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Phylum Class Order

The Nekton The Fishes. Phylum Class Order. Chordata Mammalia Cetacea Subphylum Mysticeti Vertebrata Odontoceti Carnivora Sirenia Aves Reptilia Pisces(superclass) Agnatha Chondrichthyes Osteichthyes Mollusca Cephalopoda. Nekton – The Fishes.

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Phylum Class Order

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  1. The Nekton The Fishes PhylumClassOrder ChordataMammaliaCetacea SubphylumMysticeti VertebrataOdontoceti Carnivora Sirenia Aves Reptilia Pisces(superclass) Agnatha Chondrichthyes Osteichthyes MolluscaCephalopoda

  2. Nekton – The Fishes Class Agnatha (jawless fish) Lamprey Hagfish

  3. Nekton – The Fishes Class Chondrichthyes (chondros = cartilage; ichthys = fish)

  4. Nekton – The Fishes

  5. Nekton – The Fishes Class Osteichthyes (osteum = bone; ichthys = fish)

  6. Nekton – The Fishes The bony fish are subdivided according to body shape

  7. Nekton – The Fishes

  8. Nekton – The Fishes Lungers – white myomeres Cruisers – red myomeres

  9. Nekton – The Fishes

  10. Nekton – The Fishes Aspect ratio = fin height2 fin area

  11. Nekton – The Fishes

  12. Nekton – The Fishes

  13. Nekton – The Fishes Short-nosed batfish

  14. Nekton – The Fishes mesopelagic bathypelagic

  15. Nekton – The Fishes Sex Lives of Fish (Rated: XXX) • Modes of Reproduction: • ovoparity – lay undeveloped eggs, • external fertilization, 90% of bony • fish • ovoviviparity – internal development • w/out direct maternal nourishment, • More advanced at birth (most sharks • & rays • viviparity – internal development w/ • direct nourishment from mother, • fully developed at birth, some sharks

  16. Nekton – The Fishes Hermaphroditism: • Simultaneous hermaphroditism • Sequential hermaphroditism • Protandry • Protogyny All clown fish are males except reproducing female. When female dies, largest male changes sex Female changes to become supermale • Parthenogenesis

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