The enlarged rear interambulacrum on the oral side of holasteroids and spatangoids is known as the plastron.
Source: wiktionary
Spatangoid
Synonyms for "spatangoid" (2 found)
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Noun(1 words)
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Spatangoids constitute a monophyletic group of heart urchins that appears in the early Cretaceous (145 M.Y. ago) and ranges to the Recent.
Source: wiktionary
Oval tests with specific ventral morphology for efficient burrowing allowed spatangoids to burrow deeply in sand to avoid gastropod predation.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.