Type of Coelom: Animals in phylum echinodermata are Coelomates. Echinoderm is the common name given to any member of the phylum Echinodermata (from Ancient Greek, ἐχῖνος, echinos – "hedgehog" and δέρμα, derma – "skin") of marine animals.The adults are recognizable by their (usually five-point) radial symmetry, and include starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies". Radial symmetry is symmetry around a central axis. Body is star shaped; Some of the forms were extinct and living forms. Echinoderms are extremely unique because of their trait to regenerate body tissue, organs, and limbs. Body has more than two cell layers, tissues and organs. GENERAL CHARACTERISTICS • echino = “bumpy” or“spiny • derm = “skin • Echinoderms are radically symmetrical equal units arranged in a circle around a central disk • Many have five equal units so we can specify that they have pentamerous radical symmetry as adults • Calcareous endoskeleton, often bearing visible spines. The Phylum Echinodermata Etymology: From the Greek Echinos for half, and Derma for skin. Phylum echinodermata 1. Most possesses a through gut with an anus. Type of Body Plan: Their body has no segmentation but this doesn't mean it doesn't have repetition. Arms bifurcated, with two pinnules. Type of Symmetry: Matured echinodermata have radial symmetry, but as larvae their symmetry is bilateral (this is an adaptive advantage). They are unique in the animal kingdom in having this symmetry. Phylum Echinodermata 2. Characteristics of Echinodermata: Possess 5-rayed symmetry, mostly radial, sometimes bilateral. Echinodermata are exclusively marine organisms. Echinodermata are so named owing to their spiny skin (from the Greek “echinos” meaning “spiny” and “dermos” meaning “skin”), and this phylum is a collection of about 7,000 described living species. Beginning with the dawn of the Cambrian Period (542 million to 488 million years ago), echinoderms have a rich fossil history and are well represented by many bizarre groups, most of which are now extinct. There are over seven thousand living species of Echinodermata living on the ocean floor. Echinoderm, any of a variety of invertebrate marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin.
Body shape highly variable, but with no head. Body cavity a true coelom. Echinodermata is a phylum consisting of radial symmetrical marine animals. Nervous system includes a […] They have tube feet without suckers; Examples: Neometra, Antedon, Rhizocrinus, etc Phylum Echinodermata: General Characteristics and Classification The weird and wonderful animals of the Phylum Echinodermata have a calcium carbonate skeleton and a kind of symmetry that is fivefold.
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