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Biology class
May 10th, 2012

2. Characteristics Sponges Cnidarians
Phylum Porifera Cnidaria
Animal x x
Invertebrates x x
Species 5,000+ 9,000+
Symmetry Assymetrical Radial
Aquatic (marine and freshwater) x x
Movement Sessile (adult) / free swimmers Sessile (adult) / free
(larvae) swimmers (larvae, adult)
Variety of colors, shapes and x x
sizes
Sexual and asexual reproduction x x
Layers 2 layers Endoderm / ectoderm
(embryonic stage)
Has no… Tissues > organs > organ system: Central nervous system (does
Nervous, digestive, muscular or have a nerve net)
circulatory systems.
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3. * Sponges * Cnidarians
Scyphozoa (jellyfish)
Anthozoa (corals
and sea anemone) Hydrozoa (hydra)
Cubozoa (box
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jellyfish)

4. * Sponges * Cnidarians
Epithelial-
like cells
Pore cells Polyp
Amoebocytes
Collar cells
Medusa
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5. * Sponges * Cnidarians
* Asexually – fragmentation, budding * Asexually – budding. Polyp or
or formation of gemmule. medusa stage.
* Sexually – Hermaphrodite. Internal * Sexually – one phase of the life
/ external fertilization cycle. Polyp (if no medusa stage
occurs) or medusa stage. External
fertilization.
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6. * Sponge * Cnidarians
* No digestive system * Prey captured by
* Filter feeding nematocyst brought to the
mouth by contraction of
tentacles and then to the
gastrovascular cavity.
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7. * Sponge * Cnidarians
* No nervous system * No CENTRAL nervous
system
* Nerve net
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