BIOL 2030 Lecture Notes - Lecture 14: Keratin, Marsupial, Eusthenopteron
Document Summary
Amphibia vertebrate class including the extant subclass lissamphibia, comprising the frogs and toads (order anura), newts and salamanders (order urodela) and the worm-like caecilians (order apoda). There are also a number of extinct subclasses dating from the. Devonian onwards, of which the ichthyostegalians are the earliest amphibian fossils found. Amphibians are ectothermic anamniote tetrapod vertebrates that typically return to the water for reproduction and pass through an aquatic larval stage with gills. Adults generally have lungs, are carnivorous, and may be at least partly land- living,a nd modern amphibians have a moist skin without scales, which is permeable to water and gasses. Anura one of the three orders of extant amphibians, comprising the frogs and toads. Buccal pumping using lungs with a positive-pressure breathing (push air in) Caudata =urodela; one of the three orders of extant amphibians, containing the newts and salamanders, amphibians with well-developed tails and two pairs of more-or-less equal legs.
