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The Chordate Animals

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The Chordate Animals Neotony Evolutionary process in which adolescent characteristics are selected for (adults against) such that species become young looking while ... – PowerPoint PPT presentation

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Title: The Chordate Animals


1
The Chordate Animals
2
Neotony
  • Evolutionary process in which adolescent
    characteristics are selected for (adults against)
    such that species become young looking while
    maintaining the adult ability to reproduce

3
Chordate Characteristics
  • Notocord
  • Dorsal Nerve Cord
  • Pharyngeal Slits
  • Postanal Tail

4
Notocord
  • Rodlike semi-rigid body of cells enclosed by a
    fibrous sheath and filled with fluid
  • Functions to support and stiffen the body for
    movement

5
Dorsal Nerve Cord
  • Dorsal to the Notocord this structure may develop
    an anterior brain
  • Functions to integrate sensory stimuli and to
    control muscular response

6
Pharyngeal Slits
  • Filter feeding anatomy in ancestral chordates
    that becomes associated with gills in later
    aquatic forms.

7
Other Chordate Characteristics
  • Mainly Bilateral and Cephalized
  • Deuterostome
  • Coelomate
  • Segmented
  • Endoskeleton

8
Chordate Classification
  • Subphylum Urochordata (Tunicates)
  • Subphylum Cephalochordata (Lancelets)
  • Subphylum Vertebrata (Vertebrates)

9
Urochordates (Tunicates)
  • Marine and mainly non-mobile filter feeding
    organisms (sponge-like)
  • Contains chordate characteristics during the
    larval stage of its life cycle

10
Cephalochordates (Lancelets)
  • Marine mobile filter feeding organism (fish-like)
  • Contains chordate characteristics during its
    adult stage

11
Vertebrates
  • Common Chordate Animals
  • Backbone replaces Notocord
  • Pharyngeal Bones evolve into Jaws
  • Lungs and Four Appendages (Tetrapods) Evolve

12
Diverse Fishes
  • 1) Jawless Fish (Class Agnatha)
  • 2) Cartilaginous Fish (Chondrichthyes)
  • 3) Bony Fish (Osteichthyes)
  • Characterized by scales, predatory lifestyle, and
    a swimbladder

13
Amphibians (Class Amphibia)
  • Vertebrates characterized by smooth moist skin,
    an amphibious lifestyle and metamorphosis
  • Gilled larvae that are highly aquatic
  • Adults having lungs that are more terrestrial
  • Salamanders, Frogs, and Toads

14
Reptiles (Class Reptilia)
  • Vertebrates characterized by scales, internal
    fertilization, and an amniotic egg
  • Turtles, Crocodiles, Snakes, and Lizards

15
Birds (Class Aves)
  • Vertebrates characterized by feathers, flight,
    warm-bloodedness, and parental care

16
Mammals (Class Mammalia)
  • Vertebrates characterized by hair, various skin
    glands including the mammary gland, internal
    placental development, and heterodont teeth
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