What are the tunics?

tunicates are a common sub -filters of filters similar to the sea bag feeder filters that commonly occur in all oceans of the world. Although they are usually attached to the sea bottom, the most famous tunicates are free floating, including pyrozomes (bioluminescence tunicates), Salp (living in long linear colonies) and doliolides (tunicates with large siphons). Together with countless other organisms, tunicates are plankton. They are also called "sea syringes" or "marine pork" and come in various colors, especially among the bentic (bottom of live) species. This is evidenced by their larvae, bilateral course animals with a simple nervous cord. On this basis, tunicates are classified as chords, a phylum that contains all vertebrates, in sub -phylumurochordata.

Many paleontologists are considering the windows of the windows for what the earliest chords looked like. Chordaty would branches from our closest relatives, worms of acorn, sometimes in late Edicarana or early CambrianThe Ijian period (about 542 million years ago). Modern Tunicates, however, barely resemble a stomach worm, suggesting that it was only on crimes.

tunicates are thus named for their tunic, a hard fleshy shield that surrounds the body in the shape of the head. Before becoming adult tunics, larvae tunicates floats in a water column, building a proteins equipped with a "house" filter (tests) for themselves, helping to concentrate food particles from drawing them into the pharynx slots. As the larva grows and the test filters are clogged, they are discarded. The larva is the only tunings that are able to eliminate their tunics in this way. Although these tests are very small, the number of larvae of tunicates in the oceans is so great that the discarded tests form a substantial part of all carbon descendingthe ocean.