Jump to content

Echinozoa

From Wikipedia, the free encyclopedia

This is an old revision of this page, as edited by 2603:8000:f400:fcea:c119:5e0d:a65b:93b9 (talk) at 21:58, 29 December 2021 (Added fossil range for more understanding, so more people would know). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

Echinozoa
Temporal range: Early Ordovician–Present
The melon sea urchin (Echinus melo) in northwest Sardinia
Scientific classification Edit this 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 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

References

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


Stub icon

This echinoderm-related article is a stub. You can help Wikipedia by expanding it.

Retrieved from "https://en.wikipedia.org/w/index.php?title=Echinozoa&oldid=1062677954"