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Unformatted text preview: Phylum Cnidaria: Class info Polyp Medusa life cycle Hydrozoa colonial/marine planula larvae polymorphism (most dimorphic) Hydra; atypical, stalk can regenerate, no medusa, freshwater, solitary asexual mostly colonial gastrozooids (capture&ingestion of prey), gonozooids (repro- duction-medusae) dactylozoids (defense), gonangia (reproductive polyp) sexual very small statocyst (equilibrium organ) ocelli (simple eyes) velum (protective coral) polyp colony-me- dusa-zy- gote-plan- ula Scyphozoa mostly marine large jellyfish- thick mesoglea short stage scyphistoma (reduced stage that undergos transverse fission by strobilation= strobilla (contains ephyrae) dominant medusa stage; no velum lappets, rhopalium (sensory organ); statocyst, pits, ocellus mouth, manubrium, 4 oral lobes (capture food), gastric pouches (contain nematocysts- connect w/ stomach, radial->ring canals= GVC) medusa- zygote- planula- scyphistom a-strobilla- ephyra (im- mature medusa) Phylum...
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- Fall '11