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Viewers of this program will observe that echinoderm radial symmetry is secondary; ... Echinoderms have an internal skeleton made of bony plates (ossicles) of calcium carbonate. They deposit this material after extracting dissolved calcium and carbonate (bicarbonate) ions from sea water. In some species, such as the sea...
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ebiomedia.com/prod/BOechinoderms.html
ebiomedia.com/prod/BOechinoderms.html
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During the process of maturing, the echinoderm will change its body shape and settle down on the sea floor. ... Characteristic of all echinoderms is the presence of an internal skeleton covered with spines and skin. The skeleton varies with the type of echinoderms. In sea stars and brittle stars, the skeleton consists...
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www.oceaninn.com/guides/echino.htm
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ECHINODERMATA taxonomy, physiology, and body pattern. ... The Echinoderms have three features that distinguish them from other phyla; radial symmetry, the calcareous mesodermal skeleton and the water vascular system. The fossil record goes back to the Cambrian.
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www.bumblebee.org/invertebrates/ECHINODERMATA.htm
www.bumblebee.org/invertebrates/ECHINODERMATA.htm
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Echinoderm means "spiny skin.". Because of its abundant fossil record, up to 25 classes have been recognized. A traditional hypothesis of the Echinodermata using only extant taxonomic groups places the Asteroidea and Ophiuroidea as sister groups based on ... An internal skeleton is present throughout members of the phylum.
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Echinodermata.html
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How the echinoderm larval skeleton is used for support of larval arms, passive orientation, and swimming was examined by experimentally removing the skeletons of plutei and by comparing feeding larvae from four echinoderm classes.
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www.biolbull.org/cgi/content/abstract/179/1/121
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within the echinoderm skeleton (e.g. Okazaki and Inou6. 1976; O'Neill 1981 ; Dubois and Jangoux 1985). For the moment, it is still debated whether the ...
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www.springerlink.com/index/TG86208Q06736054.pdf
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When they settle to the bottom they change to the typical echinoderm features. ... Radial symmetrical body with a external chitinous skeleton and a centrally located jaw (called Aristotle's lantern) with horny teeth. The mouth consists of a complex arrangement of muscles and plates surrounding the circular opening.
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www.starfish.ch/reef/echinoderms.html
www.starfish.ch/reef/echinoderms.html
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Web Images 74 (dvs074) > Topside of white sandollar (Echinoderm) on light green background,close-up,Digital composite (dvs074022) ... ; Studio Shot; Green; Animal Skeleton; Exoskeleton; Echinoderm; Sand Dollar photo...
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www.inmagine.com/dvs074/dvs074022-photo
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Use echinoderm in a Sentence ... Any of various marine invertebrates of the phylum Echinodermata, having a latticelike internal skeleton composed of calcite and usually a hard, spiny outer covering. The body plans of adult echinoderms show radial symmetry, typically in the pattern of a five-pointed star, while the larvae...
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dictionary.reference.com/browse/echinoderm
dictionary.reference.com/browse/echinoderm
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