Phylum Chordata: Fishes

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Phylum Chordata: Fishes

  1. 1. Phylum Chordata
  2. 2. Characteristics Hollow nerve chord Notochord Gill slits/Pharyngeal pouches Digestive tube Post anal tail
  3. 3. Group of Vertebrates Fishes Amphibians Reptiles Birds Mammal
  4. 4. Fishes Water dwelling vertebrates that may have scales, fins and throats with gill slits. Close circulatory system. Contains tube like kidneys. Most species have separate males and females. External fertilization.
  5. 5. Classes of Fish Class Agnathostomata (Lampreys and Hagfishes) Class Chondrichthyes (Shark, Rays, and Skates) Class Osteichthyes (Tuna, Carp, Salmons, Stugeons)
  6. 6. Class Agnathostomata
  7. 7. Characteristics oAbsence of jaws oLack paired fins (Pelvic and pectoral) oSkeleton made of cartilage oRound eel-like body with a compressed caudal fin
  8. 8. Characteristics oSoft skin devoid of scales oLack swim bladders and gill covers (Operculum) oTwo chambered heart oLateral lines oNo external ears and eyelids instead Otoliths oExternal Fertilization oOviparous
  9. 9. Class Chondrichthyes •Great white sharks swim constantly with their mouth slightly open to allow water to pass in and out through their gills. •Source: http://channel.nationalgeographic.com/ Carcharadon carcharias
  10. 10. The manta ray is the largest ray and one of the five largest species of fish in the world. Manta is a Spanish word meaning “blanket.”
  11. 11. Characteristics oSkeleton made of cartilage oBody covered with triangular placoid scales oVentral subterminal mouth with several rows of triangular teeth.
  12. 12. Characteristics oInternal fertilization oOvoviviparous oTwo chambered heart oNo external ears and eyelids
  13. 13. Class Osteichthyes Yellow Fin Tuna
  14. 14. White Sturgeon
  15. 15. Carp
  16. 16. Salmon
  17. 17. Characteristics oSkeleton made of bones oLateral lines oTwo chambered heart oOperculum covering the gills oSwim bladder
  18. 18. Characteristics oPaired fins made of rays and spines or lobed fins lacking the rays and spines. oVarious types of scales (ctenoid, ganoid, cycloid) oExternal fertilization oSpawning and oviparous oNo external ears and eyelids

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