cnidaria the stingers by: doug lang. characteristics inter-cell connections carpet-like basement...
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CNIDARIA
T HE S
T I NG
E RS
BY :
DO
UG
LA
NG
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CHARACTERISTICS
• Inter-cell connections
• Carpet-like basement membranes
• Muscles
• Nerve net
• Statocyst
• Hydrostatic skeleton
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ANATOMY
• Tentacle
• Nematocyst
• Mouth
• Gastrovascular cavity
• Bud
• Ocelli
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DIGESTION
Eating-
• Predation
• absorb dissolved chemicals
• filter food particles from water
• Two-way digestion
Digestive waste-
• Enzymes reduce prey to slurry
• Gastroderm cells absorb nutrients
• Indigestible remains of prey go out mouth
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RESPIRATION
• no respiratory organs
• Gas exchange over body surface
• Some pump water in and out of digestive cavity without opening mouth
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INTERNAL TRANSPORT
• Do not have a organized internal transport
• Large gastrovascular cavity carries partially digested food through body
• Do not have any blood
• Gellationous material throughout their body
• The gellationous material is a storage unit for oxygen
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EXCRETION
• Prey is broken down into slurry by enzymes
• Absorbs the nutrients
• After absorbed cells digest nutrients that takes a few days
• Releases the Indigestible remains out of the mouth
• Water currents remove cells’ internal processes (ammonia)
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RESPONSE
• Nerve net
• Special cells cause contractions of muscle-like tissue• Movement of tentacles during prey capture
• Sensor organs
• No brain
• No eyes
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MOVEMENT
• Only move when they are at the jelly fish stage.
• Hydrostatic Skeleton
• Some use jets to propel them
• Some are sessile
• Some sea anemones can slowly creep over rocks
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REPRODUCTION
• Sexually
• Mass spawnings can make the water cloudy from so much gametes
• Water temperature lighting conditions trigger the spawning
• Asexually
• Polyps bud and occasionally split down the middle or above base
• Medusa split down the middle
• Larva stage, Polyp stage, Polyp strobilates, and Medusa stage
1-3 larva searches for site4-8 Polyp grows9-11 Polyp strobilates12-14 Medusa grows
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EXAMPLES
• Sea Anemone
• Jellyfish
• Corals
• Sea Pens
• Box Jellies
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FACTS (AKA FUN FACTS)
• The word Cnidaria comes from the Greek word “cnidos” that means stinging nettle
• Clownfish and Sea anemones have a symbiotic relationship
• Urinating on a jellyfish sting could make it worse or make it better
• Most corals do sting
• 130 different species have been recorded in Sydney Harbor
• Nematocysts fire tiny harpoon-like spears loaded with venom into prey.
• The firing of nematocysts is the fastest reaction in the animal kingdom.
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LITERATURE CITED
• http://en.wikipedia.org/wiki/Cnidaria#Feeding_and_excretion
• http://cnidarianh.blogspot.com/2007/02/feeding-respiration-excretion.html
• http://cnidarianh.blogspot.com/2007/03/movement.html
• https://www.boundless.com/biology/textbooks/boundless-biology-textbook/the-musculoskeletal-system-38/types-of-skeletal-systems-215/hydrostatic-skeleton-exoskeleton-and-endoskeleton-812-12051/
• http://cnidarianh.blogspot.com/2007/02/internal-transport.html
• http://phylum-cnidaria.wikispaces.com/FUN+FACTS
• http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch7invertebrates/Invertwp/invert_wp_05/cnidaria/miles1/Cool.htm