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THE FIRST RECORD OF XIPHACTINUS LEIDY, 1870 (TELEOSTEI, ICHTHYODECTIFORMES) IN THE UPPER CRETACEOUS OF SOUTH AMERICA (LA LUNA FORMATION, VENEZUELA). This paper describes the fossil remains of an Ichthyodectiform fish collected in the Cenomanian limestones belonging to La Aguada Member, La Luna Formation, near Monay, Candelaria Municipality, Trujillo State, western Venezuela. This fossil consists of fragments of the nasal region of the skull, both jaws, and four vertebrae of the same individual. Despite the fragmentary condition of this fossil, its preserved characteristics show that it is a representative of the genus Xiphactinus Leidy. These characters are the occurrence of conic, caniniform teeth of irregular size set within deep alveolar cavities forming a single row in the maxilla, premaxilla, and dentary bones; hypertrophied premaxilla teeth; and a wide maxilla-premaxilla articulation that involves the entire height of both bones. Unfortunately, there are not enough characters preserved to determinate the specific identity of this fossil; nevertheless, this finding of Xiphactinus in a South American locality represents the first report of this genus from the marine domains of the Mesozoic Gondwana. This report extends the paleobiogeographic distribution of Xiphactinus that is well known through previous findings in Cretaceous (Albian-Maastrichthian) marine localities, within the Inland Sea of North America and the northern border of the Tethys Sea in Europe.

Primer registro de Xiphactinus Leidy, 1870 (Teleostei, Ichthyodectiformes) en el Cretácico Superior de América del Sur (Formación La Luna, Venezuela)