# Rastosuchus

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Extinct genus of temnospondyls

Rastosuchus Temporal range: Guadalupian–Lopingian PreꞒ Ꞓ O S D C P T J K Pg N Scientific classification Kingdom: Animalia Phylum: Chordata Clade: Tetrapoda Order: †Temnospondyli Suborder: †Stereospondyli Family: †Rhinesuchidae Genus: †Rastosuchus Dias et al., 2020 Species: †R. hammeri Binomial name †Rastosuchus hammeri Dias et al., 2020

***Rastosuchus*** is an extinct genus of [stereospondyl](/source/Stereospondyl) [temnospondyl](/source/Temnospondyl) within the family [Rhinesuchidae](/source/Rhinesuchidae). It contains one species, ***Rastosuchus hammeri***, found in the [Permian](/source/Permian) [Rio do Rasto Formation](/source/Rio_do_Rasto_Formation) of [Brazil](/source/Brazil).

## History of study

The name *Rastosuchus hammeri* was used as early as 1980 and then on several other instances,[1][2][3] but because none of these usages formalized the name via a formal description, the name was considered to be a *[nomen nudum](/source/Nomen_nudum)* until formally described by Dias et al. (2020).[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*] Some of the material was also previously mentioned without nomenclatural assignment.[4][5] A partial description of a nearly complete skull now assigned to this taxon was presented by Barberena & Dias (1998),[6] and the phylogenetic position (as the "Serra do Cadeado short-snouted rhinesuchid") was assessed by Eltink et al. (2016).[7] The holotype is a pair of lower jaws because this was the first material informally associated with the name. The genus name refers to the Rio do Rasto Formation, with the common suffix -*suchus* for 'crocodile.' The species name honors William R. Hammer, who is best known for his work on [Gondwanan](/source/Gondwana) fossil tetrapods.

## Anatomy

In addition to the holotype and previously described complete skull, additional material includes fragmentary lower jaws and one partial postcranial skeleton including the pectoral girdle, hindlimb, vertebrae, and ribs. Specimens were collected from several localities and over a number of years. Based on the holotype, *R. hammeri* is diagnosed by many features, such as the presence of large teeth on all three coronoid bones, rather than denticles as in other rhinesuchids; a short symphysis; and various contacts between different mandibular bones.

## Phylogenetic position

Below is the topology recovered by Eltink et al. (2016):[7]

Temnospondyli Dendrerpeton Eryops Trimerorhachis Stereospondylomorpha Konzhukovia Tryphosuchus Stereospondyli Lapillopsis Peltobatrachus Lydekkerina Mastodonsaurus Benthosuchus Rhinesuchidae Rhinesuchinae Rhineceps Rhinesuchus Uranocentrodon Australerpetinae Broomistega Australerpeton Rastosuchus (Serra do Cadeado short-snouted) Laccosaurus BP-1-4473 "Rhinesuchus" capensis Rhinesuchoides

## References

1. **[^](#cite_ref-1)** Barberena, Mario C.; Dos Reis Correia, Norberto; Aumond, Juarez J. (1980). ["Contribuição à estratigrafia e bioestratigrafia do Grupo Passa Dois na Serra do Cadeado (Nordeste do Paraná, Brasil)"](https://ppegeo.igc.usp.br/index.php/rbg/article/view/12352). *Revista Brasileira de Geociências*. **10** (4): 268–275. [doi](/source/Doi_(identifier)):[10.25249/0375-7536.1980268275](https://doi.org/10.25249%2F0375-7536.1980268275) (inactive 1 July 2025).{{[cite journal](https://en.wikipedia.org/wiki/Template:Cite_journal)}}: CS1 maint: DOI inactive as of July 2025 ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_DOI_inactive_as_of_July_2025))

1. **[^](#cite_ref-2)** ["The Gai-As Lake System, Northern Namibia and Brazil"](http://pubs.geoscienceworld.org/books/book/1304/chapter/107165512/The-GaiAs-Lake-System-Northern-Namibia-and-Brazil), *Lake Basins Through Space and Time*, American Association of Petroleum Geologists, pp. 87–108, 2000, [doi](/source/Doi_(identifier)):[10.1306/st46706c6](https://doi.org/10.1306%2Fst46706c6), [ISBN](/source/ISBN_(identifier)) [978-0-89181-052-0](https://en.wikipedia.org/wiki/Special:BookSources/978-0-89181-052-0), retrieved 2022-03-13{{[citation](https://en.wikipedia.org/wiki/Template:Citation)}}: CS1 maint: work parameter with ISBN ([link](https://en.wikipedia.org/wiki/Category:CS1_maint:_work_parameter_with_ISBN))

1. **[^](#cite_ref-3)** Eltink, Estevan; Dias, Eliseu V. (2012). Gallo, V.; Silva, H.M.A.; Brito, P.M.; Figueiredo, F.J. (eds.). *Temnospôndilos do Brasil: uma breve revisão e aspectos paleobiogeográficos*. Editora Interciência. pp. 69–89. {{[cite book](https://en.wikipedia.org/wiki/Template:Cite_book)}}: |work= ignored ([help](https://en.wikipedia.org/wiki/Help:CS1_errors#periodical_ignored))

1. **[^](#cite_ref-4)** Dias, Eliseu V.; Kroeff, T. (2002). *The lower jaw of the short-snouted amphibian from the Rio do Rasto Formation (Upper Permian) Brazil*. Porto Alegre: Sociedade Brasileira de Paleontologia. p. 40.

1. **[^](#cite_ref-5)** Souza, Adriana S.; Vega, Cristina S. (2011). "Short-snouted skull, mandible, axial and apendicular skeleton materials of Temnospondyli amphibians (Rio do Rasto Formation, Paraná Basin, Brazil)". *Ameghiniana*. **48**: R212.

1. **[^](#cite_ref-6)** Barberena, Mario C.; Dias, Eliseu V. (1998). "On the presence of a short- snouted rhinesuchoid amphibian in the Rio do Rasto Formation (Late Permian of Paraná Basin, Brazil)". *Anais da Academia Brasileira de Ciências*. **70**: 465–468.

1. ^ [***a***](#cite_ref-:1_7-0) [***b***](#cite_ref-:1_7-1) Eltink, Estevan; Dias, Eliseu V.; Dias-da-Silva, Sérgio; Schultz, Cesar L.; Langer, Max C. (2015-10-15). ["The cranial morphology of the temnospondylAustralerpeton cosgriffi(Tetrapoda: Stereospondyli) from the Middle-Late Permian of Paraná Basin and the phylogenetic relationships of Rhinesuchidae"](https://doi.org/10.1111%2Fzoj.12339). *Zoological Journal of the Linnean Society*. **176** (4): 835–860. [doi](/source/Doi_(identifier)):[10.1111/zoj.12339](https://doi.org/10.1111%2Fzoj.12339). [ISSN](/source/ISSN_(identifier)) [0024-4082](https://search.worldcat.org/issn/0024-4082).

v t e Stereospondyli Kingdom: Animalia Phylum: Chordata Clade: Tetrapodomorpha Order: Temnospondyli Tetrapodomorpha see Tetrapodomorpha Temnospondyli see Temnospondyli Stereospondyli see below↓ Stereospondyli Stereospondyli Arachana Capulomala Peltobatrachus Lapillopsidae Lapillopsis Manubrantlia Rhigerpeton Rotaurisaurus Rhinesuchidae Australerpeton? Broomistega Laccosaurus Parapytanga? Rastosuchus Rhineceps Rhinesuchoides Rhinesuchus Uranocentrodon Lydekkerinidae Chomatobatrachus Cryobatrachus Deltacephalus Eolydekkerina Indobenthosuchus Luzocephalus? Lydekkerina Capitosauria Antarctosuchus Bukobaja Calmasuchus Capitosaurus Cherninia Cyclotosaurus Edingerella Eocyclotosaurus Eryosuchus Heptasaurus Huangfuchuansuchus Jammerbergia Kestrosaurus Kupferzellia Mastodonsaurus Meyerosuchus Odenwaldia Paracyclotosaurus Parotosuchus Quasicyclotosaurus Procyclotosaurus Promastodonsaurus Rhadalognathus Samarabatrachus Sassenisaurus Sclerothorax Selenocara Stanocephalosaurus Stenotosaurus Subcyclotosaurus Tatrasuchus Vladlenosaurus Volgasaurus Volgasuchus Warrenisuchus Watsonisuchus Wellesaurus Wetlugasaurus Xenotosuchus Yuanansuchus Trematosauria see below↓ Trematosauria Trematosauria Almasaurus Bothriceps Callistomordax Chinlestegophis Keratobrachyops Laidleria Latiscopus Qantas Rileymillerus Syrtosuchus Uruyiella Benthosuchidae Benthosuchus Kwatisuchus Trematosauridae Angusaurus Aphaneramma Cosgriffius Erythrobatrachus Gonioglyptus Hyperokynodon Icanosaurus Indolyrocephalus Inflectosaurus Lyrocephaliscus Microposaurus Panchetosaurus Platystega Prothoosuchus Stoschiosaurus Tertrema Tertremoides Thoosuchus Tirraturhinus Trematolestes Trematosuchoides Trematosaurus Trematosuchus Trematotegmen Wantzosaurus Metoposauridae Anaschisma Apachesaurus Arganasaurus Buettnererpeton Dutuitosaurus Metoposaurus Panthasaurus Rhytidosteidae Boreopelta Mahavisaurus Nanolania Peltostega Pneumatostega Rhytidosteus Sangaia Trucheosaurus Derwentiinae Arcadia Acerastia Deltasaurus Derwentia Indobrachyops Rewana Chigutisauridae Arenaerpeton Chigutisaurus Compsocerops Koolasuchus Pelorocephalus Siderops Brachyopidae Banksiops Bathignathus Batrachosaurus Batrachosuchoides Batrachosuchus Blinasaurus Brachyops Gobiops Hadrokkosaurus Notobrachyops Platycepsion Sinobrachyops Vanastega Vigilius Xenobrachyops Plagiosauridae Gerrothorax Megalophthalma Plagiobatrachus Plagiorophus Plagiosaurus Plagioscutum Plagiosternum Plagiosuchus See also: Trematosauroidea Metoposauroidea Rhytidosteoidea Brachyopomorpha Brachyopoidea Plagiosauroidea Category

Taxon identifiers Rastosuchus Wikidata: Q97482143 GBIF: 11186794 Paleobiology Database: 433421

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Adapted from the Wikipedia article [Rastosuchus](https://en.wikipedia.org/wiki/Rastosuchus) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Rastosuchus?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.