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Echinoidea

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Ech`i`noi´de`a
n. pl.1.(Zool.) The class Echinodermata which includes the sea urchins. They have a calcareous shell, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.Echinoidea - sea urchins and sand dollarsEchinoidea - sea urchins and sand dollars        
class Echinoidea
Echinodermata, phylum Echinodermata - radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers
sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
Exocycloida, order Exocycloida - flat sea urchins
order Spatangoida, Spatangoida - heart-shaped sea urchins
class - (biology) a taxonomic group containing one or more orders
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The other sea otter foe is urchin harvesters, who covet the same members of the Echinoidea class that otters are known for gobbling in vast quantities.
SEA OTTER SIGHTING RAISES STIR, QUESTIONS by The Register-Guard (Eugene, OR)
The Echinodermata are represented by a number of groups: Crinoidea, represented by articulated calyxes and disarticulated columnals and brachials; Blastoidea, represented by columnals and calyxes, especially those of Pentremites conoideus; Echinoidea, represented by disarticulated interambulacral plates as well as several largely intact specimens; and Asteroidea, represented by one nearly complete specimen, as well as disarticulated dorsal plates from the same species.
A case study in paleoecology from the Mississippian of Missouri, with ... by Brandenburg, J.P. / Transactions of the Missouri Academy of Science
 
 
 
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