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Invertebrate Notes
Sponges- Porifera “Pore Bearer”Show examples• Evolutionary sideline - alone. • Simple multicellular animals lacking true
tissues or organs. • Sponges evolve from colonial flagellated
protists• Benthic and sessile as adults.• Height ranges from 1cm. - 2m.• Water drawn in through pores in body and
expelled out osculum. Flagella create current.
• Filter feeders, they can filter 100 liters of seawater an hour.
• Choanocytes (collar cell) phagocytize food on inside (flagellated cell)
• Amoebocytes digest and carry nutrients from choanocytes to epidermal cells.
• Amoebocytes also form skeletal fibers - spicules (CaCO3 or silica) or spongin (protein).
• Sexual Reproduction - hermaphrodites with cross fertilization. Flagellated larvas swim and find hard substrate. Planktonic in early stages.
• Asexual reproduction -
1. Extensive regeneration
2. Fragmentation or budding