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Radial symmetry


radial symmetry. A morphological condition in which the parts of an animal are arranged concentrically around an oral-aboral axis, and more than one imaginary plane through this axis yields halves that are mirror images of each other.
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radial symmetry
[L. radius, a spoke of a wheel + Gk. summetros, symmetry]
Characterizing a body shaped like a pie or barrel, with many equal parts radiating outward like the spokes of a wheel; present in cnidarians and echinoderms.
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radial symmetry. HOWEVER, their larvae have bilateral symmetry so the echinoderms probably evolved from bilaterally symmetrical ancestors and properly belong in the Bilateria.
water vascular system.
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Radiata (unranked) (radial symmetry)
Ctenophora (comb jellies)
Cnidaria (coral, jellyfish, anemones)
Bilateria (unranked) (bilateral symmetry) ...
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The Phylum Cnidaria contains 10,000 species characterized by adult bodies having radial symmetry. Cnidarians are aquatic, mostly all marine. Cnidarians have only the ectoderm and endoderm tissue layers.
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group of simple animals with radial symmetry, including the cnidarians (or coelenterates) and ctenophores.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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