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Radiata

radiata

(Science: zoology) An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.

It includes the coelenterates and the echinoderms. Formerly, the group was supposed to be a natural one, and was considered one of the grand divisions of the animal kingdom.

Origin: NL, fr. Radiatus, p. P. See Radiate.


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Jussthink!

... they developed radial symmetry as an adaptation for a sessile existance. Formerly, all radial symmetric animals were grouped in the taxon "radiata," which also included cnidarians (jelly fish...) and ctenophora until the bilateral echinoderm larval stage was discovered. In this case, ...

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by plasmidmap
Wed Apr 19, 2006 4:59 am
 
Forum: General Discussion
Topic: Jussthink!
Replies: 14
Views: 2075

Re: does anyone have Biology by campbell 7th edition

... Ancestral colonial flagellate->metazoa->(Porifera,eumetazoa)...Eumetazoa (Cnidaria,Ctenophora-those 2 cause of radial symmetry are called 1.Radiata...and 2.Bilateria-Protostomia(Platyhelminthes,Mollusca,Annelida and Arthropoda,Rotifera,Nemertea<Nematoda) and Deuterostomia (Phoronida,Ectoprocta,Brachiopoda,Echinodermata,Chordata) ...

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by zami'87.
Wed Oct 19, 2005 6:56 pm
 
Forum: General Discussion
Topic: does anyone have Biology by campbell 7th edition
Replies: 9
Views: 3030


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