Echinoidea

常见例句

Any of various thin, circular echinoderms of the class Echinoidea, especially Echinarachnius parma, of sandy ocean bottoms of the northern Atlantic and Pacific.
沙錢，餅海膽：任一種海膽綱的瘦且圓的棘皮類動物，尤指外劍虱目，生活於北大西洋和太平洋沙質洋底
"echinoid:an echinoderm of the class Echinoidea, which includes the sand dollars and sea urchins."
"海膽:一種屬於海膽綱的棘皮動物;包括沙錢和海膽.;"