BIOL110 Lecture Notes - Lecture 17: Homoscleromorpha, Hexactinellid, Calcareous Sponge
23 Nov 2017
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Key terms: choanoflagellates, choanocytes: flagellated cells in sponges used for trapping for trapping food and sperm (in collar, sponge loop, spicules, monoecious/diecious. Without skeleton or with siliceous spicules but no axial filament. Have siliceous spicules around axial filament, spongin fibers, or both. Note: spicule chemistry used to classify sponges like calcarea, hexactinellida, demopongiae, Homoscleromorpha: characters: features that vary b/w species, homologous: characters passed from ancestors, ancestral: character found in common ancestor, derived: modified form of a feature found in common ancestor, that is found in a descendent. How they move: embryos are free-swimming (flagella and cilia) allow migration. Asconoid: pipe structure, pores on outside that let water come in, syconoid, shape increase surface area increase water in contact increase water filtered. Internal chambers/cavities=more surface area=therefore more food collection, more complex flagellated: recall: flagella move water parallel to tail pls fact check this, cilia move water perpendicular/laterally.
