Sauropod remains from the Upper Cretaceous of Lano (Northcentral Spain). Titanosaur phylogenetic relationships

BIBLIOGRAFIA
Nominativo AutoriSANZ J.L., POWELL J.E., LE LOEUFF J., MARTINEZ R., PEREDA SUBERBIOLA, X.
Anno1999
TitoloSauropod remains from the Upper Cretaceous of Lano (Northcentral Spain). Titanosaur phylogenetic relationships.
RivistaEST.MUS.CIENC.NAT.DE ALAVA
Edizione1999
Serie Volume14(Núm. Espec. 1): 235-255
IllustrazioniFIGG. 4, PLATES 6.
Parole chiave / Key words Paleontologia, Vertebrata, Dinosauri, Cretaceous, Titanosauria, Titanosauridae, Lirainosaurus astibiae.
Riassunto / AbstractThe Laño outcrop (Upper Cretaceous) is located in the Condado de Treviño (Northcentral Spain). This fossil site has yielded abundant sauropod titanosaur remains: a small occipital skull fragment, isolated teeth, dorsal and caudal vertebrae, a scapula, a coracoid, a sternal plate, several humeri, a fragment of ilium, a fragment of pubis, several femora, a tibia, a fibula, and dermal scutes. This material belongs to a new genus and species, Lirainosaurus astibiae, mainly diagnosed by the following autapomorphies: restricted articular condyle in posterior caudal vertebrae; sagittal condylar groove in posterior articular surface of distal caudal vertebrae; lamina in the interzygapophysial fossa in anterior caudal vertebrae; spinopostzygapophysial structure not posteriorly projected in posterior caudal vertebrae; lateroanterior process in sternal plate, and a ridge in the ventral margin of the medial side of scapular blade. A systematic analysis has been carried out, in order to evaluate the phylogenetic relationships of Lirainosaurus. According to this analysis, the genus Opisthocoelicaudia is a close sister taxon of Titanosauria: {Epachthosaurus [(Argyrosaurus+Saltasaurus) (Lirainosaurus + Peirópolis titanosaur)]}. This clade is mainly characterized by the presence of developed posterior condyles in anterior caudal vertebrae, an anteromedial ridge in sternal plate, and a short and laminar ischiatic process of ischium. Finally, the new clade Eutitanosauria is proposed: [(Argyrosaurus + Saltasaurus)(Lirainosaurus + Peirópolis titanosaur)]. This taxon is mainly diagnosed by the absence of hyposphene-hypantrum articulations in posterior dorsal vertebrae and a reduced femoral fourth trochanter.
Note GeograficheSpain, Autonomous Community of Castile and León, Burgos Province, Contado de Treviño. Vitoria Formation.