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A phylum of Metazoa that includes starfish, sea urchins, sea lilies, and other classes. All but the sea cucumbers (Holothuroidea) are basically radially symmetrical and most possess a calcareous endoskeleton with external spines. They inhabit the sea bottom, some near shore, others in deep water.
[echino- + G. derma, skin]
References in periodicals archive ?
2009 Elevated water temperature and carbon dioxide concentration increase the growth of a keystone echinoderm.
The fixed variables were site and period; and the dependent variables were Simpson Index, and each of the major macrobenthic invertebrate groups (Annelids, Echinoderms, Mollusks, Crustaceans, and others).
Researchers anticipate collecting a diverse range of marine organisms, including invertebrates such as sponges, corals (non-reef builders), tunicates and echinoderms, as well as algae--all of which will provide a wealth of information that could potentially lead to discoveries of new chemical entities and novel, natural, therapeutic commercial products.
Since echinoderms share deuterstome ancestry with the Phylum Chordata, it is of particular interest to examine the recently decoded genome of the sea urchin (Sea Urchin Genome Sequencing Consortium 2006).
ENTEROCOELE the body cavity formed from an outpocketing of the archenteron (a primitive digestive cavity), especially typical of echinoderms and chordates [RHD].
Beckstrom, have written a just-released book titled The Starfish and the Spider: The Unstoppable Power of Leaderless Organizations (Portfolio), in which they hold forth on not only the model of the Apache tribes ("The Apaches persevered because they were decentralized") to, yes, echinoderms and arachnids.
Complete echinoderms are very rare because their skeletons were readily broken up after death.
Echinoderms, animals like sea urchins and starfish, carry a distinct gene known to scientists as the alkaline phosphatase gene that is believed to be responsible for developing a pre-skeletal system within the echinoderm, of which is later on replaced by calcium deposits to make the final skeleton.
A diverse faunal assemblage was recovered including crustacea, echinoderms, elasmobranchs, turtle, nearly a hundred different shellfish taxa, and at least 20 fish taxa.