Echinoidea

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Echinoidea

[‚ek·ə′noid·e·ə]
(invertebrate zoology)
The sea urchins, a class of Echinozoa having a compact body enclosed in a hard shell, or test, formed by regularly arranged plates which bear movable spines.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Following previous descriptions and knowing that echinoids (sea urchins) are gonochoric, we argue that existence of ovotestis in Loxechinus albus corresponds to an isolated phenomenon that perhaps depicts a sequential hermaphroditism detected on this occasion first as male, then female.
Parallel evolution of nonfeeding larvae in echinoids. Syst.
Reproductive periodicity of the echinoids Diadema and Echinometra on the two coasts of Panama.
Local or random movement has been observed in previous movement studies of echinoids (Dumont et al.
Diademasetosum (Leske, 1778) (Echinometra: Echinoidea: Diadematidae) also known as long-spined black sea urchin, is one of the most common echinoids that widely distributed in the Indo-West Pacific Ocean especially in coral ecosystems,and have profound biological, ecological and aquacultural significance (Lessios et al., 2001; Rahman et al., 2012a).
Sample analysis: Carbon and nitrogen were measured from the muscle of the Aristotle's lantern (echinoids), and from bulk tissues (algae).
Kanazawa, "Adaptation of test shape for burrowing and locomotion in spatangoid echinoids," Palaeontology, vol.
Seshadri, "Porous gold structures through templating by echinoid skeletal plates," Chemical Communications, no.
The differential effects of seasonal stress and predation on the stability of reef-flat echinoid populations.
(2) Department of Geology, University of lbadan, lbadan E-mail: waleakinmosin2001@yahoo.com Table 1: Summary table of components of ibese limestone Plate Depth Fossil Intraclast Ooid (M) 1 23.0 Sponge Spicules v X 2 24.5 Sponge Spicules v v 3 34.0 Echinoid X X Sponge Spicules Bivalves 4 37.5 Pelecypod X X 5 38.5 Pelecypod v v 6 40.0 Sponge Spicules X X 7 47.5 v X 8 48.5 Globorotalia v X Cerroazulensis Plate Depth Pellet Support Sparry (M) Calcite 1 23.0 v MUD/GRAIN v 2 24.5 v MUD v 3 34.0 X MUD X 4 37.5 X GRAIN v 5 38.5 v MUD/GRAIN v 6 40.0 v MUD X 7 47.5 v GRAIN v 8 48.5 v MUD v
The sand dollar echinoid Periarchus lyelli (Conrad) is a distinctive and well-known element of the fauna of Upper Eocene (Jackson) marls and limestones across the eastern Gulf of Mexico and lower Atlantic coastal plain.