Porifera

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• Porifera
• The sponges

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Sponges

• No true tissue
• Asymmetrical (some are radial)
• Four specialized cell types
• Choanocytes- feeding, water movement
• Pinacocytes- covering cells
• Porocytes- control water flow
• Amoebocytes- transfer food, gametes, immunity,
  make mesohyle, spicules, gemmules

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Traditional Phylogeny
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Sponge types
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Sponge Anatomy
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Scypha sp.
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Scypha
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10
9
2
1
12
3
5
7
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4
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Gemmules
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Sponge Ciliated larvae
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Cnidarians

• Hydrozoa Hydras
• Scyphozoa Sea Jellies , Jelly fish
• Anthozoa- Sea Anemones

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Cnidarians

• Diploboastic Gastrodermis - Epidermis
• Radial Symmetry
• Cnidocytes- Nematocysts
• Polyp Medusa

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Polyp Medusa
Oral
Aboral
Oral
Aboral
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Cnidocytes
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Symmetry
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Hydra nutrition
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Cnidarian circulation
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Simple Nervous net
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Hydra sp.
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Cross section
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Nematocysts
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Female Male
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Obelia
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Hydranth
Gonangium
Medusa Buds
Ceonosarc
Gonotheca
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Perisarc
Hypostome
Hydrotheca
Ceonosarc
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Obelia sp. life cycle
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Obelia sp. medusae