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22 Cards in this Set
- Front
- Back
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spicules
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one of the minute calcareous or siliceous skeletal bodies found in sponges, radiolarians, soft corals, and sea cucumbers.
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spongin
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fibrous, collagenous material making up the skeletal network
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ostia
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tiny openings for water
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oscula/osculum
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large openings for water
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choanocytes
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openings are connected by a system of canals, some of which are lined with peculiar flagellated collar cells
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spongocoel
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water enters through microscopic dermal pores into a large cavity which are lined with choanocytes
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asconoids sponges
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have the simplest organization
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syconoids sponges
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look somewhat like larger editions asconoids
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radial canals
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canals along the ambulacra radiating from the ring canal of echinoderms
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incurrent canals
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water enters through a large number of dermal ostia and then filters
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prosopyles
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tiny openings that go into the radial canals
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mesohyl
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sponge cells are loosely arranged in a gelatinous matrix
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pinacocytes
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flattened cells composing dermal epithelium in sponges
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pinacoderm
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the layer of pinacocytes in sponges
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myocytes
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contractile cell in sponges
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choanocytes
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line flagellated canals and chambers, are ovoid cells with one end embedded in mesohyl and the other exposed
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archaeocytes
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are ameboid cells that move about in the mesohyl and carry out a number of functions
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sclerocytes
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secrete spicules
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spongocytes
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secrete the spongin fibers of the skeleton
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collencytes
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secrete fibrillar collagen
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lophocytes
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secrete large quantities of collagen but are distinguishable morphologically from collencyes
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intracellular
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occurring within a body cell or within body cells
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