Jellyfish n' Shit
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| 5 characteristics of Cnidarians | 1. Radial Symmetry
2. Diploblastic Organization
3. Nematocysts
4. Polymorphism
5. Nerve net
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| Diploblastic | Two germ layers
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| What are the 2 germ layers? | Ectoderm and endoderm
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| Endoderm forms the... | Gastrovascular cavity
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| Mesoglea | Jelly-like layer formed from endoderm or ectoderm
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| Function of mesoglea | Functions as hydrostatic skeleton
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| What are the two main body forms? | Polyp and Medusa
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| Usually asexual and sessile; mouth surrounded by tentacles | Polyp Body Form
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| Dioecious; free-swimming; has more mesoglea | Medusa form
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| Where is the nerve net located? | Just below epidermis
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| Function of nerve net? | Detects touch, balance, and engages in photoreception
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| Four classes of Cnidaria? | 1. Hydrozoa
2. Scyphozoa
3. Cubozoa
4. Anthozoa
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| True Jellyfish | Class scyphozoa
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| Box Jellies | Class Cubozoa
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| Corals and anemones, sea fans, and sea pansies | Class Anthozoa
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| What are the two characteristics of hydrozoa? | 1. Nematocysts are only in the epidermis
2. Medusa has a velum
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| Describe the velum | Goes around bottom of organism; almost like a hem at the bottom of the jellyfish to keep the bell from fraying, like blue jeans
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| Classification of Obelia | Obelia is a genus in the class Hydrozoa
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| Lives in colonial polyp form | Obelia
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| Function of hydranth in obelia | Feeding
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| Function of nematocysts | Sting prey
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| Function of gonangium | Reproduction
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| Function of Planula Larva | Disperse
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| Order of Obelia life cycle? | 1. Colony
2. Medusa Bud
3. Medusa
4. Planula
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| Portuguese Men of War belong to the class.... | Hydrozoa
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| What are the 2 important characteristics of class schyphozoa? | 1. Nematocysts occur in epidermis AND gastrodermis
2. Medusa lacks velum
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| The genus Aurelia is more commonly known as | Moon jelly
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| Is Aurelia monoecious or dioecious? | Dioecious
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| Rhopalium | Olfactory and chemo-detection sensory pit found in adult medusa
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| Statocyst | Tells Aurelia (moon jellies) if they're upright or not
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| Ocelli | In Aurelia, detects light and dark
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| Life cycle of Aurelia | 1. Adult Medusa
2. Planula Larva
3. Scyphistoma
4. Strobila
5. Ephyra
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| What are the 4 important characteristics of class Cubozoa? | 1. Nematocysts located in gastrodermis and epidermis
2. Venom is cardiotoxic
3. They have a more advanced nervous system
4. Medusa has velarium; tentacles hanging from four corners from a pendalium
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| Pedalium | A stalk which bears one or more long, slender, hollow tentacles
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| Chironex Fleckeri | A species under the class Cubozoa; highly fatal; 1 chironex could kill 60 people; death in approximately four minutes; causes hypertension, heart failure, and lung edema
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| Why are cubozoans so toxic? | Feed on prawn
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| What are the 3 important characteristics of class Anthozoa? | 1. Nematocysts occur in gastrodermis and epidermis
2. Venom is neurotoxic
3. No medusa, only polyps
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| A ciliated groove at one or both ends of the mouth of sea anemones and some corals; extends into a pharynx and is used to create currents of water into the pharynx | Siphonoglyph
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| What do anemones eat? | Fish, worms, and zooplankton
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| What kind of skeleton do corals have? | Calcium carbonate
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| What type of dinoflagellate helps corals form reefs? | Symbiodinium (zooxanthellae)
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| What is the life cycle of Anthozoans? | 1. Polyp adult (produces gametes)
2. Planula larva (grows into adult and cycle repeats)
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| Phylum Ctenophora | Comb jellies
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| How are Ctenophora similar to Cnidaria? | They both have diploblastic body walls, radial symmetry, and epidermal nerve nets
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| Adhesive cells on tentacles used to capture prey in Ctenophora | Colloblasts
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Created by:
rachel_robinson1026
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