Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone....

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Invertebrate Notes

Transcript of Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone....

Page 1: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.

Invertebrate Notes

Page 2: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.
Page 3: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.
Page 4: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.

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.

Page 5: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.
Page 6: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.

• 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.

Page 7: Invertebrate Notes. Sponges- Porifera “Pore Bearer” Show examples Evolutionary sideline - alone. Simple multicellular animals lacking true tissues.

• Asexual reproduction -

1. Extensive regeneration

2. Fragmentation or budding