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In fact, their evolutionary ancestors are believed to have had bilateral symmetry, and sea stars do have some remnant of this body structure. ... Most oxygen enters the starfish via diffusion into the tube feet (with the water vascular system), or the papulae (small sacs covering the upper body surface.
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www.swordfishingcentral.com/starfish.html
www.swordfishingcentral.com/starfish.html
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This sprinting cannibal preys on fellow starfish, as well as any other critter that it can catch. Its predaceous nature makes it an unwelcome diner in crab pots and fishing gear. Starfish have a very simple body structure with five or more legs in a radial array around a central body disk.
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www.adfg.state.ak.us/pubs/notebook/shellfsh/starfish.ph...
www.adfg.state.ak.us/pubs/notebook/shellfsh/starfish.php
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Starfish typically have five or more "arms" which radiate from an indistinct disk (pentaradial symmetry). In fact, their evolutionary ancestors are believed to have had bilateral symmetry, and sea stars do exhibit some superficial remnant of this body structure.
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sheppardsoftware.com/content/animals/animals/invertebra...
sheppardsoftware.com/content/animals/animals/invertebrates/starfish.htm
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There are a few starfish that have 6 or 7 arms, ... Sea cucumbers have a remarkable capacity for regenerating their body parts. When attacked they shed a sticky thread like structure which is actually parts of their guts. The so called Cuverian threads are toxic (the poison is called holothurin) and can dissuade many...
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www.starfish.ch/reef/echinoderms.html
www.starfish.ch/reef/echinoderms.html
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The starfish body wall, which contains roughly equal proportions of connective tissue and calcite ossicles, is poorly understood in terms of its structure ...
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jeb.biologists.org/cgi/reprint/147/1/53.pdf
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The structure of the dorsal body wall of the starfish Echinaster spinulosus was studied using polarized light microscopy of frozen tissues, scanning electron microscopy and histology. The collagen fibres of the body wall form a three-dimensional orthogonal web.
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jeb.biologists.org/cgi/content/abstract/147/1/53
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2 Body Structure ... Pentamery* is best displayed in the asteroids (starfish), and ophiuroids (brittle stars), but is less obvious in the echinoids (sea urchins) and holothurians (sea cucumbers).
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www.cce.paisley.ac.uk/courses/tatner/biomedia/units/ech...
www.cce.paisley.ac.uk/courses/tatner/biomedia/units/echi2.htm
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Starfish or sea stars are animals belonging to phylum Echinodermata, ... They exhibit a superficially radial symmetry, typically with five or more "arms" protruding from a central body. In fact, their evolutionary ancestors are believed to have had bilateral symmetry, and sea stars do have some remnant of this body structure.
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emeagwali.com/Animals/Starfish.shtml
emeagwali.com/Animals/Starfish.shtml
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a star duh! dats y its named starfish a star duh! dats y its named starfish a star duh! dats y its named starfish
http://wiki.answers.com/Q/What_structure_is_a_starfish
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