Paleechinoidea
Paleechinoidea , noun, plural
[New Latin See Paleo-, and Echinoidea.]
(Zoology) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.
Paleechinoidea , noun, plural
[New Latin See Paleo-, and Echinoidea.]