sphaeridiumn.
Zoology.
One of the numerous minute rounded bodies attached to certain parts of sea urchins.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > subphylum Eleutherozoa > class Echinoidea > member of (sea-urchin) > parts of > rounded body attached to sea-urchin
sphaeridium1877
1877 T. H. Huxley Man. Anat. Invertebrated Animals 572 In some genera, these sphæridea..are sunk in fossæ of the plate to which they are attached.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 559 Sphaeridia..occur on the peristome and ambulacra... Structurally they are modified spines, spherical or oval in shape.
This entry has not yet been fully updated (first published 1914; most recently modified version published online December 2021).
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n.1877