Lysorophia

Taxobox
name = Lysorophians
status = Fossil
fossil_range = Carboniferous to Permian
regnum = Animalia
phylum = Chordata
subphylum = Vertebrata
superclassis = Tetrapoda
classis = Amphibia
subclassis = Lepospondyli
ordo = Lysorophia
familia = Lysorophidae
subdivision_ranks = Genera
subdivision =
* ?"Brachydectes"
* ?"Megamolgophis"
* "Cocytinus"
* "Lysorophus"
* "Molgophis"

Lysorophia are an order of aquatic Carboniferous and Permian amphibians, which resembled small snakes.

The skull is lightly built and open, with large orbits and fenestrae. The intertemporal, supratemporal, postfrontal, and jugal bomes of the skull have disappeared. The mandibles are short, and the maxilla and premaxilla freely movable.

The torso is very elongate, the limbs diminutive or absent, and the tail short. There are up to 99 pre-sacral (i.e. not including the hips and tail) vertebrae.

Based on morphology of the cranio-vertebral articulation, Lysorophids are usually related to the Microsauria, although the pattern of bones of the skull is very different.

There is a single family, the Lysorophidae. The group is known mainly from the Late Pennsylvanian and Early Permian of North America.

References

* Carroll, RL (1988), "Vertebrate Paleontology and Evolution", WH Freeman & Co. p.180
* Wellstead, C.F. (1991), Taxonomic revision of the Lysorophia, Permo-Carboniferous lepospondyl amphibians. "Bull. Am. Mus. Nat. Hist." 209:1–90
* von Zittel, K.A (1932), "Textbook of Paleontology", C.R. Eastman (transl. and ed), 2nd edition, vol.2, p.225-6, Macmillan & Co.

External links

* [http://www.palaeos.com/Vertebrates/Units/Unit170/170.100.html#Lysorophia Lysorophia - Palaeos]
* [http://www.fmnh.helsinki.fi/users/haaramo/Metazoa/Deuterostoma/Chordata/Amphibia/Lepospondyli/Lysorophia.html Lysorophia - phylogeny]