subregenum or subordinate animal kingdom in general. It consists of all animals with the exception of fungi, Cnidarians (jellyfish and relatives) and CTenophore (combat jelly). Bilaterian share many common characteristics, including three layers of primary tissue (also called the germ layers), bilateral symmetry, coeloma (body cavity) and usually sophisticated organs and morphology of the body. All complex animals are part of the bilatery, because two layers of bacteria (obsessed with non -bacon) are not enough to cut sophisticated morphologies. It was between 0.1 and 0.2 mm (100 and 200 microns) in diameter that this small spherical animal was named Vernanimacula , which means a "small spring animal". The animal was given this name because it developed shortly after the marinonan posting, which is the most serious ice age in the history of the planet, which lasted about 50 million years. Something is closely related to Vernanimacula is probably a common ancestor of every member of Bilateria.

One of the key evolutionary innovations of bilatents is coeloma or body cavity, which allows organs to develop independently of the wall of the body and protect them from damage to fluid. Coelom also allows the hydrostatic skeleton to stretch the muscles, allowing more sophisticated locomotions and movement than animals without coeloma. Without coeloma, animals are very fragile to external pressure, which can easily damage organs. With the exception of several animals that have lost their coeloma or have reduced coeloma, they use this evolutionary innovation, including humans and all mammals.

Bilaterian fossils appear in Ediakar fossil beds, which represent the first ecosystems of multicellular life. This includes a Parvancorina-shaped shield atrilobite-like Spriggina , which could be one of the first known predators. It is controversial whether Spriggina was a real member of Bilateria because he showed Glide symmetry - Kde of its symmetry is on one side on one side of one segment of the body - rather than real symmetry.

Bilaterian organisms first came to control the environment in Cambrian, during which representatives of the most modern phyla evolved. At that time, the Bilaterians were represented by Velvet worms, arthropods such as trilobites, Annelid Worms and even early fish without the jaw. As the evolution continued, the bilteries continued to differentiate and dominated the ecosystems, as it had been since the dawn of Cambian 542 million years ago. Today bilaterance consists of millions of species while non -backed only about 14,000.