Crinoidea

Definitions

  • WordNet 3.6
    • n Crinoidea sea lilies
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Webster's Revised Unabridged Dictionary
    • n. pl Crinoidea (Zoöl) A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, like some that are recent, were attached by a jointed stem. See Blastoidea Cystoidea Comatula.
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Century Dictionary and Cyclopedia
    • crinoidea A class of Echinodermata containing globular or cup-shaped echinoderms, having, normally, jointed arms furnished with pinnules, and stalked and fixed during some or all of their lives: so called from the resemblance of their rayed bodies, borne upon a jointed stem, to a lily or tulip. The body or calyx of the ventral surface is directed upward; the stalk is attached to the aboral, dorsal, or inferior surface, which is provided with plates; and the ambulacral appendages have the form of tentacles situated in the ambulacral grooves of the calyx and of the segmented arms. The class is divided into three orders: the Blastoidea, which are without arms; the Cystoidea, which are globular, and have arms; and the Crinoidea, which are cup-shaped, and provided with arms. All the representatives of the first two orders, and most of the third order, are extinct. The fossil forms are known as stone-lilies and encrinites. See stone-lily and encrinite.
    • crinoidea The typical order of the class Crinoidea, having the body cup-shaped or calyx-like. the dorsal or aboral surface furnished with hard calcareous plates, the ventral or oral aspect coriaceous, and the body stalked and rooted, at least for some period if not continuously, and provided with five or more radiated segmented arms bearing pinnules and disconnected from the visceral cavity. All the ordinary encrinites, stone-lilies, lily-stars, etc., belong to this division, which abounded in early, especially Paleozoic, times, and is still represented by six living genera. These are Antedon (or Comatula), Actinometra, Comaster, Pentacrinus, Rhizocrinus, and Holopus. The order Crinoidea is by some divided into two suborders, Articulata and Tesselata, the latter all fossil; by others into the families Encrinidœ and Comatulidœ, the former containing the ordinary encrinites or stone-lilies, as well as some living sea-lilies, and the latter comprising the feather-stars. Also called Brachiata.
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Chambers's Twentieth Century Dictionary
    • n.pl Crinoidea krī-noid′ē-a a class of Echinodermata, sometimes called feather-stars or sea-lilies, and well known in fossil forms as encrinites or stone-lilies
    • adjs Crinoidea and ns. Crinoid′, Crinoid′ean
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Etymology

Webster's Revised Unabridged Dictionary
NL., from Gr. kri`non lily + -oid,: cf. F. crinoïde,

Usage

In literature:

Favosites, Stromatopora concentrica, Heliopora pyriformis, and stems of crinoidea are found loosely about the surface.
"Three Expeditions into the Interior of Eastern Australia, Vol 2 (of 2)" by Thomas Mitchell
A genus of Crinoidea.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
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