Project 741: D. Pol,O. W. M. Rauhut. 2012. A Middle Jurassic abelisaurid from Patagonia and the early diversification of theropod dinosaurs. Proceedings of the Royal Society B: Biological Sciences.
Specimen: † Eoabelisaurus (MPEF/PV:3990)

Abstract

Abelisaurids are a clade of large, bizarre predatory dinosaurs, most notable for their high, short skulls and extremely reduced forelimbs. They were common in Gondwana during the Cretaceous, but exceedingly rare in the Northern Hemisphere. The oldest definitive abelisaurids so far come from the late Early Cretaceous of South America and Africa, and the early evolutionary history of the clade is still poorly known. Here, we report a new abelisaurid from the Middle Jurassic of Patagonia, Eoabelisaurus mefi gen. et sp. nov., which predates the so far oldest known secure member of this lineage by more than 40 Myr. The almost complete skeleton reveals the earliest evolutionary stages of the distinctive features of abelisaurids, such as the modification of the forelimb, which started with a reduction of the distal elements. The find underlines the explosive radiation of theropod dinosaurs in the Middle Jurassic and indicates an unexpected diversity of ceratosaurs at that time. The apparent endemism of abelisauroids to southern Gondwana during Pangean times might be due to the presence of a large, central Gondwanan desert. This indicates that, apart from continent-scale geography, aspects such as regional geography and climate are important to reconstruct the biogeographical history of Mesozoic vertebrates.


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Project DOI: 10.7934/P741, http://dx.doi.org/10.7934/P741
This project containsMatrices
  • 3 Media
  • 1 Matrix
  • 1 Document
  • 27 Taxa
  • 1 Specimen
  • 206 Characters
Total size of project's media files: 6 MB

Download Project SDD File
Total scored cells: 2307
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 206
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 427
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:206/0
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MorphoBank Project 741


    Members

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    media
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    cell scorings
    (scored, NPA, "-")
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    MorphoBank Curator
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    Last logged in 11/09/12
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    Maureen Admin
    Full membership
    Last logged in 11/09/12
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    Diego Pol
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    Oliver Rauhut
    Full membership
    Last logged in 10/10/12
    2713206002307
    (2301, 0, 6)
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    Taxonomic Overview for Matrix 'M1693' (27 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
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    [1] † Herrerasaurus
    Last Modified in 12/05/13
    320420201004
    [2] † Syntarsus
    Last Modified in 12/05/13
    220520400004
    [3] † Allosaurus
    Last Modified in 12/05/13
    020620501004
    [4] † Abelisaurus
    Last Modified in 12/05/13
    141656500004
    [5] † Aucasaurus
    Last Modified in 12/05/13
    136717000004
    [6] † Berberosaurus
    Last Modified in 12/05/13
    181282500004
    [7] † Carnotaurus
    Last Modified in 12/05/13
    3017617600004
    [8] † Ceratosaurus
    Last Modified in 12/05/13
    1019919600004
    [9] † Deltadromeus
    Last Modified in 12/05/13
    176303000004
    [10] † Ekrixinatosaurus
    Last Modified in 12/05/13
    138696800004
    [11] † Elaphrosaurus
    Last Modified in 12/05/13
    125838100004
    [12] † Eoabelisaurus
    Last Modified in 12/05/13
    7513613001004
    [13] † Genusaurus
    Last Modified in 12/05/13
    190171600004
    [14] † Genyodectes
    Last Modified in 12/05/13
    193141300004
    [15] † Ilokelesia
    Last Modified in 12/05/13
    163434300004
    [16] † Indosaurus
    Last Modified in 12/05/13
    194121200004
    [17] † Kryptops
    Last Modified in 12/05/13
    190171600004
    [18] † Laevisuchus
    Last Modified in 12/05/13
    194121200004
    [19] † Limusaurus
    Last Modified in 12/05/13
    10110910203004
    [20] † Majungasaurus
    Last Modified in 12/05/13
    2218518400004
    [21] † Masiakasaurus
    Last Modified in 12/05/13
    5215415400004
    [22] † Noasaurus
    Last Modified in 12/05/13
    169383700004
    [23] † Rajasaurus
    Last Modified in 12/05/13
    142646400004
    [24] † Rugops
    Last Modified in 12/05/13
    164434200004
    [25] † Skorpiovenator
    Last Modified in 12/05/13
    129787700004
    [26] † Spinostropheus
    Last Modified in 12/05/13
    173333300004
    [27] † Velocisaurus
    Last Modified in 12/05/13
    196101000004


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views22268
    Project overview2327
    Matrix views1781Matrix landing page (1608 views); Matrix from Pol & Rauhut 2012 (173 views);
    Media views5298Media search (3337 views); M109731 (504 views); M109730 (749 views); M109729 (708 views);
    Specimen list2016
    Taxon list8574
    Bibliography768
    Documents list1504




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project179
    Media downloads6M109731 (1 download); M109730 (5 downloads);
    Document downloads1Matrix from Pol & Rauhut 2012 (matrix 1693) (1 download);
    Matrix downloads11Matrix from Pol & Rauhut 2012 (11 downloads);
    Project downloads161