210 likes | 471 Views
Cnidarians. Coral Sea anemones Jellyfish Distinguishing characteristic – stinging tentacles. Corals. Sea Anemones. Jellyfish. Body Forms. Polyp (coral, anemones) Cylinder, mouth at top Sessile Medusa (jellyfish) Umbrella-shaped Free-swimming. Body Structure.
E N D
Cnidarians • Coral • Sea anemones • Jellyfish • Distinguishing characteristic – stinging tentacles
Body Forms • Polyp (coral, anemones) • Cylinder, mouth at top • Sessile • Medusa (jellyfish) • Umbrella-shaped • Free-swimming
Body Structure • 2 cell layers – ectoderm, endoderm • Mesoglea – middle layer (gel-like) • Gastrovascular cavity
Body Symmetry • Radial • Capture food from all directions
Body Systems • Skeletal • None – hydrostatic pressure • Nervous – nerve net, no brain • Muscular – cells in bands • Jellyfish propulsion
Feeding • Tentacles sting and grasp prey • Into GV cavity via mouth • Enzyme secreted • Digestion completed by cells
Reproduction • Sexual and asexual • Budding • Regeneration
Colonies • Buds don’t break off – animals becomes branched colony
Portuguese Man-of War • Colony – medusae and polyps