Your SlideShare is downloading. ×
Marine 2 16-12
Upcoming SlideShare
Loading in...5

Thanks for flagging this SlideShare!

Oops! An error has occurred.

Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Marine 2 16-12


Published on

Published in: Technology, Lifestyle

  • Be the first to comment

  • Be the first to like this

No Downloads
Total Views
On Slideshare
From Embeds
Number of Embeds
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

No notes for slide


  • 1. Chapter 8Sponges, Cnidarians
  • 2. Review Animal Characteristics–Animals b/c have characteristics • Multicellular • eukaryotic & lack cell walls • Heterotrophs
  • 3. Phylum Porferia• Asymmetric• Sessile- attach to a substrate• Color, shapes, and size vary• Structure – System of water canals – Ostia-circulates water that carries nutrients in (via spongeocoel) and out of cell (via oscula)
  • 4. Level of Organization• Lack Organs and Tissues – Do have specialized cells • Choanocytes (collar cells) -flagella that move water into body • Pinacocytes- protection; outer layer • Archaeocytes-repair and regeneration• Body plan Evolution a.) usually in colonies-simplest b. Fist stages of folding – simple to complex c. Most efficient-most sponges have this (more efficient) body plan
  • 5. MicrocionaProlifera- red beard sponge
  • 6. Feeding and Digestion• Suspension and filter feeders• Collar cells strain food from H2O• Most food digested/stored in archaeocytes• Undigested material/waste leaves with water currents
  • 7. Reproduction• Asexual – budding (uncommon) • New sponge buds off existing adult – Fragmentation • Usually result of storms, waves, predators• Sexual – Hermaphrodites-can produce eggs or sperm (but not at same time) – Sperm is spawned into the water and enters another sponge with eggs to fertilize – Zooplankton larvae –spend time swimming before settling on substrate mode=true&persist_safety_mode=1&safe=active
  • 8. Ecological Roles• Recycle calcium• Compete with others for space• Mutualistic –serve as host for other organisms• Predator-prey: have few predators b/c don’t taste good – Hawksbill sea turtle• Commercial: polish metals, bath sponges• Medical: used in treatment of cancer
  • 9. Review: Wrapping it all up• _k&feature=related&safety_mode=true&persi st_safety_mode=1&safe=active
  • 10. Phylum: Cnidaria (pronounced "ny-DAIR-ee-an) “stinging cells”
  • 11. • Characteristics – Radial symmetry – Most have nerves and muscles • 1st animals with this complexity – Body arranged in circular pattern • 2 different plan – Polyp: benthic; mouth surrounded by tentacles – Medusa: free floating • Both have – Epidermis – Gastrovascular cavity – Stinging Cells-cnida • Used for locomotion, defense, capturing prey
  • 12. Representative organisms• Hydrozoans- colonial• Scyphozoans-true jellyfish• Anthozoans-sea anemones and corals
  • 13. Feeding and Digestion• Hydrozoans and Anthozoans: Suspension feeders – Sea anemone feed on inverts like brine shrimp• Jellyfish – Carnivorous feed on fish and larger inverts• Prey is paralyzed by a toxin, drawn into mouth, digested in Gastrovascular cavity• Waste is forced back through mouth (meaning they poop through their mouth!!!!)
  • 14. Reproduction • Variety of reproductive strategies – Asexual • Polyps produces more polyps or medusa • Hydrozoans: pinch off parts; fission – Sexual • Spawning • Can be hermaphrodites or separate sexes (jellyfish) • Go though a polyp stage and medusa stage • watch?v=06BPlLATtgc&safe ty_mode=true&persist_saf ety_mode=1&safe=active
  • 15. Ecological Roles• Harmful poisonous• Predators- have few predators--- Why???• Forms habitats (coral reefs most biodiverse ecosystem)• Mutualistic – Sea anemone and clownfish – Sea anemones and hermit crabs
  • 16. Phylum: Ctenophora• Radial symmetry• Lack stinging cells• Planktonic• Transparent• 8 rows of comb plates w/ cilia – Locomotion• Surface waters• Bioluminescence afety_mode=true&persist_safety_mode=1&safe= active
  • 17. • Feeding and Digestion – Carnivore-feed on planktonic animals – Digested in Gastrovascular cavity• Reproduction – Hermaphroditic – Spawn both eggs and sperm in water column