Echinozoa

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Echinozoa
Temporal range: Early Ordovician–Present
Riccio Melone a Capo Caccia adventurediving.it.jpg
The melon sea urchin ( Echinus melo ) in northwest Sardinia
Scientific classification Red Pencil Icon.png
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 echinoderms in which the body is or originally was a modified globe with meridional symmetry. Echinozoans lack arms, brachioles, or other appendages, and do not at any time exhibit pinnate structure. [1] Their two extant classes are the sea urchins and the sea cucumbers.

See also

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References

  1. "Answers - the Most Trusted Place for Answering Life's Questions".