Phylum Chordata – most diverse group Common Characteristics

Дата канвертавання17.04.2016
Памер8.04 Kb.
Phylum Chordata most diverse group

Common Characteristics – occur at some stage – larvae or adult

  1. Pharyngeal (near throat or pharynx) gill slits or pouches

  2. Hollow Dorsal Nerve cord

  3. Notochord – dorsal rod made of cartilage

  4. Post anal tail

  5. Digestive tube located behind the mouth

Other characteristics

3 Main Groups/Subphyla

1. Subphylum Urochordata – tunicates

2. Subphylum Cephalochordata – lancelets

  • Both of the above groups show chordate characteristics in early stages of development only.

3. Subphylum Vertebrata

  • Skull – enclosing the brain - and Backbone – bony segments or cartilage surrounding nerve cord

  • Both enclose a complex nervous system

  • Provides protection and flexibility

  • Support from endoskeleton

  • Complete and somewhat complex systems


Class Agnatha: Fish lacking jaws

Class Chondrichthyes: Cartilaginous fish

Class Osteichthyes: Bony fish

Class Amphibia: Amphibians, adapted to terrestrial and aquatic environments

Class Reptilia: Reptiles, descendants of amphibians adapted to living on land alone

Class Aves: The birds

Class Mammalia: The mammals, a diverse class with hair and mammary glands

База данных защищена авторским правом © 2016
звярнуцца да адміністрацыі

    Галоўная старонка