10 Circulatory System None! Dory: I spy something pink and squishy that lacks a circulatory system!Marlin: Let me guess… a Cnidarian!Matt Maneval
11 Digestive System Digestive or gastrovascular cavity open at one end. Captures animals with nematocysts on tentacles.Matt Maneval
12 Excretory System None. Dory: They don’t have excretory systems? Gross. Marlin: That’s just wrong.Matt Maneval
13 Locomotion/Musculature Medusae swim by undulations of the bell body.Polyps are sessile.Matt Maneval
14 Reproductive CyclesHydrozans reproduce asexually by budding, the pinching off of outgrowths, when conditions are favorable.Hydrozans reproduce sexually in poor conditions by making resistant zygotes that remain dormant until conditions improve.Dan McKinney
15 Sensory StructuresMost Cnidaria have simple sensory structues distributed throughout their bodies.Some, such as Cubazoans, have complex eyes embedded on the tips of their tentacles for catching prey.A Box JellyfishDan McKinney
16 Skeletal SystemCnidaria's lack bone structure. Most are supported by water swelling in their digestive cavity or water filled cells.Coral secretes calcium carbonate exoskeletons, which when dead form coral reefs.
17 Gas ExchangeCnidarian species exchange gas through simple diffusion in and out of the cells.Dan McKinney
18 Special “Powers”Cnidarians use poisonous tentacles to capture and kill their prey. These are called nematocysts.The Box Jelly Fish is so poisonous that one sting has enough venom to kill 60 men.Dan McKinney
19 Question 1 Do hydrozoans spend most of their life in Polyp Medusa Alternate between life cyclesMatt Maneval
20 Correct Answer: C. Hydrozoans alternate between polyp and medusa throughout their life. Matt Maneval
21 Question 2 How do hydrozoans reproduce? Sexually Asexually Sexually and Asexually, depending on conditions.Matt Maneval
22 Correct Answer: C. Hydrozoans reproduce sexually and asexually, depending on the conditions. Matt Maneval
23 Question 3 What classification do Sea Anemones fall under? Anthozoans ScyphozoansHydrozoansCubozoansDan McKinney
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