The year 2011 in archosaur paleontology was eventful. Archosaurs include the only living dinosaur group — birds — and the reptile crocodilians, plus all extinct dinosaurs, extinct crocodilian relatives, and pterosaurs. Archosaur palaeontology is the scientific study of those animals, especially as they existed before the Holocene Epoch began about 11,700 years ago. The year 2011 in paleontology included various significant developments regarding archosaurs.

This article records new taxa of fossil archosaurs of every kind that have been described during the year 2011, as well as other significant discoveries and events related to paleontology of archosaurs that occurred in the year 2011.

Newly named crurotarsans

Name Novelty Status Authors Age Unit Location Notes ImagesAcherontisuchusGen. et sp.Valid Hastings Bloch JaramilloMiddle/Late PaleoceneCerrejón Formation A dyrosaurid.AnteophthalmosuchusGen. et sp.Valid Salisbury NaishEarly CretaceousWealden Group A goniopholidid.ArenysuchusGen. et sp.Valid Puértolas Canudo Cruzado-CaballeroMaastrichtianTremp Formation Originally interpreted as a stem crocodyloid, now considered an allodaposuchid.CaipirasuchusGen. et sp.Valid Iori CarvalhoTuronian/SantonianAdamantina Formation A sphagesaurid.CampinasuchusGen. et sp.Valid Carvalho Teixeira et al.Carvalho, Teixeira, Ferraz, Ribeiro, Martinelli, Neto, Sertich, Cunha, Cunha, Ferraz.Turonian/SantonianAdamantina Formation A baurusuchid.CaryonosuchusGen. et sp.Valid Kellner Campos et al.Kellner, Campos, Riff, de Andrade.Campanian/MaastrichtianAdamantina Formation A sphagesaurid.DecuriasuchusGen. et sp.Valid França Ferigolo LangerLadinianSanta Maria Formation Skeletons indicate possible group behavior.FruitachampsaGen. et sp.Valid ClarkLate JurassicMorrison Formation A shartegosuchid.Goniopholis kiplingiSpeciesValid de Andrade Edmonds et al.de Andrade, Edmonds, Benton, Schouten.BerriasianPurbeck Limestone Group A goniopholidid.Goniopholis willettiSpeciesValid Salisbury NaishEarly CretaceousWealden Group A goniopholidid. Originally described as a species of Goniopholis; it was subsequently made the type species of a separate genus Hulkepholis.LabidiosuchusGen. et sp.Valid Kellner Figueiredo et al.Kellner, Figueiredo, Azevedo, Campos.MaastrichtianMarília Formation A notosuchian.LeiokarinosuchusGen. et sp.Disputed Salisbury NaishEarly CretaceousWealden Group A neosuchian. Jouve (2017) considered it to be a junior synonym of Anteophthalmosuchus.LorosuchusGen. et sp.Valid Pol PowellPaleoceneRío Loro Formation A sebecid.NeptunidracoGen. et sp.Valid Cau Fantilate Bajocian/early BathonianRosso Ammonitico Veronese Formation The oldest known metriorhynchid.PepesuchusGen. et sp.Valid Campos Oliveira et al.Campos, Oliveira, Figueiredo, Riff, Azevedo, Carvalho, KellnerCampanian/MaastrichtianPresidente Prudente Formation An itasuchid.PietraroiasuchusGen. et sp.Valid Buscalioni Piras et al.Buscalioni, Piras, Vullo, Signore, BarberaEarly AlbianPietraroia Plattenkalk A hylaeochampsid.PissarrachampsaGen. et sp.Valid Montefeltro Larsson LangerCampanian/MaastrichtianVale do Rio do Peixe Formation A baurusuchid. The type species is Pissarrachampsa sera.Theriosuchus grandinarisSpeciesValid Lauprasert Laojumpon et al.Lauprasert, Laojumpon, Saenphala, Cuny, Thirakhupt, SuteethornBerriasian/BarremianKhua Formation A fifth species of Theriosuchus.

Newly named non-avian dinosaurs

Name Novelty Status Authors Age Unit Location width="33%" Notes ImagesAcristavus Gen. et sp.Valid Gates Horner et al.Gates, Horner, Hanna, Nelson.CampanianTwo Medicine Formation Wahweap Formation A brachylophosaurin hadrosaurine. Aeolosaurus maximusSp.Valid Santucci de Arruda-CamposCampanian-MaastrichtianAdamantina Formation A titanosaur sauropod. Originally described as the third species of Aeolosaurus, but subsequently transferred to the separate genus Arrudatitan.Ahshislepelta Gen. et sp.Valid Burns SullivanLate CampanianKirtland Formation An ankylosaurine ankylosaurid.Albinykus Gen. et sp.Valid Nesbitt Clarke et al.Nesbitt, Clarke, Turner, Norell.Late Cretaceous An alvarezsaurid theropod.Amtocephale Gen. et sp.Valid Watabe Tsogtbaatar SullivanTuronian-SantonianBaynshire Formation A pachycephalosaurid.Angolatitan Gen. et sp.Valid Mateus Jacobs et al.Mateus, Jacobs, Schulp, Polcyn, Tavares, Neto, Morais, Antunes.Late TuronianItombe Formation A somphospondylian sauropod.ArcusaurusGen. et sp.Valid Yates Bonnan NevelingLower JurassicElliot Formation Basal SauropodomorphAtacamatitan Gen. et sp.Valid Kellner Rubilar-Rogers et al.Kellner, Rubilar-Rogers, Vargas, SuárezLate CretaceousTolar Formation A titanosaur.Brontomerus Gen. et sp.Valid Taylor Wedel CifelliAptian/AlbianCedar Mountain Formation A camarasauromorph sauropod.Daemonosaurus Gen. et sp.Valid Sues Nesbitt et al.Sues, Nesbitt, Berman, HenriciLate TriassicChinle Formation A primitive theropod.DelapparentiaGen. et sp.Valid Ruiz-OmeñacaEarly BarremianCamarillas Formation An iguanodontoid.Demandasaurus Gen. et sp.Valid Fernández-Baldor Canudo et al.Fernández-Baldor, Canudo, Huerta, Montero, Pereda Suberbiola, Salgado.Late Barremian-early AptianCastrillo la Reina Formation A rebbachisaurid sauropod.Drusilasaura Gen. et sp.Valid Navarrete Casal MartínezCenomanian/TuronianBajo Barreal Formation A possible lognkosaurian titanosaur.Eodromaeus Gen. et sp.Valid Martinez Sereno et al.Martinez, Sereno, Alcober, Colombi, Renne, Montañez, Currie.Middle CarnianIschigualasto Formation A basal theropod.EpichirostenotesGen. et sp.Valid Sullivan Jasinski Van TommeLate CampanianHorseshoe Canyon Formation A caenagnathid.HayaGen. et sp.Valid Makovicky Kilbourne et al.Makovicky, Kilbourne, Sadleir, Norell.Late CretaceousJavkhlant Formation Basal ornithopod with many gastroliths.JaklapallisaurusGen. et. sp.Valid Novas Ezcurra et al.Novas, Ezcurra, Chatterjee, Kutty.Late Norian-earliest RhaetianUpper Maleri Formation Lower Dharmaram Formation A plateosaurid.KoreaceratopsGen. et sp.Valid Lee Ryan KobayashiAlbian"Tando beds" A basal ceratopsian.KoreanosaurusGen. et sp.Valid Huh Lee et al.Huh, Lee, Kim, Lim, Godefroit.?Santonian/CampanianSeonso Conglomerate A hypsilophodontid ornithopod. LeonerasaurusGen. et sp.Valid Pol Garrido CerdaPliensbachian/ToarcianLas Leoneras Formation An anchisaurian sauropodomorph. LeyesaurusGen. et sp.Valid Apaldetti Martinez et al.Apaldetti, Martinez, Alcober, Pol.Lower JurassicQuebrada del Barro Formation A massospondylid sauropodomorph. LinhenykusGen. et sp.Valid Xu Sullivan et al.Xu, Sullivan, Pittman, Choiniere, Hone, Upchurch, Tan, Xiao, Tan, Han.CampanianWulansuhai Formation An alvarezsaurid. LinhevenatorGen. et sp.Valid Xu Tan et al.Xu, Tan, Sullivan, Han, Xiao.CampanianBayan Mandahu Formation A short-armed troodontid. ManidensGen. et sp.Vald Pol Rauhut BecerraAalenian/Early BathonianCañadón Asfalto Formation A heterodontosaurid.NambaliaGen. et. sp.Valid Novas Ezcurra et al.Late Norian-earliest RhaetianUpper Maleri Formation A basal sauropodomorph. NarambuenatitanGen. et sp.Valid Filippi García Garridolower-middle CampanianAnacleto Formation A lithostrotian titanosaur.OjoraptorsaurusGen. et sp.Valid Sullivan Jasinski Van TommeLower MaastrichtianOjo Alamo Formation A caenagnathid.Omeisaurus jiaoi SpeciesValid Jiang Li et al.Jiang, Li, Peng, YeMiddle JurassicXiashaximiao Formation A species of Omeisaurus.OsmakasaurusGen. et comb.Valid McDonaldValanginianLakota Formation A new genus for "Camptosaurus" depressus (Gilmore, 1909).OxalaiaGen. et sp.Valid Kellner Azvedo et al.Kellner, Azvedo, Machado, Carvalho, Henriques.CenomanianAlcântara Formation Huge spinosaur 12–14 m long.PampadromaeusGen. et sp.Valid Cabreira Schultz et al.Schultz, Bittencourt, Soares, Fortier, Silva, Langer.Carnian Santa Maria Formation A very basal sauropodomorph.PamparaptorGen. et sp.Valid Porfiri Calvo SantosTuronian/ConiacianPortezuelo Formation A deinonychosaur.Petrobrasaurus Gen. et sp.Valid Filippi Canudo et al.Filippi, Canudo, Salgado, Garrido, Garcia, Cerda, Otero.SantonianPlottier Formation A titanosaur. PropanoplosaurusGen. et sp.Valid Stanford Weishampel DeleonEarly AptianPatuxent Formation A nodosaurid.Qiupalong Gen. et sp.Valid Xu Kobayashi et al.Xu, Kobayashi, Lü, Lee, Liu, Tanaka, Zhang, Jia, Zhang.Late CretaceousQiupa Formation An ornithomimid.RatchasimasaurusGen. et sp.Valid Shibata Jintasakul AzumaAptianKhok Kruat Formation A non-hadrosaurid iguanodontian.Sarahsaurus Gen. et sp.Valid Rowe Sues ReiszSinemurian/PliensbachianKayenta Formation A basal sauropodomorphSiamodon Gen. et sp.Valid Buffetaut SuteethornAptianKhok Kruat Formation An advanced iguanodontian.Spinops Gen. et sp.Valid Farke Ryan et al.Farke, Ryan, Barrett, Tanke, Braman, Loewen, Graham.CampanianOldman or Dinosaur Park Formation A centrosaurine ceratopsian.Stegoceras novomexicanum SpeciesValid Jasinski SullivanLate CampanianFruitland Formation Kirtland Formation Second known species of Stegoceras.Talos Gen. et sp.Valid Zanno Varricchio et al.Zanno, Varricchio, O'Connor, Titus, Knell.Late CampanianKaiparowits Formation A troodontid theropod.Tapuiasaurus Gen. et sp.Valid Zaher Pol et al.Zaher, Pol, Carvalho, Nascimento, Riccomini, Larson, Juarez-Valieri, Pires-Domingues, da Silva Jr., Campos.AptianQuiricó Formation A titanosaur.Teratophoneus Gen. et sp.Valid Carr Williamson et al.Carr, Williamson, Britt, Stadtman.Late CampanianKaiparowits Formation A tyrannosaurine tyrannosaurid.Thescelosaurus assiniboiensis SpeciesValid Brown Boyd RussellLate MaastrichtianFrenchman Formation Third known species of Thescelosaurus. Titanoceratops Gen. et sp.Valid LongrichLate CampanianFruitland or Kirtland Formation A giant chasmosaurine ceratopsian from New Mexico.TraukutitanGen. et sp.Valid Juárez Valieri CalvoSantonianBajo de la Carpa Formation A possible lognkosaurian titanosaur.UteodonGen. et comb. Valid McDonaldLate JurassicMorrison Formation A new genus for "Camptosaurus" aphanoecetes (Carpenter & Wilson, 2008).VeterupristisaurusGen. et sp.Valid RauhutLate Kimmeridgian/earliest TithonianTendaguru Formation A carcharodontosaurid.XiaotingiaGen. et sp.Valid Xu You et al.Xu, You, Du, Han.early Late JurassicTiaojishan Formation An Archaeopteryx-like paravian.XuwulongGen. et sp.Valid You Li LiuEarly CretaceousXinminpu Group A hadrosauriform.ZhuchengtyrannusGen. et sp.Valid Hone Wang et al.Hone, Wang, Sullivan, Zhao, Chen, Li, Ji, Ji, Xu.Late CretaceousWangshi Group A tyrannosaurine tyrannosaurid.

Newly named birds

Name Novelty Status Authors Age Unit Location Notes ImagesAlca carolinensis Sp. novValidN. Adam Smith

Julia A. ClarkeEarly PlioceneYorktown Formation:An Alcidae related to the razorbill.Alca minor Sp. novValidN. Adam Smith

Julia A. ClarkeEarly PlioceneYorktown Formation:An Alcidae related to the razorbill.Alca olsoni Sp. novValidN. Adam Smith

Julia A. ClarkeEarly PlioceneYorktown Formation:An Alcidae related to the razorbill.Alectroenas payandeei Sp. novValidJulian Pender HumeHolocene-RecentA pigeon, Columbidae from Rodrigues Island.?Aptornis proasciarostratus Sp. nov.ValidTrevor H. Worthy

Alan J. D. Tennyson

R. Paul ScofieldEarly Miocene,

AltonianManuherikia Group,

St Bathans FaunaThe earliest known Aptornithidae Bonaparte, 1856.Ardea sytchevskayae Sp. nov.ValidNikita V. ZelenkovMiddle MioceneAn Ardeidae, earliest member of ArdeaAurorornis tauricaGen. et sp. nov ValidAndrey V. PanteleyevEocene (Lutetian)Crimean PeninsulaAn owl belonging to the family Protostrigidae. The type species of the new genus.Australlus gagensis Sp. nov.ValidTrevor H. Worthy

Walter E. BolesOligocene-MioceneRiverleigh:A Rallidae. The type species is Gallinula disneyi Boles, 2005.Bohaiornis guoi Gen. nov. et Sp. nov. ValidHu Dongyu

Li Li

Hou Liannaim