Definition of blastoidea

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Blastoidea (n. pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.

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Pentremites :: Pentremites (n.) A genus of crinoids belonging to the Blastoidea. They have five petal-like ambulacra.
Blastoid :: Blastoid (n.) One of the Blastoidea.
Blastoidea :: Blastoidea (n. pl.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.
Crinoidea :: Crinoidea (n. pl.) 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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