https://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/echinoida
Echinoida | Encyclopedia.com
Echinoida (class Echinoidea, superorder Echinacea) An order of regular echinoids that have imperforate, non-crenulate tubercles, solid spines, and shallow gill...
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https://lod.nal.usda.gov/nalt/es/page/190681
NAL Agricultural Thesaurus: NALT: Echinoida
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