class Echinoidea


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Related to class Echinoidea: class Holothuroidea, class Crinoidea
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Noun1.class Echinoidea - sea urchins and sand dollarsclass Echinoidea - sea urchins and sand dollars  
Echinodermata, phylum Echinodermata - radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers
sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells
Exocycloida, order Exocycloida - flat sea urchins
order Spatangoida, Spatangoida - heart-shaped sea urchins
class - (biology) a taxonomic group containing one or more orders