Palaeechinoidea
plural noun
Palae·echinoidea
Definition of Palaeechinoidea
in some classifications
: a division of extinct chiefly Paleozoic sea urchins having the test usually composed of more than 20 meridional rows of plates that often overlap and jaws always present — compare euechinoidea
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“Palaeechinoidea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Palaeechinoidea. Accessed 16 Apr. 2021.
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