{ Characteristics }
Echinoderms have spiny skin, an internal skeleton, a water vascular system, and suction-cuplike structures called tube feet. Most adults exhibit five-part radial symmetry. All are marine animals.
Reproduction
Echinoderms have two means of reproducing. They can reproduce asexually or sexually.
Echinoderms can reproduce asexually through regeneration. If a part of the echinoderm has broken off, it can regenerate new parts if it has part of the central disk.
Echinoderms have sex organs in each arm. Since echinoderms are not hermaphroditic, both gametes are released into the water where fertilization occurs.
Examples of Echinoderms
There are about 7000 species of echinoderms.
There are five classes of echinoderms: sea urchins and sand dollars, brittle stars, sea cucumbers, sea stars, and sea lilies and feather stars.
Vocabulary
endoskeleton - structural support located inside the body of an animal
water vascular system - system of internal tubes in echinoderms that carries out essential functions such as feeding, respiration, circulation, and movement
madreporite - sievelike structure through which the water vascular system of an echinoderm opens to the outside
tube foot - suction-cuplike structure attached to radial canals of echinoderms’ used to walk and to open shells
Works Cited
http://lhsvirtualzoo.wikispaces.com/file/view/Purple-sea-urchin.jpg/207862348/Purple-sea-urchin.jpg
http://myfishtanks.info/wp-content/uploads/2009/08/brittle.jpg
http://herbsknowledge.com/wp-content/uploads/2011/04/collagen-sea-cucumbers-skin-face-care-herbs.jpg
http://www.starfish.ch/Fotos/echinoderms-Stachelhauter/starfish-Seesterne/Fromia-indica.jpg
http://www.indianetzone.com/photos_gallery/31/sealily1_21747.jpg
http://www.starfish.ch/Fotos/echinoderms-Stachelhauter/featherstars-Federsterne/Zygometra-sp-4.jpg
http://wamuseum.com.au/dampier/images/explore/echinoderm/seaurchin/seaurchin04.jpg
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