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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.
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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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