sea urchin

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Related to Arbacia: Crangon

sea urchin

n.
Any of various echinoderms of the class Echinoidea, having a soft body enclosed in a rounded, radially symmetrical, calcareous skeleton covered with long spines.

sea urchin

n
(Animals) any echinoderm of the class Echinoidea, such as Echinus esculentus (edible sea urchin), typically having a globular body enclosed in a rigid spiny test and occurring in shallow marine waters

sea′ ur`chin


n.
any echinoderm of the class Echinoidea, having a somewhat globular or discoid form and a shell composed of many calcareous plates covered with projecting spines.
[1585–95]

sea urchin

Any of various invertebrate sea animals having a round body covered by a shell with movable spines. Sea urchins are related to starfish.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shellssea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
echinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodies
class Echinoidea, Echinoidea - sea urchins and sand dollars
Echinus esculentus, edible sea urchin - a sea urchin that can be eaten
sand dollar - flattened disklike sea urchins that live on sandy bottoms
heart urchin - sea urchin having a heart-shaped body in a rigid spiny shell
Translations
merisiili
hérisson de mer
קיפוד ים
tengeri sün
ígulker
zee-egel

sea urchin

nriccio di mare

sea urchin

n erizo de mar
References in periodicals archive ?
Temperature modulates the response of the thermophilous sea urchin Arbacia lixula early life stages to C[0.
Normal Embryogenesis in Arbacia, Katie Hopkins, Susan Roy, Department of Biology, Presbyterian College
Hemisquilla ensigera californiensis, Dromidia larraurei, Pteria sterna, Arbacia incisa, and Centrostephanus coronatus) represented new records at one or more islands.
American lobsters, rock crabs, Jonah crabs, spider crabs, sea stars, and urchins, Arbacia punctulata, are found on these reefs (Westman, 1958; Cobb, 1971; Briggs and Zawacki, 1974; Briggs, 1975; Alfieri, 1975; Sheehy, 1976; Feigenbaum et al.
Studies of fertilization VII: analysis of variations in the fertilizing power of sperm suspensions of Arbacia.
The purpose of this experiment was to observe normal embryonic development of the sea urchin, Arbacia.
This was at a time when populations of the common purple sea urchin, Arbacia punctulata, popular especially for embryological research at MBL, were heavily harvested and dangerously depleted.
ABSTRACT The sea urchins Paracentrotus lividus and Arbacia lixula were collected monthly for 1 y in the southern coast of Spain and their gonad fatty acids were analyzed to evaluate seasonal variations.