Jellyfish and Cnidarians

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Terms in this set (...)

Polyp
-Attach on pilings, shells, seaweeds, and other surfaces
-Specialized for feeding, defense, or reproduction
Medusae
- Adult stage of a jelly fish
-Usually planktonic.
-These animals release gametes into the water to create polyps and reproduce
Hydrozoans
(Class)
-A wide range of forms and
life histories.
-Many consist of feathery or
bushy colonies of tiny polyps
Siphonophores
-A type of hydrozoan that creates a floating/drifting colony
-Can be filled with gas
Example: Portuguese Man-of-war
Scyphozoans
-Large Jellyfish
-Polyps are very small and release a small juvenile medusae
-Some species skip a polyp stage
Anthozoans
-Contains most cnidarian species
-They are solitary or colonial polyps that don't have a medusae
-Gut contains septa (several thin partitions)
-Found in coral reefs, Gorgonians
Example: Sea anemones
Carnivores
-Most cnidarians are this
-Animals that prey on other animals
-
Nematocyst
-Used to hunt prey
-a fluid filled capsule containing a thread that can be quickly ejected
-Some contain toxins
Ctenophores
-Comb jellies
-Contains about 100 species
-Swim with eight rows of ciliary combs
-Live in both cold and warm waters
-Capture their prey using two long tentacles armed with sticky cells named colloblasts.