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Late Cretaceous) of Patagonia, Argentina Juárez Valieri et al.: A new hadrosauroidRev. from Mus. Patagonia Argentino Cienc. Nat., n.s.217 12(2): 217-231, 2010 Buenos Aires, ISSN 1514-5158 A new hadrosauroid (Dinosauria: Ornithopoda) from the Allen Formation (Late Cretaceous) of Patagonia, Argentina Rubén D. JUÁREZ VALIERI1, José A. HARO2, Lucas E. FIORELLI3 & Jorge O. CALVO4 1 Centro Paleontológico Lago Barreales (CePaLB). Universidad Nacional del Comahue. Ruta Provincial N° 51, km 65. (8300). Neuquén, Argentina. [email protected]. 2Centro de Investigaciones Paleobiológicas (CIPAL). Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba. Velez Sarfield 299 (5000). Córdoba, Argentina. [email protected]. 3Centro Regional de Investigaciones Científica y Transferencia Tecnológica (CRILAR). Entre Ríos y Mendoza. (5301). Anillaco, La Rioja, Argentina. lfiorelli@ crilar-conicet.com.ar. 4Centro Paleontológico Lago Barreales (CePaLB). Universidad Nacional del Comahue. Ruta Provincial N° 51, km 65. (8300).��������������������������������������� Neuquén, Argentina. jorgecalvo@�royectodino.com.ar Abstract: ����A new ������������������������������������������������������������������������������������������������hadrosauroid taxon from the Late Cretaceous Allen Formation is erected, on the basis of abundant cranial and postcranial material from the Salitral Moreno locality of the Rio Negro Province, Argentina. The ne taxon is here named as Willinakaqe salitralensis gen. et s�. nov., which is characterized by having an auta�omor- �hous premaxilla with a long and convex rostrolateral surface rostral to the narial fossa and associated postcrania develo�ing an unique character combination, including: dorsal vertebrae with a shallo fossa u�on the base of the transverse processes; sacral and proximal caudal neural s�ines more than three times the height of the centrum; distal region of the postacetabular process of ilium ventrally deflected, among others. This new hadrosauroid closely resembles Secernosaurus koerneri, the other valid hadrosauroid s�ecies from South America, based in several syna�omor�hies, as: angle greater than 115° beteen the lateral margin of the facet for sca�ular articulation and the glenoid in the coracoid; su�ra-acetabular process of the ilium asymmetrical, caudodorsal margin of ilium with a ell-defined ridge continuous with the dorsal margin of the proximal region of the postacetabular process. Moreover, �revious records of Lambeosaurinae from the Late Cretaceous of South America are referred to W. salitralensis, and thus, the presence of lambeosaurines in this continent is here rejected. Accordingly, Willinakaqe salitralensis gen. et s�. nov. is currently the only hadrosauroid s�ecies re�orted from the Allen Formation. Key words: Hadrosauroidea, mor�hology, �alaeobiogeogra�hy, Late Cretaceous, South America. Resumen: Se erige un nuevo taxón de hadrosauroideo del Cretácico Su�erior de la Formación Allen, en base a abundante material craneal y postcraneal de la localidad de Salitral Moreno, en la Provincia de Río Negro, Ar- gentina. El nuevo taxón es denominado Willinakaqe salitralensis gen. et s�. nov., y se caracteriza por tener un �remaxilar auta�omórfico con una su�erficie rostrolateral alargada y convexa rostral a la fosa narial y postcráneos asociados con una combinación de caracteres únicos, que incluye: vértebras dorsales con una fosa poco profunda en la base de los procesos transversos, es�inas neurales sacras y caudales proximales más de tres veces más altas que el centro; región distal del proceso postacetabular del ilion desviada ventralmente, entre otros. Este nuevo hadrosauroideo es muy similar a Secernosaurus koerneri, la otra es�ecie válida de hadrosauroideo de América del Sur, con el que com�arte varias sina�omorfías, como: ángulo mayor que 115 ° entre el borde lateral de la faceta articular esca�ular y la su�erficie glenoidea en el coracoides, proceso su�ra-acetabular del ilion asimétrico, margen caudodorsal del ilion con una cresta bien definida continua con el margen dorsal de la región proximal del proceso �ostacetabular. Los registros asignados anteriormente a Lambeosaurinae del Cretácico Tardío de América del Sur son referidos a Willinakaqe salitralensis gen. et s�. nov., y por lo tanto, se rechaza la presencia de lambeosaurinos en este continente. En consecuencia, Willinakaqe salitralensis gen. et s�. nov. es actualmente la única es�ecie de hadrosauroideo re�ortada en la Formación Allen. Palabras clave: Hadrosauroidea, morfología, �aleobiogeografía, Cretácico Su�erior, América del Sur. ____________ INTRODUCTION koerneri, which is based on an incom�lete post- cranial skeleton recovered close to the Río Chico Hadrosauroids are knon from the Southern locality in the Chubut province, central Patagonia, Hemis�here ever since Casamiquela (1964) de- Argentina (Brett-Surman, 1979). Since its original scribed the first materials. The first named had- descri�tion, Secernosaurus as considered as a rosauroid from South America was Secernosaurus �roblematic taxon because some bones present a 218 Revista del Museo Argentino de Ciencias Naturales, n. s. 12 (2), 2010 Fig. 1. Ma� indicating the northern Patagonian localities from which the hadrosauroid fossils here studied have been recovered (indicated as stars). high degree of deformation; consequently, several thus providing additional evidence for an inter- anatomical characters �reviously em�loyed to American dis�ersal event at Cam�anian times assign the s�ecies as a basal hadrosauroid are (Bona�arte, 1996). �roduct of ta�honomic processes (Brett-Surman, Hoever, �osterior authors suggested that 1979; Bona�arte et al., 1984; Bona�arte, 1996). Kritosaurus australis may not belong in fact to Additionally, the �recise stratigra�hical �rove- Kritosaurus, and the s�ecies as considered as nance of Secernosaurus is unknon, decreasing its “K.” australis (Horner et al., 2004). Recent revi- biostratigra�hical and biogeogra�hical relevance sions of the material assigned to “Kritosaurus” (Bona�arte, 1996; Prieto-Márquez & Salinas, australis led to the pro�osal that this pur�orted 2010). The second s�ecies of Hadrosauroidea s�ecies corres�onds to the genus Secernosaurus, �ro�osed and described for Cretaceous beds in i.e. S. australis (Wagner, 2001), and more recently, South America is Kritosaurus australis, coming to the hy�othesis of its synonymy with the ty�e from the Los Alamitos ranch, Río Negro province, s�ecies, Secernosaurus koerneri (Prieto-Már- northeastern Patagonia (Bona�arte et al., 1984). quez & Salinas, 2010). In this way, Kritosaurus This taxon is re�resented by several s�ecimens, australis is here considered as a junior synonym com�rising cranial and �ostcranial remains of of Secernosaurus koerneri, folloing the latter �artial skeletons, hich ere recovered in the suggestion. middle levels of Los Alamitos Formation, which In the present work, we describe ne hadro- is late Cam�anian or early Maastrichtian in age. sauroid materials from the Salitral Moreno area, K. australis as the most com�lete hadrosauroid coming from the same locality where the remains s�ecies hitherto described for South America, of the pur�orted lambeosaurine were recovered and its assignment to the North American genus (Juárez Valieri et al., 2007). Based on these s�eci- Kritosaurus was considered as a strong landmark mens, as well as Poell’s (1987) “lambeosaurine”, in order to determine the provenance and time and further material previously re�orted from the of arrival of this group of dinosaurs to South Allen Formation (González Riga & Casadío, 2000), America (Bona�arte & Rougier, 1987; Bona�arte, e erect a ne hadrosauroid taxon. 1996). A third unnamed hadrosauroid taxon as thought to be present in South America (Poell, MATERIALS AND METHODS 1987), described on the basis of an incom�lete �ostcranial skeleton from the loer section of the We follow the nomenclature and definition Allen Formation, Salitral Moreno area, northern of the clades among Hadrosauroidea described Patagonia. This s�ecimen as considered as by Prieto-Márquez (2010), and the suggestions belonging to the Lambeosaurinae, contrasting of the second edition of the com�endium “The ith the “hadrosaurine” assignment pro�osed for Dinosauria” by Weisham�el et al. (2004) regarding Secernosaurus koerneri and Kritosaurus australis, anatomical orientations. Juárez Valieri et al.: A new hadrosauroid from Patagonia 219 Anatomical abbreviations Holotype. MPCA-Pv SM 8, a right premax- ac: acetabulum, aig: cranial intercondylar illa. groove, as: alveolar sulci, cf: coracoid foramen, c�: coronoid process, d: dentary, dc: delto�ectoral Paratypes. MPCA-Pv SM 2, partial skeleton crest, d��: dorsal process of predentary, ds: distal including: dorsal, sacral and caudal vertebrae, shaft, en: external naris, er: edentulous region, f: ossified ligaments, haema�o�hyses, ribs, left frontal, fo: foramina, gl: glenoid, ilr: iliac ramus, sca�ula, right ilium and ischium, femora, tibiae, i�: iliac peduncle, is: ischial shaft, md�: maxillary fibulae, calcanea and distal tarsals, and left astra- dorsal process, mf: maxillary foramen, mc: medial galus and foot; MPCA-Pv SM 12, left maxillae with carina (=�rimary carina), nc: neural channel, nf: teeth; MPCA-Pv SM 03, right loer ja, including nutrient foramen, ns: neural s�ine, �: �arietal, dentary, surangular, angular, and teeth; MPCA-Pv �a: pa�illa, pb: pubic bar, pd: predentary, pdf: pre- SM 27, left sca�ula; MPCA-Pv SM 29, right cora- dentary facet, po: postorbital, po�: postacetabular coid; MPCA-Pv
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