An Unusual New Theropod with a Didactyl Manus from the Upper Cretaceous of Patagonia, Argentina
Publication Date
July 13, 2016
Journal
PLOS ONE
Authors
Sebastián Apesteguía, Nathan D. Smith, Rubén Juárez Valieri & Peter J. Makovicky
Volume
11
Issue
7
Pages
e0157793
DOI
https://dx.plos.org/10.1371/journal.pone.0157793
Publisher URL
http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0157793
Scopus
84979021072
Mendeley
http://www.mendeley.com/research/unusual-new-theropod-didactyl-manus-upper-cretaceous-patagonia-argentina
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{"title"=>"An unusual new theropod with a didactyl manus from the upper cretaceous of patagonia, Argentina", "type"=>"journal", "authors"=>[{"first_name"=>"Sebastián", "last_name"=>"Apesteguía", "scopus_author_id"=>"56061877700"}, {"first_name"=>"Nathan D.", "last_name"=>"Smith", "scopus_author_id"=>"8271678900"}, {"first_name"=>"Rubén Juárez", "last_name"=>"Valieri", "scopus_author_id"=>"56667764700"}, {"first_name"=>"Peter J.", "last_name"=>"Makovicky", "scopus_author_id"=>"6602833785"}], "year"=>2016, "source"=>"PLoS ONE", "identifiers"=>{"pui"=>"611244982", "sgr"=>"84979021072", "issn"=>"19326203", "arxiv"=>"arXiv:1011.1669v3", "pmid"=>"12301371", "scopus"=>"2-s2.0-84979021072", "doi"=>"10.1371/journal.pone.0157793", "isbn"=>"1512291420"}, "id"=>"4984ded3-b3aa-382b-bdfe-ca989180f608", "abstract"=>"Background Late Cretaceous terrestrial strata of the Neuquén Basin, northern Patagonia, Argentina have yielded a rich fauna of dinosaurs and other vertebrates. The diversity of saurischian dinosaurs is particularly high, especially in the late Cenomanian-early Turonian Huincul Formation, which has yielded specimens of rebacchisaurid and titanosaurian sauropods, and abelisaurid and carcharodontosaurid theropods. Continued sampling is adding to the known vertebrate diversity of this unit. Methodology/ Principal Findings A new, partially articulated mid-sized theropod was found in rocks from the Huincul Formation. It exhibits a unique combination of traits that distinguish it from other known theropods justifying erection of a new taxon, Gualicho shinyae gen. et sp. nov. Gualicho possesses a didactyl manus with the third digit reduced to a metacarpal splint reminiscent of tyrannosaurids, but both phylogenetic and multivariate analyses indicate that didactyly is convergent in these groups. Derived characters of the scapula, femur, and fibula supports the new theropod as the sister taxon of the nearly coeval African theropod Deltadromeus and as a neovenatorid carcharodontosaurian. A number of these features are independently present in ceratosaurs, and Gualicho exhibits an unusual mosaic of ceratosaurian and tetanuran synapomorphies distributed throughout the skeleton. Conclusions/ Significance Gualicho shinyae gen. et sp. nov. increases the known theropod diversity of the Huincul Formation and also represents the first likely neovenatorid from this unit. It is the most basal tetatanuran to exhibit common patterns of digit III reduction that evolved independently in a number of other tetanuran lineages. A close relationship with Deltadromaeus from the Kem Kem beds of Niger adds to the already considerable biogeographic similarity between the Huincul Formation and coeval rock units in North Africa.", "link"=>"http://www.mendeley.com/research/unusual-new-theropod-didactyl-manus-upper-cretaceous-patagonia-argentina", "reader_count"=>74, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Librarian"=>1, "Researcher"=>10, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>1, "Other"=>6, "Student > Master"=>14, "Student > Bachelor"=>28, "Lecturer"=>1, "Professor"=>1}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>1, "Librarian"=>1, "Researcher"=>10, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>9, "Student > Postgraduate"=>1, "Other"=>6, "Student > Master"=>14, "Student > Bachelor"=>28, "Lecturer"=>1, "Professor"=>1}, "reader_count_by_subject_area"=>{"Unspecified"=>2, "Engineering"=>9, "Biochemistry, Genetics and Molecular Biology"=>2, "Mathematics"=>1, "Agricultural and Biological Sciences"=>12, "Medicine and Dentistry"=>2, "Physics and Astronomy"=>2, "Social Sciences"=>3, "Computer Science"=>25, "Earth and Planetary Sciences"=>15, "Economics, Econometrics and Finance"=>1}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>9}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>2}, "Social Sciences"=>{"Social Sciences"=>3}, "Physics and Astronomy"=>{"Physics and Astronomy"=>2}, "Earth and Planetary Sciences"=>{"Earth and Planetary Sciences"=>15}, "Economics, Econometrics and Finance"=>{"Economics, Econometrics and Finance"=>1}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>12}, "Computer Science"=>{"Computer Science"=>25}, "Biochemistry, Genetics and Molecular Biology"=>{"Biochemistry, Genetics and Molecular Biology"=>2}, "Mathematics"=>{"Mathematics"=>1}, "Unspecified"=>{"Unspecified"=>2}}, "reader_count_by_country"=>{"Sweden"=>1, "United States"=>1, "Japan"=>1, "Mexico"=>1, "United Kingdom"=>1, "Portugal"=>1}, "group_count"=>0}

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