Lissamphibia
Common Frog (Rana temporaria )
Lissamphibia (plural, from Greek λισσός Lissus "smooth", αμφί amphi "on both sides " and βίος bios " life ", thus " smooth and alive in the water and on land " ) is the only extant subclass of amphibians or amphibians ( Amphibia ). All extant anurans ( Anura ), salamanders ( Caudata ), and caecilians ( Gymnophiona ) are regarded monophyletic as probable and included in this subclass - thus Lissamphibia is a synonym or a collective name for all of the approximately 6500 species of amphibians of the present (See in Articles amphibians and systematics of amphibians).
The designation of Lissamphibia done as opposed to fossil stem group representatives of primitive Tetrapoda as the Anthracosauria and Seymouriamorpha, as well as extinct as the Amphibientaxa Temnospondyli. All these extinct taxa lived from Devonian to the Cretaceous; for the Cenozoic ( Cenozoic ) are only representative of the Lissamphibia detectable.
System
The origin of the Lissamphibia continues to be debated and is controversial because of a long time gap in the fossil record. Currently, three hypotheses are represented: a monophyletic lineage of Lissamphibia either of the Temnospondyli or Lepospondyli, or a polyphyletischer origin, in which the frog and salamanders are descendants of Temnospondyli, but descended the caecilians of the Lepospondyli.
Combines a small, eleven inches long Temnospondylen, the characteristics of the frog and salamanders - - With the discovery of Gerobatrachus hottoni, the theory is supported, that at least the Batrachia descended ( frog and salamanders ) from the Temnospondylengruppe Dissorophoidea. Phylogenetic analyzes can currently suggest that the separation of frogs and newts then took place in the Middle Permian.
- Lissamphibia Caecilians ( Gymnophiona )
- Untitled monophyletic Albanerpetontidae †
- Batrachia Anura ( Anura )
- Salamanders ( Caudata / Urodela )