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Osteicthyes

Osteicthyes. Ferran Pueyo 9B. Introduction to Osteicthyes. Taxonomic group of fish with bony skeletons instead of cartiligious Chordata i) Pisces 1) Chondricthyes / agnatha 2) Osteicthyes Over 29,000 species ( most of fishes)

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Osteicthyes

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  1. Osteicthyes FerranPueyo9B

  2. IntroductiontoOsteicthyes Taxonomic group of fish with bony skeletons instead of cartiligious Chordata i)Pisces 1)Chondricthyes/agnatha 2) Osteicthyes Over 29,000 species ( most of fishes) Dividedintotwolargegroupswhich are theray-finned fish (majority) and thelobe-finnedfish Oldestknownfossil 420 millionyears Uniquetoothpatternbetweentherows of teeth, found in fossils Name comes fromthelatinwordosteowhichmeansbone

  3. DifferenceBetweenOsteicthyes and Chondricthyes Osteicthyesmeansosseusorbonyfish, Chondricthyesmeanscartilagenous Difference in scales and covering of body Chondricthyes has no air bladderorlungs Difference in gillnumber

  4. Characteristics Skeleton Cranialbones Rootedteeth Eyeballheldbyfoursmallbones (some fish havelostorchangedthischaracteristic) Braincasedividedinto anterior and posterior sections Do nothave fin spines instead havebone fin rays (lepidotrichia) Specificcharacteristicthatallowsthemtobreathwithoutswimming (operculum) Fin limbs, relatedtotretapods

  5. Characteristics(2) Endochondralbone Known as replacementbone Boneossifiedinternally Cartilageinsidetheboneiscalcified and replaced with osteoplasts Final result, bonenowsurroundsotherbone Veryspecialbecausebonestarts as cartilagebutthencalcifies Liightweight, flexible interior, surroundedbydenserbone

  6. RespiratorySystem Breathe through gills located on either side of the pharynx Threadlikestructurescalledfilaments Capillary network which creates space for exchangingoxygen andcarbon dioxide Exhale through a single opening, the gill slits, protected by a gill cover ( to keep out water from entering the lungs)

  7. CirculatorySystem Two muscular chambers that pump the blood, atrium and ventricle.  Atrium pumps blood into the ventricle Bulbusarteriosus Blood is pumped into capillary network , where the exchange of gas takes place (from aorta) Gathers in a thin-walled sac, sinus venosus Returns to the atrium

  8. SensorySystem Highlydevelopedsenseorgans, vital for fish Color vision, at leastbetterthanhumans Chemoreceptors that are responsible for superior senses of taste and smell Catfish, have organs that detect weak electric currents (example) Fish eyes are similar to those of terrestrial vertebrates like  mammals, but have a more spherical lens Fish have pain and fear responses Nervous system poorly developed

  9. DigestiveSystem Esophagus is short and flexible , large amounts can be swallowed (layered with muscle) Stomach muscular tube in a ‘u’ or ‘v’ shape. Gastric glands, break down food The pyloric caeca is an adaptation for increasing the gut area; they digest food. Pancreas  Food absorption takes place in the intestine. Plant-eating bony fishes generally have long intestines. Carnivorous bony fishes have shorter intestines

  10. LifeCycle/ Expectancy Birth ; hatchedfromeggs (incubation) Reproduction ; 1. SEXUAL MATURITY 2.REPRODUCTIVE BEHAVIOR 3. PARENTAL CARE Death; Lifeexpectancyvariesgreatly, usuallycold-waterlivelongerthanwarm. Oldestknownosteicthyesistheorangeroughythat can live up to 100 years

  11. Diet Impossibletogeneralize Maybecarnovour, omnivourorherbivore Commondiet: annelidworms marine snails mussels clams squids insects birds amphibians, smallmammals and otherfishes.

  12. MostKnownSpecies Sturgeons Gars Eels Carp Herrings Anchovies Catfish Goldfishes Piranhas Seahorses Bass Cichlids Pickerel Salmon Trout Oarfish

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