This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: animals a flowerlike or plantlike appearance (hence the term sea lily). Crinoid stalks and blastoid heads are common fossils in certain parts of North America. The Class Holothuroidea The class Holothuroidea has 1,500 species of sea cucumbers. Sorry, these are NOT good eating as a general rule! Holothuroideans have a long leathery body, and feed by tentacles located around their mouth. The Class Echinoidea Scientists generally place about 950 species of sea urchins and sand dollars are in the class Echinoidea. Both sea urchins and sand dollars have spines thar they use for locomotion, defense, and burrowing. Sea urchins have long, blunt spines. Sand dollars are flattened with a five-part flowerlike pattern of pores for skin projections....
View Full Document
- Fall '10
- Biology, Water vascular system, Sea urchin, sea urchins, sand dollars