Echinoderms are one of the most highly derived groups of animals with many species as significant components of several marine communities. They’re classified by three fundamental shared ...
"Presented as a Paleontological Society Short Course at the Annual Meeting of the Geological Society of America, Salt Lake City, Utah, October 19, 1997"--P. iv. Introduction to the Paleontological ...
Recent discoveries of long-gone marine invertebrates call into question the occurrence of a catastrophic global extinction hundreds of millions of years ago. The loss of diversity wasn’t as widespread ...
THE Holothuroidea differ from all other echinoderm classes in having a greatly reduced skeletal system. Typically, external plates are absent, while a peripharyngeal crown, anal plates, madreporite ...
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