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Most living echinoderms, like this sand dollar from Baja California, are pentameral; that is, they have fivefold symmetry, with rays or arms in fives or multiples of five. However, a number of fossil echinoderms were not pentameral at all, and some had downright bizarre shapes.
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www.ucmp.berkeley.edu/echinodermata/echinodermata.html
www.ucmp.berkeley.edu/echinodermata/echinodermata.html
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Echinoderms have been compared to living, moving castles. Castles are made of interlocking blocks, with a single main entrance and numerous slit windows for air and for defense. Echinoderm skeletons are made up of interlocking calcium carbonate plates and spines.
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www.ucmp.berkeley.edu/echinodermata/echinomm.html
www.ucmp.berkeley.edu/echinodermata/echinomm.html
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The following classes are types of echinoderms: ... Echinoderms have a few important aspects in common. They have bony ossicles in their body. They have a water-vascular system which pumps water through the madroporite. They also have small jaws that are supported by the water-vascular system.
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www.cyhaus.com/marine/Echinoderm.htm
www.cyhaus.com/marine/Echinoderm.htm
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While the majority of animal body plans are bilateral with a distinct head and tail, echinoderms do not follow this pattern. While many echinoderms begin life as a bilateral larva, later in life they take a radical change of course.
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www.pbs.org/kcet/shapeoflife/animals/echinoderms.html
www.pbs.org/kcet/shapeoflife/animals/echinoderms.html
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Echinoderm - Wikipedia, the free encyclopedia
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Echinoderm , there are seven main classes of Echinoderms which are brittle stars, basket stars, sea urchins, sand dollars, sea lilies, feather stars, and sea cucumbers. They can be found at every oce...
en.wikipedia.org/wiki/Echinoderm
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Mainly a marine group, echinoderms are found in all the oceans. (Brusca and Brusca, 2003) ... Except for a few species which inhabit brackish waters, all echinoderms are benthic organisms found in marine environments. Echinoderms inhabit depths ranging from shallow waters at tide lines to the deep sea. (Barnes, 1987;
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animaldiversity.ummz.umich.edu/site/accounts/informatio...
animaldiversity.ummz.umich.edu/site/accounts/information/Echinodermata.html
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Sea and Sky's Echinoderms page 1 contains information about the cushion star, sunflower starfish, pacific starfish, orange starfish, and short-spined starfish. ... The echinoderms are a group of animals that includes starfish, urchins, feather stars, and sea cucumbers. They are simple animals, lacking a brain and...
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www.seasky.org/reeflife/sea2d.html
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Echinoderms are armored animals that have a hard endoskeleton made of interlocking calcium carbonate plates and spines. These slow-moving creatures have a water-vascular system (a rudimentary circulatory system), water-filled channels that go through the body.
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www.enchantedlearning.com/subjects/invertebrates/echino...
www.enchantedlearning.com/subjects/invertebrates/echinoderm/
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Echinoderms form a well-defined and highly-derived clade of metazoans. They have attracted much attention due to their extensive fossil record, ecological importance in the marine realm, intriguing adult morphology, unusual biomechanical properties, and experimentally manipulable embryos.
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tolweb.org/tree?group=Echinodermata&contgroup=Deuterost...
tolweb.org/tree?group=Echinodermata&contgroup=Deuterostomia
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