Sea urchin - Wikipedia Sea urchins are members of the phylum Echinodermata, which also includes starfish, sea cucumbers, sand dollars, brittle stars, and crinoids Like other echinoderms, they have five-fold symmetry (called pentamerism) and move by means of hundreds of tiny, transparent, adhesive "tube feet"
Sea urchin | Description, Anatomy, Facts | Britannica Sea urchins live on the ocean floor, usually on hard surfaces, and use the tube feet or spines to move about In addition, a few carnivorous species have been described The largest urchin (known from a single specimen) is Sperostoma giganteum of deep waters off Japan
Sea Urchin - Types, Anatomy, Classification, Reproduction Lifecycle Sea urchins, or simply urchins, are globular echinoderms that belong to the class Echinoidea These animals begin their life as bilaterally symmetrical larvae, but most species develop into adults with a five-fold symmetry
Shock Discovery Reveals Sea Urchins Are Basically All Brain Sea urchins may just look like a ball of spikes waiting to be stepped on at the tide pool, but there's much more to these barbed beasts than just roe and teeth New research reveals sea urchin nervous systems are far more complex than we knew These creatures, it turns out, possess 'all-body brains
Invertebrates of Interest: Sea Urchin Visitors can learn more about urchin species identification, biology, habitat, geographic range, fishing methods, and more in the following links For the latest information, see the Federal Fishery Disaster Relief page
Sea Urchin: The Marine Invertebrate - Ocean Info A sea urchin is a marine invertebrate characterized by its spines They are found in all oceans of the world, from shallow coral reefs to deep-sea environments