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Excretory & Reproductive Anatomy

Excretory & Reproductive Anatomy. Excretory & Reproductive - Close anatomical ties. Typical vertebrate arrangement Excretory and reproductive anatomy closely tied May share common ductwork in some individuals. Excretory/Reproductive Systems. General locations. Kidneys.

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Excretory & Reproductive Anatomy

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  1. Excretory & Reproductive Anatomy

  2. Excretory & Reproductive- Close anatomical ties • Typical vertebrate arrangement • Excretory and reproductive anatomy closely tied • May share common ductwork in some individuals

  3. Excretory/Reproductive Systems

  4. General locations

  5. Kidneys

  6. Excretory/Reproductive Systems • Systems lie in close proximity to one another within body cavity

  7. Excretory System • Pronephros - functional in adult hagfish, fish embryos

  8. Excretory System • Mesonephros - portion of functional kidney in adult fish

  9. Typical connections with circulatory system

  10. Fish kidneys • Diffuse organs on either side of vertebral column • Varying degree of connection with reproductive system • Little connection in most advanced fishes

  11. Shark kidney • Sharks and relatives have close ties between kidneys and testes • Share ductwork

  12. Kidneys and urinary bladder • Some fish have a urinary bladder • Located at end of ureter(s) • More often present in male fish

  13. Hagfishes • Monoecious - all individuals have capacity to be either male or female • Single gonad can develop into testis or ovary • Can it switch or be both at same time?

  14. Hagfish ovary • Produces few, large eggs • 1 or 2, or up to 30, depending on species

  15. Hagfish ovary • Eggs get dumped into body cavity before exiting body • Internal/self fertilization?

  16. Lamprey ovary or testis • Lampreys are male or female • Single ovary or testis • Reproductive products dumped into body cavity before exiting (no ductwork)

  17. Class Chondrichthyes • Sexes separate and fertilization internal • Oviparous, ovoviviparous, viviparous

  18. Shark testes • Paired testes • Located near anterior end of body cavity

  19. Testes with ducts

  20. Ductwork • Ducts convey sperm to storage area • Stored until copulation

  21. Female sharks

  22. External sex characteristics • Pelvic claspers in males • Aid in sperm transfer to female • Female with simple cloacal opening

  23. Other characteristics • Male sharks, chimaeras may have head clasper as well as well as pelvic clasper • Not used in sperm transfer

  24. Bony fishes-paired gonads

  25. Bony fishes • Most bony fish are dioecious (male and female) • Gender differences not always very apparent • Tubercles may develop in males

  26. Breeding or nuptial tubercles

  27. Bony fishes • Others may develop vivid colors • Males boldly marked • Many minnows, darters

  28. Bony fishes • Fertilization is usually external (oviparous) • Female ejects eggs, male ejects sperm (milt)

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