Echinozoa

Echinozoa; Temporal range: Early Ordovician–Present PreꞒ Ꞓ O S D C P T J K Pg N
	The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	Echinozoa
Classes
	Echinoidea or sea urchins Holothuroidea or sea cucumbers Ophiocistioidea † Helicoplacoidea † † = Extinct

Echinozoa is a subphylum of free-living

pinnate structure.^[1] Their two extant classes are the sea urchins and the sea cucumbers

References

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