Phylum Chordata: Fishes
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Transcript of Phylum Chordata: Fishes
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Phylum Chordata
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CharacteristicsHollow nerve chordNotochord Gill slits/Pharyngeal pouchesDigestive tubePost anal tail
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Group of VertebratesFishesAmphibiansReptilesBirdsMammal
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FishesWater 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.
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Classes of FishClass Agnathostomata (Lampreys and Hagfishes)Class Chondrichthyes (Shark, Rays, and Skates)Class Osteichthyes (Tuna, Carp, Salmons, Stugeons)
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Class Agnathostomata
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CharacteristicsoAbsence of jawsoLack paired fins (Pelvic and pectoral)oSkeleton made of cartilageoRound eel-like body with a compressed caudal fin
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Characteristics oSoft skin devoid of scalesoLack swim bladders and gill covers (Operculum)oTwo chambered heartoLateral linesoNo external ears and eyelids instead OtolithsoExternal FertilizationoOviparous
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Class Chondrichthyes
Carcharadon carcharias
•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/
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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.”
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CharacteristicsoSkeleton made of cartilageoBody covered with triangular placoid scalesoVentral subterminal mouth with several rows of triangular teeth.
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CharacteristicsoInternal fertilizationoOvoviviparousoTwo chambered heartoNo external ears and eyelids
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Class Osteichthyes
Yellow Fin Tuna
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White Sturgeon
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Carp
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Salmon
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CharacteristicsoSkeleton made of bonesoLateral linesoTwo chambered heartoOperculum covering the gillsoSwim bladder
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CharacteristicsoPaired fins made of rays and spines or lobed fins lacking the rays and spines.oVarious types of scales (ctenoid, ganoid, cycloid)oExternal fertilizationoSpawning and oviparousoNo external ears and eyelids
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