“…Orkoraptor burkei (Novas et al, 2008), and several recently described unnamed megaraptorans (e.g., Novas et al, 2019;Ibiricu et al, 2020) have been reported. In contrast, from Brazil, only an indeterminate specimen has been communicated (Martinelli et al, 2013).…”
The Late Cretaceous theropod fauna of South America is composed of Abelisauridae, Noasauridae, Spinosauridae, Carcharodontosauridae, Megaraptora, and Coelurosauria. These groups include mostly small (Noasauridae and Coelurosauria) and medium-to large-sized taxa (Carcharodontosauridae, Abelisauridae, and Megaraptora). Some of these lineages are predominantly Gondwanic (Abelisauridae, Noasauridae, Carcharodontosauridae, Megaraptora) and poorly represented in Laurasian landmasses. Particularly, several theropods have been reported from Patagonia, known either due to distinct anatomical features or due to their high degree of preservation, such as Carnotaurus, Skorpiovenator, Giganotosaurus, Megaraptor, Alvarezsaurus, and Unenlagia. here we describe a new incomplete tibia (MAU-PV-CM-653) from the Sierra Barrosa Formation (middle Coniacian, Upper Cretaceous), Patagonia, Argentina. MAU-PV-CM-653 shows an anteroposteriorly reduced cnemial crest that is strongly curved laterally. Finally, the tibia lacks a proximal extension of the fibular crest. These traits are reminiscent of tetanuran morphology and, together with the stratigraphic provenance of MAU-PV-CM-653, they allow us to assign it to an allosauroid theropod, thus improving the Allosauroidea global record for the middle Late Cretaceous.
“…Orkoraptor burkei (Novas et al, 2008), and several recently described unnamed megaraptorans (e.g., Novas et al, 2019;Ibiricu et al, 2020) have been reported. In contrast, from Brazil, only an indeterminate specimen has been communicated (Martinelli et al, 2013).…”
The Late Cretaceous theropod fauna of South America is composed of Abelisauridae, Noasauridae, Spinosauridae, Carcharodontosauridae, Megaraptora, and Coelurosauria. These groups include mostly small (Noasauridae and Coelurosauria) and medium-to large-sized taxa (Carcharodontosauridae, Abelisauridae, and Megaraptora). Some of these lineages are predominantly Gondwanic (Abelisauridae, Noasauridae, Carcharodontosauridae, Megaraptora) and poorly represented in Laurasian landmasses. Particularly, several theropods have been reported from Patagonia, known either due to distinct anatomical features or due to their high degree of preservation, such as Carnotaurus, Skorpiovenator, Giganotosaurus, Megaraptor, Alvarezsaurus, and Unenlagia. here we describe a new incomplete tibia (MAU-PV-CM-653) from the Sierra Barrosa Formation (middle Coniacian, Upper Cretaceous), Patagonia, Argentina. MAU-PV-CM-653 shows an anteroposteriorly reduced cnemial crest that is strongly curved laterally. Finally, the tibia lacks a proximal extension of the fibular crest. These traits are reminiscent of tetanuran morphology and, together with the stratigraphic provenance of MAU-PV-CM-653, they allow us to assign it to an allosauroid theropod, thus improving the Allosauroidea global record for the middle Late Cretaceous.
“…Australovenator wintonensis (NMV P239464 25 ) show a mediolateral sulcus (state 1). By contrast, in Megaraptor, the megaraptorids from Bajo Barreal Formation (UNPSJB-PV 944; 20 ) and Lago Colhué Huapi Formation (UNPSJB-PV 1102 and 1046; 36 , 37 ) and the referred ungual from Aerosteon 34 , a wide mediolateral platform is present (state 2). Figure 16 Comparative drawings showing the features that supports Clade “A” ( A – C ) and Clade “B” ( D – E ).…”
Section: Discussionmentioning
confidence: 99%
“…Another Maastrichtian unit from Patagonia which yielded megaraptorid remains is the Lago Colhué Huapi Formation, in Central Patagonia (Chubut Province 20 , 36 , 37 , 53 ). These records are: two isolated unguals (UNPSJB-PV 1028 and UNPSJB-PV 1102 36 , 37 ); an associated manual ungual I and metatarsal III (UNPSJB-PV 1046 and UNPSJB-PV 1066 36 , 37 ), and an as yet undescribed skeleton (UNPSJB-PV 1104 53 ). Except for the latter specimen, the size of which is unknown, all these records represent medium- to large-sized megaraptorids (more than 6 m long 20 ).…”
Section: Discussionmentioning
confidence: 99%
“…The oldest Patagonian records consist of an indeterminate megaraptorid coming from Bajo Barreal Formation (Cenomanian-Turonian 20 ) and Aoniraptor libertatem found in beds of the Huincul Formation (Cenomanian-Turonian 13 , 32 ). The following records are, from oldest to youngest, Megaraptor namunhuaiquii from the Portezuelo Formation (Coniacian 6 , 10 , 17 ), Murusraptor barrosaensis from the Sierra Barrosa Formation (Coniacian 33 ), Aerosteon riocoloradensis from the Anacleto Formation (Santonian 34 ), Tratayenia rosalesi from the Bajo de la Carpa Formation (Santonian 19 ), Orkoraptor burkei from the Cerro Fortaleza Formation (Campanian 35 ), and some indeterminate megaraptoran remains from two Maastrichtian units: Lago Colhué Huapi 36 , 37 and Chorrillo formations 3 .…”
Megaraptora is a theropod clade known from former Gondwana landmasses and Asia. Most members of the clade are known from the Early to Late Cretaceous (Barremian–Santonian), with Maastrichtian megaraptorans known only from isolated and poorly informative remains. The aim of the present contribution is to describe a partial skeleton of a megaraptorid from Maastrichtian beds in Santa Cruz Province, Argentina. This new specimen is the most informative megaraptoran known from Maastrichtian age, and is herein described as a new taxon. Phylogenetic analysis nested the new taxon together with other South American megaraptorans in a monophyletic clade, whereas Australian and Asian members constitute successive stem groups. South American forms differ from more basal megaraptorans in several anatomical features and in being much larger and more robustly built.
“…In Patagonia in particular, the dinosaur taxonomic richness of some Cretaceous stratigraphic units and sites is considered high [e.g. 97 , 98 ]. However, in southern Patagonia, only the Chorrillo and Cerro Fortaleza formations recorded ankylosaur remains [ 10 ], and only the later peirosaurid remains.…”
The Late Cretaceous dinosaur record in southern South America has been improved recently; particularly with findings from Chorrillo and Cerro Fortaleza formations, both bearing ankylosaur remains, a clade that was not previously recorded in the Austral Basin. The dinosaur fauna of the type locality of Cerro Fortaleza Formation is known from -and biased to- large-sized sauropod remains and a single described taxon, the titanosaur Dreadnoughtus schrani. Here, we report the taxonomic composition of a site preserving thirteen isolated teeth and several osteoderms belonging to three dinosaur clades (Abelisauridae, Titanosauria, and Nodosauridae), and at least one clade of notosuchian crocodyliforms (Peirosauridae). They come from sediments positioned at the mid-section of the Cerro Fortaleza Formation, which is Campanian-Maastrichtian in age, adding valuable information to the abundance and biodiversity of this Cretaceous ecosystem. Since non-titanosaur dinosaur bones are almost absent in the locality, the teeth presented here provide a window onto the archosaur biodiversity of the Late Cretaceous in southern Patagonia. The nodosaurid tooth and small armor ossicles represent the first record of ankylosaurs for this stratigraphic unit. The peirosaurid material also represents the most austral record of the clade in South America.
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