class echinoidea

English Thesaurus

1. sea urchins and sand dollars (noun.animal)

hypernym	:	class,
definition	:	(biology) a taxonomic group containing one or more orders (noun.group)

member holonym	:	sea urchin,
definition	:	shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells (noun.animal)

member holonym	:	exocycloida, order exocycloida,
definition	:	flat sea urchins (noun.animal)

member holonym	:	order spatangoida, spatangoida,
definition	:	heart-shaped sea urchins (noun.animal)

member meronym	:	echinodermata, phylum echinodermata,
definition	:	radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers (noun.animal)