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Temporal range: Carnian - Early Norian
(Possible Middle Triassic origin)
Hyperodapedon BW2.jpg
life restoration of Hyperodapedon
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Order: Rhynchosauria
Family: Hyperodapedontidae
Subfamily: Hyperodapedontinae
Chatterjee, 1969

Hyperodapedontinae is a subfamily of rhynchosaurs within the family Hyperodapedontidae. Fossils have been found from Argentina, Brasil, Canada, India, Madagascar, Scotland, Tanzania, USA and Zimbabwe.[1][2]


Hyperodapedontinae was erected by Sankar Chatterjee in 1969 as a coordinate name of the family Hyperodapedontidae Lydekker, 1985. Chatterjee (1969) originally named Hyperodapedontinae to include all Late Triassic rhynchosaurs known at that time, H. gordoni, H. huxleyi and "Scaphonyx" fischeri, and proposed a morphological diagnosis for the clade.[3][4] Scaphonyx includes two additional species, S. africanus and S. australis, all of which are currently believed to be dubious. As noted by Langer et al. (2000), using Chatterjee' morphological definition would exclude Teyumbaita and H. huenei from the clade, and thus it would be nested within Hyperodapedon. To preserve the name, with its original stratigraphical meaning, Langer et al. (2000) redefined Hyperodapedontinae as a stem-based taxon that includes "all rhynchosaurs closer to Hyperodapedon than to "Rhynchosaurus" spenceri (now Fodonyx)". The cladogram below follows Langer et al. (2000) and Langer et al. (2010):[4][5]


Isalorhynchus Cartography of Africa.svg

?Supradapedon Cartography of Africa.svg

Teyumbaita Cartography of South America.svg


H. huenei Cartography of South America.svg

H. mariensis Cartography of South America.svg

H. sanjuanensis Cartography of South America.svg

H. gordoni Cartography of Europe.svg

H. huxleyi Cartography of Asia.svg

    Valid species that were first assigned to Scaphonyx.

The cladogram below is based on Hone and Benton (2008). Hone & Benton (2008) applied all clade names within the Rhynchosauria to nodes in their topology incorrectly with respect to the definitions proposed by Langer et al. (2000) and Langer et al. (2010). As Hone & Benton (2008) didn't propose alternative definitions, the cladogram below follows Langer et al. (2000) definitions.[2]


Mesosuchus browni

Howesia browni

Stenaulorhynchus stockleyi


Rhynchosaurus articeps

Rhynchosaurus brodiei


Fodonyx spenceri


Ammorhynchus navajoi

Mariante rhynchosaur

Teyumbaita sulcognathus

Hyperodapedon huenei

Hyperodapedon huxleyi

Hyperodapedon gordoni

Hyperodapedon mariensis

Hyperodapedon sanjuanensis


  1. ^ Felipe Chinaglia Montefeltro (2008). "Inter-relações filogenéticas dos rincossauros (Diapsida, Archosauromorpha)". Unpublished Thesis, Biology Department, Universidade de Sa˜o Paulo, Ribeira˜o Preto: 203 pp. 
  2. ^ a b David W. E. Hone and Michael J. Benton (2008). "A new genus of Rhynchosaur from the Middle Triassic of South-West England". Palaeontology 51 (1): 95–115. doi:10.1111/j.1475-4983.2007.00739.x. 
  3. ^ Chatterjee, Sankar (1969). "Rhyncosaurs in time and Space". Proceedings of the Geological Society of London 1658: 203–208. 
  4. ^ a b Max C. Langer and Cesar L. Schultz (2000). "A new species of the Late Triassic rhynchosaur Hyperodapedon from the Santa Maria Formation of south Brazil". Palaeontology 43 (6): 633–652. doi:10.1111/1475-4983.00143. 
  5. ^ Max C. Langer, Felipe C. Montefeltro, David E. Hone, Robin Whatley and Cesar L. Schultz (2010). "On Fodonyx spenceri and a new rhynchosaur from the Middle Triassic of Devon". Journal of Vertebrate Paleontology 30 (6): 1884–1888. doi:10.1080/02724634.2010.521901.