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Temporal range: Permian
Lysorophus tricarinatus showing speculative egg-coiling behavior
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Lysorophia
Family: Lysorophidae
Genus: Lysorophus
Cope, 1877

Lysorophus alfredi
Lysorophus dunkardensis
Lysorophus minutus
Lysorophus tricarinatus

Lysorophus is a genus of Lysorophia, extinct Permian Lepospondyl tetrapods.[1] Most of the specimens are found from North America and attributed to the first formally described species Lysorophus tricarinatus due to the lack of diagnostic characters, but several other species have been described.[2] Lysorophus were small salamander-like amphibians.[3][4] They lived in fresh water, aestivating in burrows during dry periods.[5][6]


Lyrosophus sp. skull and vertebrae.
  1. ^ The Paleobiology Database
  2. ^ Wellstead, C.F., Taxonomic revision of the Lysorophia, Permo-Carboniferous lepospondyl amphibians. Bull. Am. Mus. Nat. Hist. 209:1–90 (1991)
  3. ^ S.W. Williston, Lysorophus, a Permian Urodele, Biological Bulletin 15 (1908), pp. 229–240
  4. ^ Sollas, W.J.On the Structure of Lysorophus, as Exposed by Serial Sections. Philosophical Transactions of the Royal Society of London. Series B, Vol 209, pp. 481-527
  5. ^ Olson, E.C. A Skeleton of Lysorophus tricarinatus (Amphibia: Lepospondyli) from the Hennessey Formation (Permian) of Oklahoma. Journal of Paleontology, vol.45, 3 (1971)
  6. ^ Hembree, D.I. et al., Amphibian burrows and ephemeral ponds of the Lower Permian Speiser Shale, Kansas: evidence for seasonality in the midcontinentPalaeogeography, Palaeoclimatology, Palaeoecology 203 (2004) p.127-152