Cnidarians Class of

Cnidarians Characteristics Predators Examples Picture

______________

Feathery or bushy colonies or tiny polyps Polyps bud off medusas What do they eat? zooplankton Siphonophores

• Form drifting colonies of polyps but act as a ____________________________

• Some have specialized gas filled float • Transparent tentacles up to 165 feet long • Deadly with painful sting from toxins in

nematocysts

Fish, crustaceans, and mollusks like sea slugs

Hydra Siphonophores Example: ____________________

“True Jellyfish”

Large medusa (dominant life form) with hanging tentacles with mouth underneath May reach diameter of 6 feet Arms capture food, fish or crustaceans, and bring to mouth Move by pulsation ______________ (vertical) and with ______________________ (horizontal)

Sea turtles, banner fish, arrow crab, snails

Sea Nettle

Venom attacks heart, nervous system, and skin cell. How fast would you be killed if stung? ____________ If you survive, feel pain for weeks and have scar damage One of the deadliest venoms on earth Northern Australia, Southeast Asia, and Indian Ocean

Sea Turtles

Box Jellies (Sea Wasps)

______________ “Flower Animal”

General Characteristics Solitary or colonial polyps (lack medusa) No alternation of generation (ALWAYS polyps) Sessile. What do they feed on? plankton

Sea turtles, fish, sea stars, snails, and sea slugs

___________________ ___________________ ___________________

Anthozoans: Sea Anemones May live attached to rocks, shells, or burrowing in the sand/mud Are attached at their pedal disk Are sessile and can they change location? How? _________________________________________ May burrow by muscular contraction of their body. Can form a ball when attacked- What do they need to do to accomplish this? ______________________ Have mutualistic relationship (clownfish and hermit crabs) How can they reproduce? ____________________________________________________ Anthozoans: The Corals Overall they are very similar to the sea anemones What are the two main differences? Two types of corals

• ________________: make coral reefs of limestone • ________________: have flexible skeleton that breaks down after death so nothing is left behind

PHYLA ______________ “Comb Bearers”

Not a jellyfish, medusa body plan and radial symmetry Largest organism to swim by __________________ They light up when disturbed- bioluminescent Do not sting by using nematocysts. How do they get food?

Larger jellies, fish, sea turtles, sharks and others

Comb jellies aka ctenophores