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PHYLUM CNIDARIA,[object Object],BY: ANDREW QUINTOIS,[object Object]
FOUR DIVISIONS OF CNIDARIANS,[object Object],1. SCYTHOZOA (jellyfish),[object Object],2. CUBOZOA (square shaped jellyfish),[object Object],3. HYDROZOA ( hydras),[object Object],4. ANTHOZOA ( corals & sea anemones),[object Object]
Phylum cnidaria
 TWO BODY FORMS,[object Object]
CHARACTERISTICS,[object Object],SUPPORT,[object Object],Instead of bones, hydrostatic skeletons use a coelom, or a fluid-filled space separating the digestive tract from the outer body wall..,[object Object],Hydrostatic skeletons are useful for locomotion because of their flexibility. Jellyfish use them to open and close their heads, (known as bells) causing them to move.,[object Object]
CHARACTERISTICS CONT.,[object Object],CELLS AND TISSUES,[object Object],Most Cnidarians are diploblastic (composed of two layers of cells).,[object Object],Outer layer – Ectoderm (epidermis),[object Object],Inner layer – Endoderm (gastrodermis),[object Object],These layers contain nerve nets.,[object Object]
CHARACTERISTICS CONT.,[object Object],NERVOUS SYSTEM,[object Object],Cnidarians contain a nerve net.,[object Object],A nerve net is a web like system of neurons. (mainly a characteristic of radially symmetrical animals),[object Object]
CHARACTERISTICS CONT.,[object Object],RESPIRATION AND CIRCULATION,[object Object],Nutrient molecules are passed by diffusion to the rest of the body from the cells of the gastrodermis.,[object Object]
CHARACTERISTICS CONT.,[object Object],DIGESTION AND EXCRETION,[object Object],The basic body plan of cnidarians is a sac with a central digestive compartment called a gastrovascular cavity (a single opening functioning as both a mouth and anus).,[object Object]
CHARACTERISTICS CONT.,[object Object],REPRODUCTION,[object Object],Cnidarians can reproduce both sexually and Asexually.,[object Object],Asexual reproduction is seen in polyps, while sexual reproduction is seen in medusas.,[object Object]
Phylum cnidaria
CHARACTERISTICS CONT.,[object Object],SYMMETRY,[object Object],All cnidarians have radial symmetry.,[object Object],This means that they have a body shape similar to that of a pie or a barrel.,[object Object]
CHARACTERISTICS CONT.,[object Object],NEMATOCYSTS/TENTACLES,[object Object],The body contains long structures called tentacles that can be moved to capture prey.,[object Object],The tentacles contain stinging cells called cnidocytes and within each one is a capsule called a nematocyst, which discharges to either trap or sting the prey.,[object Object]
LINKS,[object Object],http://www.youtube.com/watch?v=6zJiBc_N1Zk,[object Object],Nematocysts Firing,[object Object],http://www.youtube.com/watch?v=-Tp38DUjUnM&NR=1,[object Object],How Jellyfish sting,[object Object],http://www.youtube.com/watch?v=Kukv0AtIVdU&feature=related,[object Object],Hydra,[object Object]

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Phylum cnidaria

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