An animal belonging to the echinoid class or subphylum Echinodermata; a sea urchin, sand dollar, or related spiny marine animal.
From Greek 'echinos' (ἐχῖνος) meaning 'hedgehog,' with the suffix '-idan' forming a taxonomic designation. A variant or related form of echinoid.
The entire echinoderm phylum evolved their distinctive radial body symmetry (five-fold for most sea urchins) in the ocean, giving them a completely different body plan from most other marine animals!
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