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Historia Natural ISSN 0326-1778 Tercera Serie Volumen 3 (1) 2013 ISSN 1853-6581 HISTORIA NATURAL BUE NOS AIRES, ARGENTINA HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013 Historia Natural es una publicación periódica, semestral, especializada, dedicada a las ciencias naturales, editada por la Fundación de Historia Natural Félix de Azara y el Departamento de Ciencias Naturales y Antropológicas de la Universidad Maimónides. Fundador: Julio R. Contreras. Editores: Sergio Bogan y Federico Agnolin. Copyright: Fundación de Historia Natural Félix de Azara. Diseño: Mariano Masariche. Comité Asesor: Dr. José F. Bonaparte (Museo Municipal de Ciencias Naturales “Carlos Ameghino”, Argentina). Dr. Michael A. Mares (Sam Noble Museum, University of Oklahoma, Estados Unidos). Dr. Horacio H. Camacho (Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina). Dr. Ricardo Bastida (Universidad Nacional de Mar del Plata, Argentina). Dr. Hugo L. López (Museo de La Plata, Argentina). Dr. Jorge V. Crisci (Museo de La Plata, Argentina). Dr. Álvaro Mones (Franzensbadstr, Augsburg, Alemania). Dr. Adrià Casinos (Universidad de Barcelona, España). Dr. Julio R. Contreras (Universidad Nacional de Pilar, Paraguay). Comité Editor: Dra. Ana M. Faggi (Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina). Dr. David A. Flores (Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina). Dr. Luis Cappozzo (Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Argentina).- Dr. Jorge D. Williams (Museo de La Plata, Argentina). Dr. Carlos Darrieu (Museo de La Plata, Argentina). Dr. Marcos Mirande (Instituto Miguel Lillo, Argentina). Dr. Gustavo Darrigran (Museo de La Plata, Argentina). Fundación de Historia Natural Félix de Azara Departamento de Ciencias Naturales y Antropológicas Universidad Maimónides - Hidalgo 775 P. 7º Ciudad Autónoma de Buenos Aires - República Argentina (54) 11-4905-1100 int. 1228 / www.fundacionazara.org.ar Impreso en Argentina - 2013 Se ha hecho el depósito que marca la ley 11.723. No se permite la reproducción parcial o total, el almacenamiento, el alquiler, la transmisión o la transformación de esta revista, en cualquier forma o por cualquier medio, sea electrónico o mecánico, mediante fotocopias, digitalización u otros métodos, sin el permiso previo y escrito del editor. Su infracción está penada por las leyes 11.723 y 25.446. HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013 Fundación de Historia Natural Félix de Azara Departamento de Ciencias Naturales y Antropológicas Universidad Maimónides - Hidalgo 775 P. 7º Ciudad Autónoma de Buenos Aires - República Argentina (54) 11-4905-1100 int. 1228 / www.fundacionazara.org.ar ISSN 0326-1778 y ISSN 1853-6581 HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013/5-12 A PARTIAL PTEROSAUR ULNA FROM THE CANDELEROS FORMATION (NEUQUÉN GROUP), LATE CRETACEOUS OF ARGENTINA Una ulna parcial de Pterosauria de la Formación Candeleros (Grupo Neuquén), Cretácico tardío de Argentina Alejandro Haluza1 y Juan I. Canale1, 2 1Museo Municipal “Ernesto Bachmann”, Dr. Natali S/N, Villa El Chocón, Neuquén, Argentina. [email protected] 2CONICET. 5 HaluZA A. and Canale J. I. Resumen. Se describe la porción proximal de una ulna izquierda de un pterosaurio. El ejemplar procede de la Formación Candeleros (Cenomaniano), Grupo Neuquén, en Cabo Alarcón, provincia de Neuquén, Argentina. El análisis de este nuevo ejemplar permite la reinterpretación de una tibia de pterosaurio previamente descrita, hallada en la localidad de Los Catutos, Neuquén (MOZ 2280 P) como un proximal de ulna. El nuevo material pertenece a un pterosaurio de tamaño medio, considerablemente más grande que los pterosaurios previamente registrados de esta unidad geológica. El análisis de la correlación entre la longitud de la ulna-longitud del pié en pterosaurios pterodactyloideos bien conocidos muestra que la nueva ulna se corresponde bien con el tamaño inferido para el productor de Pteraichnus isp. registrado en la misma formación. Palabras clave. Pterosauria, Cretácico, Grupo Neuquén, Formación Candeleros, Argentina. Abstract. The proximal portion of the left ulna of a pterosaur is described. The specimen comes from the Candeleros Formation (Cenomanian), Neuquén Group, at Cabo Alarcón, Neuquén province, Argentina. The analysis of this new specimen allows the re-interpretation of a previously described pterosaur tibia founded at Los Catutos locality, Neuquén (MOZ 2280 P) as a proximal ulna. The new material belongs to a medium-sized pterosaur, considerably larger than previously recorded pterosaurs from this geological unit. The analysis of correlation between ulnar length-pes length in well-known pterodactyloid pterosaurs shows that the new ulna matches well with the inferred size of the Pteraichnus isp. trackmaker recorded from the same formation. Key words. Pterosauria, Cretaceous, Neuquén Group, Candeleros Formation, Argentina. 6 HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013/5-12 pterosaur ulna from the Cenomanian of Neuquén Basin INTRODUCTION et al., 2007) and a phalanx I of manual dig- it IV from the “La Bonita” locality (Bajo Pterosaur remains from the Cretaceous de La Carpa Formation: Late Santonian- of South America are well represented Early Campanian) of Río Negro Province only in the Early Cretaceous Crato and Ro- (Apesteguía pers. comm.). mualdo formations of northeastern Brazil Here we describe a new record of a pte- (Kellner, 1990; Kellner and Tomida, 2000; rosaur proximal left ulna collected from Martill, 1993; Price, 1971; Wellnhofer, 1985; the lower levels of the Candeleros Forma- Wellnhofer, 1991a; Wellnhofer 1991b), and tion at Cabo Alarcón, northwestern coast Lagarcito Formation of western Argenti- of Lake Ezequiel Ramos Mexía, Neuquén na (Bonaparte, 1970; Chiappe, et al., 1995; Province, Argentina (Figure 1). Chiappe et al., 1998a, b). Otherwise, only a few Cretaceous units in South America Institutional abbreviations. BSP, Bay- have yielded fragmentary pterosaur re- erische Staatssammlung für Paläontologie mains. Pterosaurs are scarce in the Neu- und historische Geologie, Munich, Ger- quén Group but some discoveries have many. MMCH-PV, Museo Municipal “Er- been made in recent years. These records nesto Bachmann”, Villa El Chocón, Neu- include a distal right ulna and partially quén, Argentina. MOZ, Museo Provin- preserved right wing from the “La Buitre- cial “Juan Olsacher”, Zapala, Neuquen, ra” locality (Candeleros Formation: Early Argentina. MPCN, Museo Patagónico Cenomanian) of Río Negro Province (Ha- de Ciencias Naturales, General Roca, Río luza et al., 2007), a proximal right ulna Negro, Argentina. MUCPv. Museo de la from the “Los Barreales” locality (Port- Universidad Nacional del Comahue, Pa- ezuelo Formation: Late Turonian-Early leontología de Vertebrados, Neuquén, Ar- Coniacian) of Neuquén Province (Kellner gentina. Figure 1. Map of Argentina showing the Cabo Alarcón fossil locality. The black arrow indicates the fossil site. HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013/5-12 HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013/5-12 7 HaluZA A. and Canale J. I. SYSTEMATIC PALEONTOLOGY DESCRIPTION AND COMPARISONS Pterosauria Kaup, 1834 The ulna is anteroposteriorly crushed Pterodactyloidea Plieninger, 1901 and deformed, mainly in the proximal end, Genus and species indeterminate and the distal portion of the bone is lost (Figure 2). The bone is thin-walled (about 1 Referred material. MMCH-Pv 53, proximal mm thick) as seen in all other pterosaurs. In part of a left ulna. anterior view the dorsal margin is straight, and the ventral margin is concave due to a Locality and horizon. The material was col- ventral expansion of the proximal end. Be- lected at Cabo Alarcón (S 39º 24´ 16,4”- W low this expansion there is a prominence, 68º 58´ 27,6”) between Villa El Chocón and the tuberculum musculi bicipitis (TMB), Picún Leufú (Fig. 1), from the lower levels which is more ventrally displaced than in of the Candeleros Formation (Early Cenom- the ulna of Santanadactylus pricei (AMNH anian), Neuquén Group (Garrido, 2010). 22552: Wellnhofer, 1985, 1991a; Kellner Figure 2 - MMCH-Pv 53 Pterosaur proximal ulna found at Cabo Alarcón in A,F, proximal, B,G, anterior, C,H, dorsal, D,I, posterior, and E,J, ventral views. Abbreviations: csr: contact surface with radius; cc: capitular cotyle; tc: trochlear cotyle; ol: olecranon; pd: posterior depression; tmb: tuberculum musculi bicipitis. 8 HISTORIA NATURAL Tercera Serie Volumen 3 (1) 2013/5-12 pterosaur ulna from the Cenomanian of Neuquén Basin and Tomida, 2000; BSP 1980 I 122: Welln- quén, Argentina, (see also Codorniú and hofer, 1985). A small pneumatic foramen is Gasparini, 2007); following the description present proximal to the TMB of the above- of Araripesaurus sp. given by Wellnhofer mentioned species, but the preservation of (1985). The proximal end of pterodactyloid MMCH-Pv 53 does not allow observation ulna presents a sub-triangular outline, with of this foramen. The preserved portion of two anteriorly facing concave surfaces and the shaft shows in its anterior face two lon- a posterior prominence. This morphology gitudinal low ridges that suggest the con- is clearly seen in both MMCH-PV 53 and tact area with the radius (Figure 2 B, G). P 2280 MOZ. Following the considerations In proximal view there are two concave, given by Wellnhofer (1988), Kellner (1990), anteroproximally facing articular surfaces: and taking in count the anatomical features a dorsal one, the capitular cotyle (sensu observed in Los Catutos material; we re-in- Bennett,
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