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Echinoderm, any of a variety of marine animals belonging to the phylum Echinodermata, characterized by a hard, spiny covering or skin. Beginning with the dawn of the (542 million to 488 million years ago), echinoderms have a rich history and are well represented by many bizarre groups, most of which are now extinct. Living representatives include the classes ( and ), Echinoidea (sea urchins), (sea cucumbers), (, or sea stars), (basket stars and serpent stars, or brittle stars), and the recently discovered Concentricycloidea (sea daisies). Echinoderms have been recognized since ancient times; echinoids, for example, were used extensively by Greeks and Romans for medicinal purposes and as food. During the Middle Ages, fossil echinoids and parts of fossil crinoids were objects of superstition.
Human Skeleton Anatomy Activity Printable Human Skeleton Diagram – Labeled, Unlabeled, And Blank is free HD wallpaper. This wallpaper was upload at December 12, 2017 upload by admin in Bone Anatomy. Human Skeleton Anatomy Activity Printable Human Skeleton Diagram – Labeled, Unlabeled, And Blank in your computer by clicking resolution image in Download by size. 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 such well-known animals as starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or 'stone.
Starfish Dissection Worksheet Answer Key
In the early part of the 19th century, Echinodermata was recognized as a distinct group of animals and was occasionally associated with the cnidarians and selected other phyla in a division of the kingdom known as the Radiata; the concept of a superphylum called Radiata is no longer valid.Echinoderms are separated into 21 classes, based mainly on differences in skeletal structures. The number of exceeds 6,500, and approximately 13,000 fossil species have been described. Like what you’re reading?Echinoderms exhibit a great of body forms, especially among the extinct groups. Although all living echinoderms have a pentamerous (five-part) radial, an internal, and a water-vascular system derived from the coelom (central cavity), their general appearance ranges from that of the stemmed, flowerlike sea lilies, to the wormlike, burrowing sea cucumbers, to the heavily armoured intertidal starfish. The general shape of the echinoderm may be that of a star with arms extended from a central disk or with branched and feathery arms extended from a body often attached to a stalk, or it may be round to cylindrical. Plates of the internal skeleton may with each other (as in sea stars) or be sutured together to form a rigid test (sea urchins).
Echinoderms Anatomy Unlabeled Activity Diagram
Projections from the skeleton, sometimes resembling spikes, which are typical of echinoderms, give the phylum its name (from Greek echinos, “spiny,” and derma, “skin”). The surface of holothurians, however, is merely warty.