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Directory Listings About Sponges... Article providing data on this animal which has approximately 15,000 different species in the world, 150 of which occur in freshwater. Only about seventeen are of commercial value. Sponges are the most primitive of the multicellular animals, containing neither true tissues nor organs. http://www.marinelab.sarasota.fl.us/SPONGE.HTM - profile Introduction to Porifera Article from UC - Berkley on the Poriferans which are commonly referred to as sponges. An early branching event in the history of animals separated the sponges from other metazoans. As one would expect based on their phylogenetic position, fossil sponges are among the oldest known animal fossils, dating from the Late Precambrian. http://www.ucmp.berkeley.edu/porifera/porifera.html - profile Sponges: The Weird Wonders of the Seas Gives an essay on this animal including a cross-section picture, types of sponges, and reproductive details. http://www.oceanicresearch.org/sponges.html - profile |
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