page_title: Leonerasaurus
section_title: Discovery
hierarchical_section_title: Leonerasaurus / Discovery
caption_attribution_description: Right humerus of Leonerasaurus taquetrensis (MPEF-PV 1663). A–B, anterior view. C–D, posterior view. E–F, lateral view. Scale bar represents 10 mm. Hatched pattern represents broken surfaces. Abbreviations: cf, cuboid fossa; dc, deltopectoral crest; it, internal tuberosity.
context_page_description: Leonerasaurus is a basal genus of sauropodomorph dinosaur. Currently, there is only one species known, named L. taquetrensis by Diego Pol, Alberto Garrido and Ignacio A. Cerda in 2011. The fossil, an incomplete subadult individual, was found in the Las Leoneras Formation in Argentina. This formation is probably Early Jurassic in age. Leonerasaurus was a small non-sauropod sauropodomorph, showing an unusual combination of basal and derived characters. This indicates that the evolution of early sauropodomorphs witnessed a great degree of convergent evolution.
context_section_description: The fossils assigned to Leonerasaurus were found near Cañadón Las Leoneras (an affluent of the left margin of the Chubut river), southeast of Sierra de Taquetrén, Chubut Province, Central Patagonia, Argentina. This formation is probably early Jurassic in age, interpreted as Pliensbachian to Toarcian or late Sinemurian to Toarcian. The volcanic facies of the overlying Lonco Trapial Formation is certainly from the Middle Jurassic, so that the younger boundary of the Las Leoneras Formation is well constrained. However, a Late Triassic affinity cannot be rules out, because the lower constraint of the formation is not well-defined.
caption: Right humerus in anterior, posterior, and lateral view
exif: {"Image ImageWidth": "3964", "Image ImageLength": "2282", "Image BitsPerSample": "[8, 8, 8]", "Image Compression": "LZW", "Image PhotometricInterpretation": "2", "Image Orientation": "Horizontal (normal)", "Image SamplesPerPixel": "3", "Image XResolution": "600", "Image YResolution": "600", "Image PlanarConfiguration": "1", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "Adobe Photoshop CS3 Windows", "Image DateTime": "2011:01:28 03:21:03", "Image ExifOffset": "252", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail JPEGInterchangeFormat": "390", "Thumbnail JPEGInterchangeFormatLength": "6159", "EXIF ColorSpace": "Uncalibrated", "EXIF ExifImageWidth": "3964", "EXIF ExifImageLength": "2282"}