BIS2C_Lect26_Ward_Development___Sponges_ppt

Choanocytes aquiferous system varies in degrees of

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Unformatted text preview: tes Aquiferous system varies in degrees of complexity Sponge features Aquiferous system: varies in complexity among different kinds of sponges asconoid sponge syconoid sponge leuconoid sponge Images from Biomedia Museum Cell types in sponge (different cell types -> multicellular) - Choanocytes + others - Pinacocytes - Amoebocytes Sponge features • Differentiated cell types (such as choanocytes, pinacocytes, and amoebocytes), but no true tissues or organs 5 Spicules - skeletal elements composed of silica or calcium carbonate Sponge features • Cells arranged in gelatinous matrix (mesohyl) with collagen and usually spicules (skeletal elements) composed of silica or calcium carbonate Siliceous spicules (glass sponges and demosponges) Calcium carbonate spicules (calcareous sponges) Sponge features: spicules Sponge features Glass sponges and demosponges: siliceous spicules Calcareous sponges: spicules of calcium carbonate Spicules of a Tethya species Images from Biomedia Museum Sponge features Glass sponges and demosponges: siliceous spicules Calcareous sponges: spicules of calcium carbonate Glass sponges (silica) Demosponges (silica) Calcareous sponges (calcium carbonate) 6 Demosponges - Some lost spicules - gained spongin (complex network of collagen) Sponge features Sponge features • Some demosponges have spongin (complex network of collagen) but no spicules: these have long been harvested for use as bath sponges • Some demosponges have spongin (complex network...
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