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Phylum Porifera (Sponges) Picture Pictures Picture General Charac. • Sessile • Big or small • Encrusting, vase-like, etc. Visible Openings • Osculum • One or many Outer Layer • Epithelial cells ♦ Protect and enclose ♦ Provide limited motion • Porocyte cells Inner Layer • Lined with collar cells Collar Cells • Tubes and flagellum • Flagella move to create current • Filter several gallons per day! Skeleton • Between inner and outer layers ♦ Soft and springy – spongin ♦ Stiff – spicules • Both produced by amoebocytes Kinds of Spicules Porifera Feeding • Filter feeders • Bacteria, detritus, plankton Sponge Reproduction • Hermaphroditic • Eggs and sperm produced at different times • Also budding – asexual Other Body Systems • None!! Sponge Ecology • Few predators – too prickly • Some crabs place on back • Cavities homes for other animals Label • Workbook pages 49 and 50 Start Blue Planet DVD