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Chordates

Chordates. By: Jessica Taylor, Nicolas Armao , Nikki Cave, & Casey C oncannon. Characteristics:. United by having a notochord Has a hollow dorsal nerve cord They have pharyngeal slits Have a endostyle Has a post-anal tail. Body Systems.

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Chordates

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  1. Chordates By: Jessica Taylor, Nicolas Armao, Nikki Cave, & Casey Concannon

  2. Characteristics: • United by having a notochord • Has a hollow dorsal nerve cord • They have pharyngeal slits • Have a endostyle • Has a post-anal tail

  3. Body Systems • Nervous system- have hallow nerve cord. The nerve cord branches off to connect to organs and muscles • Respiratory system-take in oxygen and release CO2 through gills or lungs • Skeleton-have vertebral column, have endoskeleton • Digestion- food goes in through a mouth with a tongue. The food goes into the stomach and then through intestines • Excretion- kidneys filter waste from the body

  4. Class Chondrichthyes: • Jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone • Divided into 2 subclasses: Elasmobranchii and Holocephali • brain weight relative to body size • are mostly ectothermic

  5. Class Reptilia: • Air breathing, cold-blooded vertebrates • Skin is covered in scales • Tetrapods • First animals to develop amniotic egg • In every continent but Antarctica • Subclasses (orders): crocodilia, sphenodonia, squamata, and testudines • Most have 3 chambered hearts except crocidiles and alligators

  6. Class Amphibia: • Examples: frogs, toads, salamanders, newts, and gymnophiona • have included all tetrapods (4 limbs) that are not amniotes • Divided into 3 subclasses: labyrinthodontia, Lepospondyli, & Lissamphibia. • Three-chambered heart with two atria and one ventricle

  7. Class mammalia: • Characterized by sweat glands • Give birth instead of egg laying • 5,400 species • Subclasses (orders): rodentia, chiroptera, carnivora, cetartiodaotyla, and primate • First mammals appeared in Jurassic period • Have double occipital condyle

  8. Class cyclastomata: • Jawless fish • Only one pair of appendages present • Have long slender bodies without scales and fins • Have rows of teeth that move in a circular motion • Mouths can’t close due to lack of jaw

  9. Aves • Birds • Have strong beaks, no teeth, muscular stomach, feathers • Lay hard-shelled eggs with large yolk • Hallow bones • Maintain body temperature

  10. Osteichthyes • Also called bony fish. • Have terminal mouth, a flap covering it’s gills, a swim bladder. • Jaw articulates with skull. Jaw contains teeth. • Have 2-chambered heart • Two classes- Actinopteygii and Sarcopterygii

  11. The end!

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