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 ...

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

Rich Mooi, Bruno David, Evolution within a Bizarre Phylum: Homologies of the First Echinoderms, American Zoologist, Vol. 38, No. 6 (Dec., 1998), pp. 965-974+991 ...

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

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 ...

Scientists are retracing the journeys of century-old Antarctic expeditions to discover how the Earth has changed.

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

This exercise illustrates the two major features that all members of the Phylum Echinodermata have in common - the water vascular system and pentaradial symmetry. The take home message is that all ...

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 ...