Class Amphibia The Tetrapods Moving Ashore Transitional Forms

Class Amphibia The Tetrapods Moving Ashore Transitional Forms

Class Amphibia The Tetrapods Moving Ashore

Transitional Forms Early Land Tetrapods Evolutionary Lung Forms

Changes in Lung Anatomy In Tetrapods Amphibian Respiration Changes in Vertebrate Circulatory Systems

Amphibian Heart Anatomy General Amphibian Traits

Tetrapods 3-5 digits on forelimb (most 4)

5 digits on hind limb No dermal scales Glandular epidermis Most with indirect development, some with tadpole larvae Gills as larvae/juveniles, lungs present but may

degenerate, some with dermal respiration Order Gymnophiona

~160 species

Legless Burrowing or aquatic Tropical Internal fertilization Oviparous & viviparous species Direct development in most

Order Gymnophiona (Apoda) Caecilians Order Caudata (Urodela) AKA Salamanders

Have a tail Divergence in respiratory mechanisms Paedomorphosis prevalent Internal fertilization

Salamander/Newt Lifecycle Some Urodeles Giant Japanese Salamander

Necturus maculosus Southern dusky salamander Ambystoma mexicanum (Axolotl)

Order Anura

Frogs & Toads No tail External fertilization Indirect development in most

Frog or Toad? Frogs Associated with more aquatic habitats

Toads Thicker skins Dryer habitats Her Royal Highness

Xenopus laevis Developmental model system Typical Anuran Lifecycle Really Weird Surinam

Toad Local Species Acris crepitans

Rana catesbeiana Bufo speciosus Bufo woodhousii

Rana pipiens Pseudacris clarki

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