Starfish are echinoderms, a form of invertebrate marine animals known for radial symmetry and having spiny skin. Researchers said most animal species have similar genetic structures, prompting ...

Echinoderms such as starfish are unusual for their five-fold body symmetry. Maps of gene-expression patterns show how this body plan was acquired, and that the genes specifying head structures do ...

Echinoderms, Cnidarians, & The Gastropods That Parasitize Them Dr. M March 23, 2008 Aclidae Cerithiopsidae Cnidaria Crinoid Echinodermata Epitoniidae Eulimidae Fire Urchin Gasrtopod Janthina ...

Sand dollars and kin are called spiny skinned animals and classified as echinoderms (from the Greek echinos = spines and derm = skin).

An ancient echinoderm fossil preserves evidence of tube feet like those found on today’s sea stars.

The evolution of the sea star, sea urchin, and other echinoderms’ body shape during the Cambrian and Ordovician periods was faster and more dramatic than their ecological innovation, according ...

This is a preview. Log in through your library . Abstract The new Class Coronoidea is proposed to include five genera of Ordovician-Silurian blastozoan echinoderms--Stephanocrinus, Mespilocystites, ...

Echinoderms (e.g. starfish and sea urchins) are an ideal group with which to investigate the tempo and mode of the Cambrian explosion because they have a rich Cambrian fossil record, including several ...

The impact on levels of carbon dioxide in the Earth's atmosphere by the decaying remains of a group of marine creatures that includes starfish and sea urchin has been significantly underestimated.

Homalozoans include four classes of non-pentamerous Paleozoic echinoderms: Homostelea (cinctans), Ctenocystoidea (ctenoid-bearing homalozoans), Homoiostelea (solutes), and Stylophora (cornutes and ...

Mollusks get both larger and smaller than all the Echinoderms and they are more diverse both in terms of number of species and the ecological niches they fill. If you don’t believe me that Mollusks ...