Sea urchin

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Sea urchin
Riccio Melone a Capo Caccia adventurediving.it.jpg
The sea urchin (Echinus melo) frae Sardinie
Scienteefic classification
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Echinozoa
Class: Echinoidea
Leske, 1778
Subclasses

Sea urchins or urchins, sometimes cried sea hedgehogs, are smaa, spiny, globular animals which, wi thair close kin, such as saund dollars, constitute the class Echinoidea o the echinoderm phylum.