introduction to chordates for msc zoology
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Phylum ChordataPhylum Chordata
The chordatesThe chordates
By:-nafees hussain{mlsu.udaipur}By:-nafees hussain{mlsu.udaipur}
Five Chordate HallmarksFive Chordate Hallmarks
Notochord – flexible rodlike structure; Notochord – flexible rodlike structure; extending length of bodyextending length of body
Five Chordate HallmarksFive Chordate Hallmarks
Dorsal tubular nerve cordDorsal tubular nerve cord
Five Chordate HallmarksFive Chordate Hallmarks
Pharyngeal pouches and gill slitsPharyngeal pouches and gill slits
Five Chordate HallmarksFive Chordate Hallmarks
Endostyle or thyroid gland – secretes mucous Endostyle or thyroid gland – secretes mucous that traps food particles in pharyngeal cavitythat traps food particles in pharyngeal cavity
Five Chordate HallmarksFive Chordate Hallmarks
Postanal tail – tail extends beyond anusPostanal tail – tail extends beyond anus
Sixth Chordate FeatureSixth Chordate Feature
Ventral Heart – heart located ventrally Ventral Heart – heart located ventrally
Higher Classification of ChordataHigher Classification of Chordata
Phylum ChordataPhylum Chordata
Subphylum Urochordata – tunicates, sea Subphylum Urochordata – tunicates, sea squirtssquirts
SubphylumSubphylum Cephalachordata – lanceletsCephalachordata – lancelets
Subphlum Vertebrata- vertebratesSubphlum Vertebrata- vertebrates
Subphylum UrochordataSubphylum Urochordata
Sea Squirts or TunicatesSea Squirts or Tunicates
Urochordate CharacteristicsUrochordate Characteristics
Have a non-living tunicHave a non-living tunic Most chordate features found in the free Most chordate features found in the free
living acidian larvaliving acidian larva Adults sessile filter feedersAdults sessile filter feeders
Acidean Larva and MetamorphosisAcidean Larva and Metamorphosis
Adult UrochordateAdult Urochordate
Subphylum Subphylum CephalochordataCephalochordata
LanceletsLancelets
Cephalochordate CharacteristicsCephalochordate Characteristics
Notochord and nerve cord found along entire length of body, persists throughout life
Fish-like in form
Includes the lancelets (amphioxus)
AmphioxusAmphioxus
Subphylum VertebrataSubphylum Vertebrata
The VertebratesThe Vertebrates
Vertebrate CharacteristicsVertebrate Characteristics
Bony or cartilaginous vertebrae surrounding spinal cord
Notochord only in embryonic stages, persisting in some fishes
Two superclasses according to presence of jaws
Vertebrate Higher ClassificationVertebrate Higher Classification Superclass Agnatha - without jawsSuperclass Agnatha - without jaws
Class Myxini – hagfishesClass Myxini – hagfishes Class Cephalaspidomorphi – lampreysClass Cephalaspidomorphi – lampreys
Superclass Gnathostomata – with jawsSuperclass Gnathostomata – with jaws Class Chondrichthyes – sharks, rays, chimaerasClass Chondrichthyes – sharks, rays, chimaeras Class Actinopterygii – ray-finned fishesClass Actinopterygii – ray-finned fishes Class Sarcopterygii – lobe-fin fishesClass Sarcopterygii – lobe-fin fishes Class Amphibia – frogs, salamandersClass Amphibia – frogs, salamanders Class Reptilia – snakes, lizards, crocodilesClass Reptilia – snakes, lizards, crocodiles Class Aves - birdsClass Aves - birds Class Mammalia - mammalsClass Mammalia - mammals
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