# Demandasaurus

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Extinct genus of dinosaurs

Demandasaurus Temporal range: Early Cretaceous, 125 Ma PreꞒ Ꞓ O S D C P T J K Pg N Skeletal reconstruction Scientific classification Kingdom: Animalia Phylum: Chordata Class: Reptilia Clade: Dinosauria Clade: Saurischia Clade: †Sauropodomorpha Clade: †Sauropoda Superfamily: †Diplodocoidea Family: †Rebbachisauridae Genus: †Demandasaurus Fernández-Baldor et al., 2011 Species: †D. darwini Binomial name †Demandasaurus darwini Fernández-Baldor et al., 2011

***Demandasaurus*** (meaning "[Demanda](/source/Sierra_de_la_Demanda) lizard") is a [genus](/source/Genus) of [rebbachisaurid](/source/Rebbachisauridae) [sauropod](/source/Sauropoda) [dinosaur](/source/Dinosaur) from early [Cretaceous](/source/Cretaceous) (late [Barremian](/source/Barremian) — early [Aptian](/source/Aptian) stage) deposits of [Spain](/source/Spain). *Demandasaurus* is known from an incomplete but associated [skeleton](/source/Skeleton) that includes [cranial](/source/Cranium) and [postcranial](/source/Postcrania) remains. It was collected from the [Castrillo de la Reina Formation](/source/Castrillo_de_la_Reina_Formation) in [Burgos Province](/source/Burgos_Province). It was first named by Fidel Torcida Fernández-Baldor, [José Ignacio Canudo](https://en.wikipedia.org/w/index.php?title=Jos%C3%A9_Ignacio_Canudo&action=edit&redlink=1), Pedro Huerta, Diego Montero, Xabier Pereda Suberbiola, and Leonardo Salgado in [2011](/source/2011_in_paleontology), and the [type species](/source/Type_species) is *Demandasaurus darwini*.[1]

## Description

[Life restoration](/source/Life_restoration)

It has a series of singular characteristics that allow this differentiation as a new genus and species.[1] For example, teeth with a special ornamentation of ridges in its enamel, cervical vertebrae with bone structures that are not present in other dinosaurs, neural arches of the dorsal vertebrae crossed entirely by two pneumatic fossae.[1] The rounded shape of its snout also contrasts with the most square contour snouts of the rest of the diplodocoids and especially its close relative *[Nigersaurus](/source/Nigersaurus).*[2][1]

## History and naming

Left dentary

*Demandasaurus* was first collected between 2002 and 2004 by the Archaeological−Palaeontological Group of Salas de los Infantes at Tenadas de los Vallejos II, a fossil locality north of [Salas de los Infantes](/source/Salas_de_los_Infantes) in [Burgos, Spain](/source/Burgos).[3][1] The strata at the site comes from the [Upper Barremian](/source/Barremian)-[Lower Aptian](/source/Aptian) of the [Castrillo de la Reina Formation](/source/Castrillo_de_la_Reina_Formation), and the *Demandasaurus* fossils were found alongside fossils of [spinosaurids](/source/Spinosauridae), small [ornithopods](/source/Ornithopoda), and a crocodilian.[1] About 810 fossils were collected at the site, most of them pertaining to the type skeleton of *Demandasaurus.*[1] The skeleton (MDS−RVII assorted) consists of: premaxillae, left dentary, six isolated teeth, 3 [cervical vertebrae](/source/Cervical_vertebrae), 5 cervical ribs, 2 [dorsals](/source/Thoracic_vertebrae), 9 dorsal ribs, 19 caudal vertebrae, 9 [haemal arches](/source/Haemal_arch) of chevrons, [ischia](/source/Pelvis), and [left femur](/source/Femur).[3][1] The skeleton was described as the holotype of a new taxon, *Demandasaurus darwini*, in 2011 by Fernández−Baldor and colleagues in the *[Acta Palaeontologica Polonica](/source/Acta_Palaeontologica_Polonica).*[1] The genus name comes from the Demanda mountain chain, which was where the type locality was located, and the specific name is after famous naturalist Charles Darwin. The taxon was later described in detail in the thesis of Torcida Fernández-Baldor in 2012.[3]

## Classification and evolution

*Demandasaurus* is the only rebbachisaurid described from Spain. *Demandasaurus* is also one of the few known European rebbachisaurids, being the first recognized, as the group was formerly known only in Africa and South America.[4][2][1] This taxon has a high paleobiogeographic interest due to its close kinship relationship with the African *Nigersaurus* it has been an argument contributed to develop the hypothesis of an African origin of *Demandasaurus*. Likewise, the appearance in Europe of *Demandasaurus*, is proof of the existence of a physical connection, an intercontinental bridge, between the two continents in that age, although it did not occur permanently.[1]

## References

1. ^ [***a***](#cite_ref-Demandasaurus_1-0) [***b***](#cite_ref-Demandasaurus_1-1) [***c***](#cite_ref-Demandasaurus_1-2) [***d***](#cite_ref-Demandasaurus_1-3) [***e***](#cite_ref-Demandasaurus_1-4) [***f***](#cite_ref-Demandasaurus_1-5) [***g***](#cite_ref-Demandasaurus_1-6) [***h***](#cite_ref-Demandasaurus_1-7) [***i***](#cite_ref-Demandasaurus_1-8) [***j***](#cite_ref-Demandasaurus_1-9) [***k***](#cite_ref-Demandasaurus_1-10) Fidel Torcida Fernández-Baldor; José Ignacio Canudo; Pedro Huerta; Diego Montero; Xabier Pereda Suberbiola; Leonardo Salgado (2011). ["*Demandasaurus darwini*, a new rebbachisaurid sauropod from the Early Cretaceous of the Iberian Peninsula"](http://www.app.pan.pl/archive/published/app56/app20100003.pdf) (PDF). *Acta Palaeontologica Polonica*. **56** (3): 535–552. [doi](/source/Doi_(identifier)):[10.4202/app.2010.0003](https://doi.org/10.4202%2Fapp.2010.0003).

1. ^ [***a***](#cite_ref-:0_2-0) [***b***](#cite_ref-:0_2-1) Sereno, Paul C.; Wilson, Jeffrey A.; Witmer, Lawrence M.; Whitlock, John A.; Maga, Abdoulaye; Ide, Oumarou; Rowe, Timothy A. (2007-11-21). ["Structural Extremes in a Cretaceous Dinosaur"](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2077925). *PLOS ONE*. **2** (11) e1230. [Bibcode](/source/Bibcode_(identifier)):[2007PLoSO...2.1230S](https://ui.adsabs.harvard.edu/abs/2007PLoSO...2.1230S). [doi](/source/Doi_(identifier)):[10.1371/journal.pone.0001230](https://doi.org/10.1371%2Fjournal.pone.0001230). [ISSN](/source/ISSN_(identifier)) [1932-6203](https://search.worldcat.org/issn/1932-6203). [PMC](/source/PMC_(identifier)) [2077925](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2077925). [PMID](/source/PMID_(identifier)) [18030355](https://pubmed.ncbi.nlm.nih.gov/18030355).

1. ^ [***a***](#cite_ref-:1_3-0) [***b***](#cite_ref-:1_3-1) [***c***](#cite_ref-:1_3-2) Fernández-Baldor, F. T. (2012). *Sistemática, filogenia y análisis paleobiogeográfico de demandasaurus darwini (sauropoda, rebbachisauridae) del Barremiense superior-Aptiense de Burgos: España* (Doctoral dissertation, Universidad de Zaragoza).

1. **[^](#cite_ref-4)** Torcida Fernández-Baldor, F., & Canudo, J. I. (2013). Rebbachisauridae: the European exception. *Libro de resúmenes Abstract book*, 31.

v t e Sauropodomorpha Kingdom: Animalia Phylum: Chordata Class: Sauropsida Clade: Avemetatarsalia Clade: Dinosauria Avemetatarsalia see Avemetatarsalia Sauropodomorpha see below↓ Sauropodomorpha Sauropodomorpha Ahvaytum? Buriolestes Eoraptor Gigantoscelus Guaibasaurus Mbiresaurus Pampadromaeus Panphagia Saturnaliidae Buriolestes? Eoraptor? Chromogisaurus Nhandumirim Pampadromaeus? Panphagia? Saturnalia Bagualosauria Arcusaurus Asylosaurus Bagualosaurus Efraasia Huayracursor Nambalia Pantydraco Thecodontosaurus Unaysauridae Jaklapallisaurus Macrocollum Unaysaurus Plateosauria Plateosauravus Ruehleia Xixiposaurus Plateosauridae Euskelosaurus Gresslyosaurus Issi Pachysauriscus Plateosaurus Yimenosaurus Massopoda Gryponyx Gyposaurus Ignavusaurus Kholumolumo Musankwa Sarahsaurus Tuebingosaurus Wudingloong Riojasauridae Eucnemesaurus Riojasaurus Massospondylidae Adeopapposaurus Coloradisaurus Glacialisaurus Ignavusaurus? Leyesaurus Lufengosaurus Massospondylus Ngwevu Pradhania Sarahsaurus Xingxiulong? Sauropodiformes Chuxiongosaurus? Jingshanosaurus Lishulong Qianlong Seitaad Xingxiulong? Yizhousaurus Yunnanosaurus Anchisauria Aardonyx Anchisaurus Camelotia Irisosaurus Lamplughsaura Leonerasaurus Melanorosaurus Meroktenos Mussaurus Pulanesaura Sefapanosaurus Sauropoda see below↓ Sauropoda Sauropoda Amygdalodon Blikanasaurus Chinshakiangosaurus Gongxianosaurus Isanosaurus Leonerasaurus? Pulanesaura? Protognathosaurus Schleitheimia Tuebingosaurus? Lessemsauridae Antetonitrus Ingentia Ledumahadi Lessemsaurus Gravisauria Archaeodontosaurus? Kotasaurus Ohmdenosaurus Rhoetosaurus Sanpasaurus? Zizhongosaurus? Vulcanodontidae Tazoudasaurus Vulcanodon Eusauropoda Algoasaurus Asiatosaurus Bagualia Barapasaurus Bellusaurus Cetiosauriscus Dashanpusaurus Dystrophaeus Huashanosaurus Janenschia Jinchuanloong Jobaria Nebulasaurus Perijasaurus Shunosaurus Spinophorosaurus Tehuelchesaurus Volkheimeria Yantaloong Cetiosauridae Cetiosaurus Chebsaurus Ferganasaurus? Lapparentosaurus? Patagosaurus? Mamenchisauridae Analong Anhuilong Cetiosauriscus? Chuanjiesaurus Datousaurus? Eomamenchisaurus Huangshanlong Hudiesaurus Jingiella Klamelisaurus? Mamenchisaurus Omeisaurus Qijianglong Rhomaleopakhus Tienshanosaurus Tonganosaurus Tongnanlong Wamweracaudia Xinjiangtitan Yuanmousaurus Zigongosaurus Turiasauria Amanzia Bellusaurus? Haestasaurus? Janenschia? Losillasaurus Mierasaurus Moabosaurus Narindasaurus Oplosaurus? Tehuelchesaurus? Tendaguria Turiasaurus Zby Neosauropoda Diplodocoidea (see below ↓ ) Macronaria (see below ↓ ) Dubious sauropods Bothriospondylus Cardiodon Dinodocus Gigantosaurus Neosodon Qinlingosaurus Ultrasaurus Diplodocoidea Diplodocoidea Haplocanthosaurus Diplodocimorpha Rebbachisauridae Agustinia Amazonsaurus Astigmasaura Campananeyen Cienciargentina Comahuesaurus Histriasaurus Lavocatisaurus Maraapunisaurus? Nopcsaspondylus Sidersaura Xenoposeidon Zapalasaurus Khebbashia Limaysaurinae Cathartesaura Limaysaurus Rayososaurus? Rebbachisaurinae Demandasaurus Itapeuasaurus Katepensaurus Nigersaurus Rebbachisaurus Tataouinea Flagellicaudata Dicraeosauridae Amargasaurus Amargatitanis Athenar Bajadasaurus Brachytrachelopan Dicraeosaurus Dyslocosaurus? Kaatedocus Lingwulong Pilmatueia Smitanosaurus Suuwassea Tharosaurus Diplodocidae Apatosaurinae Amphicoelias? Apatosaurus Atlantosaurus? Brontosaurus Diplodocinae Ardetosaurus Barosaurus Dinheirosaurus Diplodocus Galeamopus Kaatedocus? Leinkupal Supersaurus Tornieria Macronaria Macronaria Abrosaurus Aragosaurus Bashunosaurus? Daanosaurus Dashanpusaurus? Europasaurus Haestasaurus? Yuzhoulong Camarasauridae Camarasaurus Lourinhasaurus Titanosauriformes Astrodon Duriatitan Eucamerotus Fushanosaurus Fusuisaurus Ornithopsis Pelorosaurus Rugocaudia? Brachiosauridae Abydosaurus Atlasaurus Brachiosaurus Cedarosaurus Galvesaurus? Giraffatitan Lusotitan Sonorasaurus Soriatitan Venenosaurus Vouivria Somphospondyli Angolatitan Arkharavia Astrophocaudia Austrosaurus Brontomerus Dasosaurus Chubutisaurus Dongbeititan Europatitan Fukuititan Garumbatitan Jiangxititan? Jiutaisaurus Liaoningotitan Ligabuesaurus? Liubangosaurus Oceanotitan Padillasaurus Pukyongosaurus Ruixinia Sauroposeidon Sibirotitan Tastavinsaurus Triunfosaurus Euhelopodidae Australodocus? Chiayusaurus? Erketu Euhelopus Gannansaurus Gobititan Huabeisaurus Huanghetitan Jiangshanosaurus? Liaoningotitan Nagatitan Phuwiangosaurus Qiaowanlong Silutitan Tambatitanis Tangvayosaurus Yongjinglong Yunmenglong Diamantinasauria Australotitan Diamantinasaurus Sarmientosaurus Savannasaurus Wintonotitan? Titanosauria see below↓ Titanosauria Titanosauria Abdarainurus Aegyptosaurus? Andesaurus Angolatitan? Arackar Argyrosaurus Atacamatitan Austroposeidon Baotianmansaurus Barrosasaurus Baurutitan? Bonatitan? Borealosaurus Brasilotitan Choconsaurus Daxiatitan Dongyangosaurus Dreadnoughtus? Elaltitan Epachthosaurus? Gandititan Hamititan Huabeisaurus Jiangshanosaurus? Kaijutitan Karongasaurus Laplatasaurus Ligabuesaurus? Magyarosaurus Malarguesaurus? Malawisaurus Mnyamawamtuka Narambuenatitan Ninjatitan Normanniasaurus Nullotitan Pellegrinisaurus? Petrobrasaurus Petrustitan Pitekunsaurus Rapetosaurus Rukwatitan Ruyangosaurus Tastavinsaurus? Tengrisaurus? Tiamat Traukutitan Trigonosaurus Sonidosaurus Uberabatitan Uriash Volgatitan Xianshanosaurus Diamantinasauria? Lirainosaurinae Ampelosaurus Atsinganosaurus Garrigatitan Lirainosaurus Lohuecotitan Mansourasaurus Paludititan Eutitanosauria Inawentu Menucocelsior Colossosauria Antarctosaurus Baalsaurus Bonitasaura Chucarosaurus Epachthosaurus? Jainosaurus Quetecsaurus Tengrisaurus? Vahiny Rinconsauria Adamantisaurus Chadititan Maxakalisaurus? Muyelensaurus Overosaurus Panamericansaurus Rinconsaurus Aeolosaurini Aeolosaurus Arrudatitan Bravasaurus Baurutitan Caieiria Gondwanatitan Punatitan Shingopana Lognkosauria Drusilasaura Dzharatitanis? Futalognkosaurus Jiangxititan? Mendozasaurus Notocolossus Puertasaurus Argentinosaurus Patagotitan Phosphatotitan Saltasauroidea Bustingorrytitan Titanomachya Udelartitan Yeneen Nemegtosauridae Nemegtosaurus Quaesitosaurus? Tapuiasaurus? Saltasauridae Igai Isisaurus? Qingxiusaurus Quaesitosaurus? Opisthocoelicaudiinae Abditosaurus? Alamosaurus Dreadnoughtus? Opisthocoelicaudia Pellegrinisaurus? Qunkasaura Zhuchengtitan? Saltasaurinae Abditosaurus? Bonatitan? Ibirania Maxakalisaurus? Neuquensaurus Paralititan Rocasaurus Saltasaurus Yamanasaurus Dubious titanosaurs Bruhathkayosaurus? Campylodoniscus Clasmodosaurus Hypselosaurus Iuticosaurus Loricosaurus Macrurosaurus? Microcoelus Mongolosaurus? Titanosaurus Topics in sauropodomorph research Sauropod neck posture Sauropod hiatus List of sauropod species

Taxon identifiers Demandasaurus Wikidata: Q1932503 Wikispecies: Demandasaurus GBIF: 8641972 Open Tree of Life: 6150654 Paleobiology Database: 202269

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