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Related to Blastoidea: Echinoidea, Crinoidea, Edrioasteroidea


n. pl.1.(Zool.) One of the divisions of Crinoidea found fossil in paleozoic rocks; pentremites. They are so named on account of their budlike form.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Blastoeidea is incorrect in the text (p.23), but correct (Blastoidea) in the note.
BLASTOIDEA Elaecrinus verneulianus (Troost) Heteroschisma pyramidatus (Shumard) CRINOIDEA Dolatocrinus lacus Lyon Dolatocrinus liratus (Hall) Dolatocrinus major Wachsmuth and Springer Megistocrinus depressus (Hall) Megistocrinus rugosus Lyon and Casseday Megistocrinus spinosulus Lyon TABLE 2 Species diagnoses table for Goniocrinus.
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.