Post on 21-Jun-2015
Phylum Chordata
CharacteristicsHollow nerve chordNotochord Gill slits/Pharyngeal pouchesDigestive tubePost anal tail
Group of VertebratesFishesAmphibiansReptilesBirdsMammal
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.
Classes of FishClass Agnathostomata (Lampreys and Hagfishes)Class Chondrichthyes (Shark, Rays, and Skates)Class Osteichthyes (Tuna, Carp, Salmons, Stugeons)
Class Agnathostomata
CharacteristicsoAbsence of jawsoLack paired fins (Pelvic and pectoral)oSkeleton made of cartilageoRound eel-like body with a compressed caudal fin
Characteristics oSoft skin devoid of scalesoLack swim bladders and gill covers (Operculum)oTwo chambered heartoLateral linesoNo external ears and eyelids instead OtolithsoExternal FertilizationoOviparous
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/
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.”
CharacteristicsoSkeleton made of cartilageoBody covered with triangular placoid scalesoVentral subterminal mouth with several rows of triangular teeth.
CharacteristicsoInternal fertilizationoOvoviviparousoTwo chambered heartoNo external ears and eyelids
Class Osteichthyes
Yellow Fin Tuna
White Sturgeon
Carp
Salmon
CharacteristicsoSkeleton made of bonesoLateral linesoTwo chambered heartoOperculum covering the gillsoSwim bladder
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