EEB266 Lecture 2 - Proferia.docx

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Ecology & Evolutionary Biology
David Zamparo

EEB266 Lecture 2 - Porifera - Skeleton composed of geometrical spicules - Possession of porocytes and choanocytes - All sponges belong to one clade - A common ancestor “invaded” fresh water only ONCE - 8000 marine species, 150 freshwater species Synapomorphies: Pinacoderm: outer surface (epithelial-like) Mesohyl: connective gel like tissue Spicules: skeleton fibers Choanocytes: create directional water flow, flagellum, water moves faster higher up Porocytes: openings Archaeocyte: unspecialized “stem cell”, totipotent, undifferentiated has potential to become any of the cells Three Functional Body Types: Asconoid: smallest Syconoid: a collection of asconoids, shares spongocoel Leuconoid: a collection of syconoids, shares spongocoel Three Classes: Calcarea: leucon and syconoid sponges with calcareous spicules (CaCo ) secre3ed extracellularly Hexactinellida: complex sponges with siliceous (SiO , Sil2ca) secreted intravellularly, and lacking pinacoderm Desmospongiae: keratinous (sponging) skeleton, with or without siliceous spicules, but secreted extracellularly Movement: - Some capable of moving 1-4mm a day, through the collective movement of the pinacocytes -
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