Echinoida is an order of sea urchins in the class Echinoidea. They are distinguished from other sea urchins by simultaneously possessing both an un-sculpted test and a feeding lantern with large plates fused across the top of each pyramid.
Echinoida is an order of sea urchins in the class Echinoidea. They are distinguished from other sea urchins by simultaneously possessing both an un-sculpted test and a feeding lantern with large plates fused across the top of each pyramid.
==Taxonomy== Order Echinoida family Echinidae Gray, 1825 family Echinometridae Gray, 1825 family Parasaleniidae family Strongylocentrotidae Gregory, 1900
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).