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Superclass Osteichthyes - PowerPoint PPT Presentation

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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 l.jpg
Superclass Osteichthyes bony fishes

  • Class Actinopterygii

    • Ray finned fishes

  • Class Sarcopterygii (lobe fin fishes)

    • Lung fishes

    • Coelocanth

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Class Actinopterygiicharacteristics

  • bony dermal scales: ganoid, cycloid and ctenoid

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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

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Class Actinopterygiicharacteristics

  • heart is 2 chambered, 4 pairs of aortic arches

  • have a mesonephritic kidney

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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

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Class Actinopterygiicharacteristics

  • Osmoregulation

    • in freshwater fishes

      • the fish is hyperosmotic and

      • therefore the kidney is used to get rid of excess water

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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.

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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.

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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

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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

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Catadromous migratione.g. freshwater eel

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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

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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