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Superclass Osteichthyes bony fishes

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Superclass Osteichthyes bony fishes. Class Actinopterygii Ray finned fishes Class Sarcopterygii (lobe fin fishes) Lung fishes Coelocanth. Class Actinopterygii. Class Actinopterygii characteristics. bony dermal scales: ganoid, cycloid and ctenoid. Class Actinopterygii characteristics.

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superclass osteichthyes bony fishes
Superclass Osteichthyes bony fishes
  • Class Actinopterygii
    • Ray finned fishes
  • Class Sarcopterygii (lobe fin fishes)
    • Lung fishes
    • Coelocanth
class actinopterygii characteristics
Class Actinopterygiicharacteristics
  • bony dermal scales: ganoid, cycloid and ctenoid
class actinopterygii characteristics6
Class Actinopterygiicharacteristics
  • paired fins and gills
  • well developed skull with 60 bones
  • Notochord; persists in some absent in others
  • Homocercal tail
  • bony skeleton
  • Operculum covering gills- more effective respiration
class actinopterygii characteristics7
Class Actinopterygiicharacteristics
  • heart is 2 chambered, 4 pairs of aortic arches
  • have a mesonephritic kidney
class actinopterygii characteristics8
Class Actinopterygiicharacteristics
  • sexes separate; fertilization is usually external;
    • oviparous (lay eggs); most
    • some are ovoviviparous (eggs develop in female and she gives birth to live young
class actinopterygii characteristics9
Class Actinopterygiicharacteristics
  • Osmoregulation
    • in freshwater fishes
      • the fish is hyperosmotic and
      • therefore the kidney is used to get rid of excess water
class actinopterygii characteristics10
Class Actinopterygiicharacteristics
  • Osmoregulation
    • in marine fishes
      • the fish is hypoosmotic
        • have lower salt content in blood than in sea water
        • so they tend to gain salt and lose water.
class actinopterygii characteristics11
Class Actinopterygiicharacteristics
  • have a swim bladder; some have lost it;
    • swim bladder allows for fishes to maintain themselves in water column without expending much energy
    • a floatation devise
    • Swim bladders probably evolved from lungs of primitive bony fishes.
class actinopterygii characteristics12
Class Actinopterygiicharacteristics
  • Two types of swim bladders:
    • The swim bladders first were attached to the digestive system
      • i.e., at the esophagus by a pneumatic duct that allowed the bladder to be filled and emptied of air.
    • In advanced bony fishes this connection is lost and the swim bladder is separate from esophagus.
      • They have a very specialized gland called the rete mirabilis
        • which is able to keep the pressure in the swimbladder stabiliz
class actinopterygii characteristics13
Class Actinopterygiicharacteristics
  • Two types of migration seen in fishes
    • Anadromous-
      • migrating from salt water to freshwater to reproduce;
      • spend adult life in sea
      • ex. salmon (born in freshwater then migrate to sea when reach adulthood migrate back to spawning grounds)
    • Catadromous -
      • migrating from freshwater to salt water to reproduce;
      • spend adult life in freshwater
      • ex. eels (born in Sargassum Sea migrate to rivers in
feeding in fishes
Feeding in Fishes
  • Carnivorous - prey on large variety of animals
  • Herbivorous - eat plants
  • Omnivorous - eat both plants and animals
  • Filter Feeders - able to filter water of plankton and detritus
  • Scavengers - feed on decaying plants and animals
  • All the above have to do with mouth morphology
class sarcopterygii lobe finned fishes
Class Sarcopterygiilobe finned fishes
  • Have a fleshy lobe at base of paired fins
    • Precursor of appendage to support body
  • Diphycercal tail
  • Includes
    • Lungfishes
    • Coelocanth
  • Only 7 species exit worldwide