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A member of the phylum Echinodermata.


any member of the phylum Echinodermata, including the sea urchins, starfish, brittle-stars, sea cucumbers, feather stars and sea lillies. The phylum is characterized by a pentaradiate structure (a five-sided RADIAL SYMMETRY) and the presence of tube feet in most forms.
References in periodicals archive ?
Although rapid burial can happen by several processes, apparently storm deposition is the most common bottom-smothering process that commonly leads to complete preservation of crinoids and other echinoderms (Meyer and others 1989; Ausich 2001).
1992; Hunt 1993) and reduced geographic range (Emlet 1995) in Patiriella and other echinoderms.
2012), we attempted to reconcile the astral microtubule and central spindle models in echinoderm embryos by examining the requirement for, and distribution of, the centralspindlin (tracked via anti-MKLP1 localization) and CPC (tracked via anti-Survivin localization) complexes during early division cycles.
These cells stay in the body cavity, on the coelomic fluid present in the circulatory system of adults and larvae echinoderms.
Volume and composition of echinoderm eggs: implications for the use of egg size in life-history models.
The reefs are embedded in an echinoderm grainstone, identical to those known from the Vasalemma and Rummu area.
Ciliary bands in echinoderm larvae: Evidence for structural homologies and a common plan.
Among marine invertebrates, examples of polyembryony are most widespread within echinoderms.
According to Craig Smith, a biological oceanographer at the University of Hawaii at Manoa, the numbers that this study reveals are probably an underestimate because vast regions of the Equatorial Pacific have high echinoderm biomass but are not well studied.
Much of the organic content of echinoderm eggs is yolk protein (Turner and Lawrence 1979).

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