APPENDIX 2. Abbreviations used in the text and on figures.

Anatomical. a, angular; acdl, anterior centrodiapophyseal lamina; aof, antorbital fenestra; ba, basicranium; bo, basioccipital; bp, basipterygoid process; bt, basaltubera; ca, caudal vertebra; ce, cervical vertebra; ch, chevron; co, coracoid; cof, coracoid foramen; cr, cervical rib; d, dentary; di, diapophysis; do, dorsal vertebra; dr, dorsal rib; en, external naris; f, frontal; fi, fibula; fm, foramen magnum; gl, glenoid; hu, humerus; ic, canal for the internal carotid artery; ift, infratemporal fenestra; is, ischium; j, jugal; l, lacrimal; ls laterosphenoid; m, maxilla; mf, metotic foramen; mp, metapodial; n, nasal; nc, neural canal; o, orbit; oc, occipital condyle; ost, osteoderm; p, parietal; pa, parapophysis; pcdl, posterior centrodiapophyseal lamina; ple, pleurocoel; pm, premaxilla; po, postorbital; pop, paraoccipital process; posl, post-spinal lamina; poz, postzygapophysis; pra, preantorbital opening; prf, prefrontal; prsl, pre-spinal lamina; prz, prezygapophysis; q, quadrate; qj, quadratojugal; Roman numerals, canals for cranial nerve IV, V, XII; sa, surangular; sar, sacral rib; snf, subnarial foramen; soc, supraoccipital; sp, neural spine; sq, squamosal; stf, supratemporal fenestra; stp, sternal plate, sy, sacricostal yoke; thu, theropod ungula; u, ungula; ul, ulna.

Institutional. BYU, Brigham Young University, Provo, Utah, USA; CM, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA; DGM, Museo de la División de Geología y Mineralogía de la Directión Nacional de Producción Mineral, Rio de Janeiro, Brazil; FMNH, Field Museum of Natural History, Chicago, Illinois, USA; MACN-CH, Museo Argentino de Ciencias Naturales, “Bernadino Rivadavia” Buenos Aires, Colección Chubut, Argentina; MACN- N, Museo Argentino de Ciencias Naturales, “Bernadino Rivadavia” Buenos Aires, Neuquen, Argentina; Mal, Malawi Department of Antiquities Collection, Lilongwe and Nguludi, Malawi; MPCA, Museo Provincial “Carlos Ameghino” de Cipolletti, Rio Negro, Argentina; MUCPv, Museo de la Universidad Nacional del Comahue, Paleovertebrados, Comahue, Argentina; PVL, Instituto Miguel Lillo de la Universidad de Tuçuman, Tuçuman, Argentina; PVPH, Paleontología de Vertebrados, Museo “Carmen Funes”, Plaza, Huincul, Provincial del Neuquén, Argentina; SAM, South African Museum, Cape Town, South Africa; SMU, Shuler Museum of Paleontology, Southern Methodist University, Dallas, USA.