Oct 2-08 - Sponges Lecture

Oct 2-08 - Sponges Lecture - Josh Bovard Biology 111...

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Josh Bovard Biology 111 – Thursday, October 2 nd , 2008 Professor Donald Kramer S PONGES Phylogeny/Origin : Evolved about 700 million years ago Descended from the choanoflagellates ~8000 species, most marine Quite successful, have been around for a while Due to their cellular structure, have limited coordination Cannot eat larger prey No nervous system (only genus without a formal system; only cells) : 2mm to 2m in size There are three types of structures of sponges Bath Sponges – high spongin content or SiO 2 spicules or both (very soft, no rough silicon dioxide) Calcareous Sponges – high CaCO 3 spicules Glass Sponges – SiO 2 spicules Sponges generally have large cavities The osculum is the main opening at the top Walls have pores , or ostia through which the water enters As the water circulates (with the help of flagella), choanocytes absorb the nutrient particles in the water Has a mesoglea
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Oct 2-08 - Sponges Lecture - Josh Bovard Biology 111...

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