What are echinodermy?

echinoderms are a very old phylum of sea animals whose name in Greek means "barbed skin". However, this name is an incorrect name, because not all echinoderms have a spine. Their more suitable universal feature is a common predecessor, including a unique water -based vascular system and a frequent five -fold symmetry. Although they do not always exhibit five times symmetry (sea cucumbers are echinoderms and have bilateral symmetry), echinoderms are known for often playing games with a typical bilateral trend of symmetry, as in marine uchins (radial symmetry) and five multiple dollars). Echinodermy is one of several phylls that is exclusively sea. This fossil comes with late Ediacaran, about 550 million years ago. In addition, the first Certain Echinoderms appears on an early Cambrian, about 530 million years ago. Echinodermy contains 7,000 living species, the second largest phyl deuterostomes after chords (vertebrates) that are dominant with a large body on the ground.

Very flexible, echinoderms are found at every depth of the ocean, from the intertidal zone to the abysmal zone, a mile to a mile below the surface. There are two primary echinoderms; Calmly Eleutherozoa, which includes starfish, fragile stars, sea hedgehogs, sand dollars, sea daisies and sea cucumbers; and sessile pelmatozoa that includes crinoids (feathers). The mobile sub -phyla crawls along the ocean DNA using a muscle foot and is specialized in the consumption of the bottom that few other ocean animals can.

echinoderms are significant because it is one of the only large animals capable of surviving in a thetal desert that characterizes the vast majority of the world's oceans. Their skeletons easily fossil and provide paleontologists with important biogeographic information. Many limestone formations are made of echinoderm skeletons and some paleontologists believe that evolutionary radiation of echinoderms wouldLO responsible for a sudden increase in the diversity of marine mesozoic life.