BIOL 121 Lecture Notes - Lecture 17: Zygote, Spongin, Choanocyte
12 Apr 2015
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Document Summary
Aquatic marine, coastlines of n. atlantic, in intertidal zones attached to rocks or large algae. Chemoheterotrophic filter feeder, flagellated choanocytes draw water through body, trap food particles and then amoebocytes transport food through rest of sponge. Spicules & spongin indigestible, very few predators. Cells also produce & store chemicals to deter predators. After fertilization zygote/embryo are kept within tissues for protection. Sexually gametic life cycle, mobile sperm swim to another sponge, zygote grows into embryo within tissue of parent sponge, flagellated larvae released from parent and swims to new areas. Aplysina stove pipe sponge, large, deep- sea sponges.
