Home|Search|Identify|Taxonomic tree|Quiz|About this site|Feedback
Developed by ETI BioInformatics
Characteristics, distribution and ecology
Taxonomische classification
Synonyms and common names
Literature references
Images, audio and video
Links to other Web sites

Bronn, 1860

Sea-urchins, Sand-dollars and Heart-urchins

Description
Free-living Echinoderms with a globular, egg-shaped or flattened body. They have a compact, mostly hard test formed by regularly arranged plates carrying tubercles with movable spines.

Tube-feet
The tube-feet are arranged in 10 meridian series, not in furrows. A double pore in the test corresponds to each tube-foot.

Mouth and alimentary canal
The intestine is long and coiled. The mouth is faced downwards towards the substratum.
The anal opening is always present.

Treated taxa:
- Order Clypeastroidea
- Order Diadematoidea
- Order Spatangoidea

Sea-urchins (Class Echinoidea)