cystidn.
/ˈsɪstɪd/ 1. Geology. A member of the order Cystidea or Cystoidea of fossil echinoderms; a cystidean.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > division Pelmatozoa > member of class Cystoidea
cystid1863
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1863 J. D. Dana Man. Geol. 162 The Cystids are the most anomalous of Radiates.
1877 J. Le Conte Elements Geol. (1879) 299 Stemmed Echinoderms or Crinoids, may be divided into three families, viz.: 1. Crinids, 2. Cystids, 3. Blastids.
2. Zoology. ‘The sac-like ciliated embryo of some of the Polyzoa’ ( New Sydenham Soc. Lexicon).
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1877 T. H. Huxley Man. Anat. Invertebrated Animals viii. 459 From one end of this cystid, one or more polypides are developed from thickenings of the wall of the sac.
This entry has not yet been fully updated (first published 1893; most recently modified version published online September 2019).
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