class Echinoidea

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Noun1.class Echinoidea - sea urchins and sand dollarsclass Echinoidea - sea urchins and sand dollars  
Echinoidea
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
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References in periodicals archive
Sea urchins, sand dollars, and sea biscuits (phylum Echinodermata; class Echinoidea) form a diverse group of benthic marine animals from two major lineages represented by the euechinoids and the cidaroids (Smith et al., 2006; Kroh and Smith, 2010).
Differences in Larval Arm Movements Correlate with the Complexity of Musculature in Two Phylogenetically Distant Echinoids, Eucidaris tribuloides (Cidaroidea) and Lytechinus variegatus (Euechinoidea)
Sea urchins belong to the class Echinoidea, one of four classes in the phylum Echinodermata, and here specialists describe echinoid species and represent them with images.
Echinodermata
The echinoderm class Echinoidea contains the familiar sea urchins,
Symmetry, locomotion, and the evolution of an anterior end: a lesson from sea urchins
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