Project 3822: M. C. Lamanna, G. A. Casal, R. D. F. MartĂ­nez, L. M. Ibiricu. 2020. Megaraptorid (Theropoda: Tetanurae) partial skeletons from the Upper Cretaceous Bajo Barreal Formation of central Patagonia, Argentina: implications for the evolution of large body size in Gondwanan megaraptorans. Annals of Carnegie Museum. (In Press)
Specimen: † UNPSJB-PV 944 & 958 (UNPSJB/PV:944 & 958)
View: Right lateral

Abstract

We describe two partial postcranial skeletons belonging to the enigmatic theropod dinosaur clade Megaraptoridae from the Upper Cretaceous (lower Cenomanian–upper Turonian) Bajo Barreal Formation of southern Chubut Province, central Patagonia, Argentina. The specimens are assigned to Megaraptoridae due to their possession of multiple anatomical features that are considered synapomorphies of that predatory dinosaur group, such as a greatly enlarged, laterally compressed ungual of manual digit I that possesses asymmetrical lateral and medial vascular grooves. Overlapping elements of the two skeletons are nearly identical in morphology, suggesting that they probably represent the same taxon, a large-bodied theropod that was previously unknown from the early Late Cretaceous of southern South America. The Bajo Barreal specimens constitute the most ancient unquestionable records of Megaraptoridae from that continent, and exhibit particularly strong osteological resemblances to penecontemporaneous megaraptorids from the Winton Formation of Australia. Phylogenetic analysis recovers the unnamed Bajo Barreal taxon as the earliest-diverging South American megaraptorid and the oldest-known representative of this clade that likely attained a body length of at least seven meters and a mass of at least one metric ton. Overall, the balance of the evidence suggests that megaraptorids originated in eastern Gondwana (Australia) during the Early Cretaceous, then subsequently dispersed to western Gondwana (South America) during the mid-Cretaceous, where they attained substantially larger body sizes, ultimately coming to occupy the apex predator niches in their respective habitats.


Project DOI: 10.7934/P3822, http://dx.doi.org/10.7934/P3822
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 3 Documents
  • 57 Taxa
  • 1 Specimen
  • 351 Characters
Total size of project's media files: 15.48M

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Total scored cells: 8580
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 351
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 801
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:317/34
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MorphoBank Project 3822

    Authors' Institutions

    • Carnegie Museum of Natural History



    Members

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    Matthew Lamanna
    Project Administrator
    Last logged in 11/23/20
    5711035100008580
    (8538, 0, 42)
    00000


    Taxonomic Overview for Matrix 'M26964' (56 Taxa)

    taxon unscored
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    [1] † Ceratosaurus
    Last Modified in 11/07/20
    5429729601001
    [2] † Allosaurus
    Last Modified in 11/07/20
    134934802001
    [3] † Monolophosaurus
    Last Modified in 11/07/20
    16618418401001
    [4] † Piatnitzkysaurus
    Last Modified in 11/07/20
    20015115100001
    [5] † Sinraptor
    Last Modified in 11/07/20
    5130030000001
    [6] † Acrocanthosaurus
    Last Modified in 11/07/20
    5329829701001
    [7] † Afrovenator
    Last Modified in 11/07/20
    18516516501001
    [8] † Torvosaurus
    Last Modified in 11/07/20
    14820220201001
    [9] † Megalosaurus
    Last Modified in 11/07/20
    21213913900001
    [10] † Baryonyx
    Last Modified in 11/07/20
    17217917900001
    [11] † Carcharodontosaurus iguidensis
    Last Modified in 11/07/20
    311404000001
    [12] † Carcharodontosaurus saharicus
    Last Modified in 11/07/20
    22412412403001
    [13] † Giganotosaurus
    Last Modified in 11/07/20
    14520320303001
    [14] † Mapusaurus
    Last Modified in 11/07/20
    16818018003001
    [15] † Suchomimus
    Last Modified in 11/07/20
    21213913900001
    [16] † Tyrannotitan
    Last Modified in 11/07/20
    275767600001
    [17] † Shaochilong
    Last Modified in 11/07/20
    299525200001
    [18] † Concavenator
    Last Modified in 11/07/20
    23311811800001
    [19] † Spinosaurus
    Last Modified in 11/07/20
    297545400001
    [20] † Irritator
    Last Modified in 11/07/20
    262898900001
    [21] † Australovenator
    Last Modified in 11/07/20
    24710410400001
    [22] † Aerosteon
    Last Modified in 11/07/20
    24011111100001
    [23] † Neovenator
    Last Modified in 11/07/20
    19216015900001
    [24] † Orkoraptor
    Last Modified in 11/07/20
    327242400001
    [25] † Fukuiraptor
    Last Modified in 11/07/20
    260929100001
    [26] † Eotyrannus
    Last Modified in 11/07/20
    287656400001
    [27] † Tanycolagreus
    Last Modified in 11/07/20
    17717317301001
    [28] † Velociraptor
    Last Modified in 11/07/20
    2332532503001
    [29] † Tyrannosaurus
    Last Modified in 11/07/20
    1133633604001
    [30] † Compsognathus
    Last Modified in 11/07/20
    10424524502001
    [31] † Sinosauropteryx
    Last Modified in 11/07/20
    15519419402001
    [32] † Guanlong
    Last Modified in 11/07/20
    8326826800001
    [33] † Ornithomimus
    Last Modified in 11/07/20
    3731231202001
    [34] † Sinornithomimus
    Last Modified in 11/07/20
    5429529502001
    [35] † Caudipteryx
    Last Modified in 11/07/20
    8326626602001
    [36] † Dilong
    Last Modified in 11/07/20
    14620420401001
    [37] † Chilantaisaurus
    Last Modified in 11/07/20
    293585800001
    [38] † Xiongguanlong
    Last Modified in 11/07/20
    20914214200001
    [39] † Kileskus
    Last Modified in 11/07/20
    314373700001
    [40] † Proceratosaurus
    Last Modified in 11/07/20
    266858500001
    [41] † Appalachiosaurus
    Last Modified in 11/07/20
    25010110100001
    [42] † Albertosaurus
    Last Modified in 11/07/20
    9125925703001
    [43] † Santanaraptor
    Last Modified in 11/07/20
    297545400001
    [44] † Eocarcharia
    Last Modified in 11/07/20
    320313100001
    [45] † Megaraptor
    Last Modified in 11/07/20
    17717617400001
    [46] † Gualicho
    Last Modified in 11/07/20
    2521019702001
    [47] † Alioramus
    Last Modified in 11/07/20
    13022022001001
    [48] † Murusraptor
    Last Modified in 11/07/20
    22113013000001
    [49] † Coelurus
    Last Modified in 11/07/20
    263888800001
    [50] † Ornitholestes
    Last Modified in 11/07/20
    21114014000001
    [51] † Zuolong
    Last Modified in 11/07/20
    258939300001
    [52] † Nqwebasaurus
    Last Modified in 11/07/20
    24810310300001
    [53] † Aorun
    Last Modified in 11/07/20
    20914114101001
    [54] † Tratayenia
    Last Modified in 11/07/20
    330212100001
    [55] † LRF 100-106
    Last Modified in 11/07/20
    331202000001
    [56] † UNPSJB-PV 944 & 958
    Last Modified in 11/07/20
    326252500001


    Project views

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    Total project views260
    Project overview46
    Documents list16
    Matrix views29Megaraptorid (Theropoda: Tetanurae) partial skeletons from the Upper Cretaceous Bajo Barreal Formation of central Patagonia, Argentina: implications for the evolution of large body size in Gondwanan megaraptorans (12 views); Matrix landing page (17 views);
    Media views50Media search (39 views); M693917 (11 views);
    Bibliography6
    Taxon list86
    Views for media list9
    Specimen list18




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project10
    Project downloads5
    Matrix downloads1Megaraptorid (Theropoda: Tetanurae) partial skeletons from the Upper Cretaceous Bajo Barreal Formation of central Patagonia, Argentina: implications for the evolution of large body size in Gondwanan megaraptorans (1 download);
    Document downloads3Supplementary Appendix B (1 download); Supplementary Appendix A (1 download); Supplementary Appendix C (1 download);
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