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16 Cards in this Set
- Front
- Back
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Porifera
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Sponges. Marine group with some freshwater. No organs or true tissue, asymmetrical and sessile, no nervous system, intracellular digestion.
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Ostia.
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Small openings for incoming water.
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Oscula
Singular: Osculum |
Large water outlets that connect by a system of canals. Some are lined with peculiar flagellated collar cells.
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Choanocyctes
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Flagellated collar cells that line internal canals and chambers
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Spongocoel
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Central cavaity
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Pinacocytes
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Line outer Often contractile
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Myocytes
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Control shape and water flow
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Porocytes
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Tubular cells that line Ostia of asconoid sponges which let water flow.
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Mesohyl
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Sponges matrix. The connective tissue of the sponges
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Archaeocytes
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Ameboid cells that move through the mesohyl.
Digest, transport and store food Secrete spicules or spongin Turn into other cells |
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Intracellular
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Occurs within the cell.
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Mesohyl is supported by:
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Spicules-CaCO3 or SiO2 & Spongin-protein
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Ascon (body form) Asconoids
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single large osculum. Choanocytes line spongocoel. Tube shaped
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Sycon (body form) Syconoids
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folded body wall. Choanocyctes line radial canals.
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Reproduction
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Choanocytes under go meiosis
either the sperm or the Fertilization is internal inside the mesohly |
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Parenchymula
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Planktonic larvae are released during meiosis and settle after two days
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