Cnidarians. Phyllum Cnidaria. Cnidaria : means “nettle.” Includes Jellyfish, Sea Anemones, and Corals Contains 9,000 mostly marine species Carnivorous: eat crustaceans, fishes, worms, and diatoms. 3 Classes. Hydroidea : Small, polymorphic (can be both medusa and polyps) Scyphozoa :
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Cnidaria: means “nettle.”
Includes Jellyfish, Sea Anemones, and Corals
Contains 9,000 mostly marine species
Carnivorous: eat crustaceans, fishes, worms, and diatoms.
Almost all Cnidarians have stinging cells called cnidoblastsor nematocysts.
These cnidoblasts are deployed on tentacles that end or retract toward the mouth.
Each cnidoblast has a capsule with a coiled threat that can be forcefully ejected and contains a toxin or immobilizing prey.
The tentacles bring food toward the saclike digestive cavity.
Digested food is absorbed by cells of the digestive cavity and transported to other parts of the animal by migratory cells or by diffusion.
Indigestible bones are eliminated through the mouth.
Single body cavity called and enteron
An opening surrounded by tentacles with stinging cells or cnidoblasts.
The opening functions as both the mouth and the anus.