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| Lucianovenator bonoi |
Abstract
Coelophysoids are the most abundant theropod dinosaurs known from the Late Triassic through Early Jurassic represent the earliest major radiation of Neotheropoda. Within Coelophysoidea sensu lato the most stable clade is Coelophysidae, small theropods characterized by long neck and light and kinetic skull. Coelophysids are the most abundant basal non-Tetanurae neotheropods known worldwide, but until recently they were unknown from South America. We report here a new coelophysid neotheropod, Lucianovenator bonoi gen. et sp. nov., from the late Norian-Rhaetian Quebrada del Barro Formation, northwestern Argentina. A phylogenetic analysis recovers Lucianovenator bonoi nested into the monophyletic group Coelophysidae in an unresolved clade together with Coelophysis rhodesiensis and Camposaurus arizonensis. The presence of Lucianovenator in the late Norian-Rhaetian of Argentina increases the poor and scarce record of Triassic South American neotheropods, suggesting that the virtual absence of theropods in the fossil record during the Rhaetian is probably a taphonomic/stratigraphic bias instead of a decline in diversity and abundance after the Norian. Finally, the new find corroborates the American endemism in the Late Triassic and worldwide distribution during the Early Jurassic of coelophysid neotheropods, supporting the extreme faunal homogeneity hypothesized for Early Jurassic continental biotas.
Ricardo N. Martínez and Cecilia Apaldetti. 2017. A Late Norian-Rhaetian Coelophysid Neotheropod (Dinosauria, Saurischia) from the Quebrada del Barro Formation, Northwestern Argentina. Ameghiniana. in press. DOI: 10.5710/AMGH.09.04.2017.3065
`Lucianovenator bonoi´, el dinosaurio hallado en Caucete, único en su tipo de Sudamérica
Es un carnívoro de comienzos del Jurásico, considerado entre los más primitivos antecesores de las aves actuales. Fue presentado este viernes. Por qué lleva ese nombre.
