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Phylum Chordata

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  1. Phylum Chordata Subphylum Craniata (Vertebrata)

  2. Phylum Chordata, Subphylum Vertebrata (Craniata) • Increase in brain size & sensory apparati • Derivation of neural crest • Enclosure of anterior neural tube in cartilage/bone (neural crest derivative) • Subsequent derivation of cartilaginous vertebrae, bony jaws & cranium • Ossification of skeleton & derivation of appendicular skeleton • Two superclasses • Agnatha – without jaws • Gnathostomata – mouth with jaws

  3. Cranium Formation

  4. Vertebrae

  5. Pharyngeal Slits: From Feeding to Respiration

  6. Elaboration of Sensory Systems

  7. Subphylum (group) superclass superclass Vertebrate Cladistics

  8. Phish Phylogeny

  9. Class Myxini - Hagfish

  10. Hagfish Feeding

  11. Class Cephalaspidomorphi Lamprey

  12. Ammocoete Larvae of Lamprey • Filter feeders using pharyngeal slits

  13. Lamprey

  14. Lamprey Feeding

  15. Lamprey Wound

  16. The terrifying development from the terrifying pharyngeal pouches

  17. Development of Jaws

  18. Class Chondrichthyes – Cartilaginous Fish

  19. Class Chondrichthyes Subclass Elasmobranchii • sharks & skates & rays • Skates • Fleshy tail, 2 dorsal fins, sometimes caudal fin • Lay egg case (mermaid’s purse) • Rays • Narrow tail without fins, with spines

  20. Class Chondrichthyes Subclass Elasmobranchii Caudal fin

  21. Unique Sensory Structures

  22. Chondrichthyes Anatomy Rostrum

  23. Subclass Holocephali – Chimeras

  24. Chondrichthyes Reproduction • Internal fertilization • Males have claspers between pelvic fins • Reproductive modes • Oviparous • Fertilized egg is laid • Ovoviviparous • Egg develops within female and living young are born • No placenta or placental structures • Viviparous • Embryos develop within female and living young are born • Some placenta-like structures of maternal origin

  25. Group Osteichthyes – bony fish • Class Actinopterygii – ray-finned fish • subclass Neopterygia • subclass Chondrostei • Class Sarcopterygii – fleshy-finned fish seahorse flying fish grouper coelacanth lungfish

  26. Fish Scales

  27. Types of Fish Scales

  28. Fish Scales Allow Age Determination

  29. Teleost Anatomy

  30. General Body Form

  31. Fish Tales?

  32. Primitive Bony Fish – Subclass Chondrostei • Nonteleost bony fish • Heterocercal tail • Ganoid scales • Lungs Gar

  33. Subclass Neopterygia – • Teleost • Swim bladder • Two dorsal fins • Homocercal tail Bass Tuna Salmon Walleye

  34. Class Sarcopterygii – Lungfish & Coelocanth

  35. Buoyancy

  36. Respiration

  37. Osmotic Regulation

  38. Weird Fish Structures

  39. Life Cycle of Salmonids