Part 1

Polycheates

  • Dioecious
  • Asexual reproduction for regeneration, bud off individuals genetically identical
  • Sexual reproduction Epitoky- individual polycheates will transform into epitoke (individual that is sexually mature specialized in swimming and budding). Atoke is original individuals that stays behind.
  • No gonads, gametes produced from peritoneal tissue, that surrounds celum
  • Only going to bud female if female, vice versa
  • Epitokes swim away to accomplish sexual reproduction
  • Some species show bioluminescence during reproduction. (glow worms from Turks)
  • 3 day before or after full moon during reproduction
  • The epitokes are luminescencing
  • Shedding eggs in water and males dart to eggs to fertilize
  • Male syllid- sedentary
  • Their larvae is an important synapomorphy tied to mollusks

Part 2

Vestimentiferan

  • Live really deep in ocean in abyss
  •  up to 2 meters long, 4 cm wide
  • discovered in 1977 near Galapagos Islands
  • Live near hydro thermal vents- vents that give off hot sea water that is rich in hydrogen sulfide and ch4
  • Morphology 4 main regions, 1. Gas exchange through tentacles, 2. Anterior center with glands for secretion,3.  Long trunk with rest of the worm, 4. Opisthosoma that has segments and circular and longitudinal muscle.

Rifti

  • Live inside big tubes
  • Live directly in the path out flow of the vents, bodies are being bathed in the hot water
  • Hot water mixed with the cold water makes for 10-15 centigrade 50-60 degrees f
  • Trunk contains gonads and trophosome- important on getting nutrition, contains densely packed bacteria, how they get nutrition
  • No digestive tract
  • How they get nutrition: tentacles external digestion, dissolved organic matter from sea water (active transport with low concentration gradients). Mutualistic chemosynthetic bacteria. Can take small organic compound and make them large
  • No sunlight, oxidized hydrogen sulfide in the sea water
  • Chemosynthesis: C02+4H2S+02—>(CH2O)n +4S+H2O
  • Using this equation to oxidize and produce ATP
  • Similar to photosynthesis
  • Can feed host worm either indirectly with soluble carbohydrates or bacteria populations just get digested by host.

 

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