1 / 18

Superclass Osteichthyes bony fishes

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.

Solomon
Télécharger la présentation

Superclass Osteichthyes bony fishes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Superclass Osteichthyes bony fishes • Class Actinopterygii • Ray finned fishes • Class Sarcopterygii (lobe fin fishes) • Lung fishes • Coelocanth

  2. Class Actinopterygii

  3. Class Actinopterygiicharacteristics • bony dermal scales: ganoid, cycloid and ctenoid

  4. 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

  5. Class Actinopterygiicharacteristics • heart is 2 chambered, 4 pairs of aortic arches • have a mesonephritic kidney

  6. 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

  7. Class Actinopterygiicharacteristics • Osmoregulation • in freshwater fishes • the fish is hyperosmotic and • therefore the kidney is used to get rid of excess water

  8. 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.

  9. 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.

  10. 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

  11. 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

  12. Anadromous migratione.g. salmon

  13. Anadromous migratione.g. salmon

  14. Catadromous migratione.g. freshwater eel

  15. 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

  16. 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

More Related