The study of titanosaur paleobiology has been severely hampered by the incomplete nature of their fossil record, particularly the scarcity of well-preserved and relatively complete cranial remains. Even the most complete titanosaur skulls are often fractured, incomplete, or deformed, which has resulted in a limited knowledge of the paleobiology related to cranial anatomy, especially functional morphology. In this context, we present the digital restoration of the skull of the Argentinean titanosaur Sarmientosaurus musacchioi, created using the open-source 3D modeling software Blender. The digitally restored model is freely accessible to other researchers, facilitating broader research and comparative studies. 

Sarmientosaurus mussacchioi MDT-PV 02 View specimen

	M3#1594 Cranium and mandible of Sarmientosaurus mussacchioi Type: "3D_surfaces" doi: 10.18563/m3.sf.1594   state:published	Download 3D surface file
	M3#1599 Original object provided by Gabriel Casal (cranium) Type: "3D_surfaces" doi: 10.18563/m3.sf.1599   state:published	Download 3D surface file

Speothos pacivorus is an extinct South American canid (Canidae: Cerdocyonina) from the Pleistocene of Lagoa Santa Karst, Central Brazil. This taxon is one of the hypercarnivore canids that vanished from the continent at the end of Pleistocene. Although all remains of Speothos pacivorus were collected in the 19th century by the Danish naturalist Peter W. Lund, few studies have committed to an in-depth analysis of the taxon and the known specimens. Here, we analyzed all biological remains of S. pacivorus hosted in the Peter Lund/Quaternary Collection at the Natural History Museum of Denmark, Copenhagen, by listing and illustrating all its specimens known to date. We also conducted a reconstruction of the holotype, an almost complete cranium, based on a µCT scan, producing an undeformed and crack-free three-dimensional model. With this data available we aim to foster new research on this elusive species. 

Speothos pacivorus NHMD:211341 View specimen

M3#1475 Holotype of Speothos pacivorus Type: "3D_surfaces" doi: 10.18563/m3.sf.1475   state:published

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