Project 2579: T. P. Melo, A. G. Martinelli, M. B. Soares. 2017. A new gomphodont cynodont (Traversodontidae) from the Middle-Late Triassic Dinodontosaurus Assemblage Zone of the Santa Maria Supersequence, Brazil. Palaeontology. 60 (4):571-582. (In Press)
Specimen: † Scalenodon ribeiroae (UFRGS/PV:0239-T)
View: Ventral

Abstract

The tetrapod faunas from the terrestrial Middle–Late Triassic basins of Africa and South America are among the richest in the world, especially in non-mammalian cynodonts. Despite the great abundance of cynodont specimens found in these basins, there are few known taxa that exhibit interbasinal distributions. Here we describe a new species of traversodontid cynodont of the genus Scalenodon from the Triassic Dinodontosaurus Assemblage Zone of the Santa Maria Supersequence, from the state of Rio Grande do Sul, Brazil. Scalenodon ribeiroae sp. nov. is based on a partial skull that possesses a combination of features not observed in any other South American traversodontid: ellipsoid upper postcanines with the transverse crest formed by three cusps, lacking a mesiobuccal accessory cusp, and with lingual cusp projected lingually creating a concave lingual surface on the upper postcanines; the paracanine fossa is positioned medially to the upper canine, and jugal lacks a suborbital process. A phylogenetic analysis places the new taxon in a basal position within the Family Traversodontidae, with the African Scalenodon angustifrons as sister-taxon. The new specimen of Scalenodon represents the first record of this genus outside of the Manda Beds of Tanzania, and reinforces the biostratigraphical and biogeographical connection between Gondwanan Middle–Late Triassic tetrapod faunas. Although recent advances have been made, our current knowledge of these faunas is limited by the lack of absolute dates for most units and by uncertainties in the taxonomy and stratigraphical provenance of key fossils.


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Article DOI: 10.1111/pala.12302

Project DOI: 10.7934/P2579, http://dx.doi.org/10.7934/P2579
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 32 Taxa
  • 1 Specimen
  • 78 Characters
Total size of project's media files: 5 MB

Download Project SDD File
Total scored cells: 1762
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 78
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 176
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:78/0
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MorphoBank Project 2579


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Tomaz Panceri Melo
    Project Administrator
    Last logged in 06/06/17
    321178001762
    (1742, 0, 20)
    000


    Taxonomic Overview for Matrix 'M24373' (31 Taxa)

    taxon unscored
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    scored
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    no cell
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    NPA
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    "-" cellscell images labels on
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    [1] † Thrinaxodon
    Last Modified in 04/25/17
    21555502001
    [2] † Cynognathus
    Last Modified in 04/25/17
    21555502001
    [3] † Diademodon
    Last Modified in 04/25/17
    4747301001
    [4] † Beishanodon
    Last Modified in 04/25/17
    41373700001
    [5] † Cricodon
    Last Modified in 04/25/17
    26525200001
    [6] † Langbergia
    Last Modified in 04/25/17
    15636300001
    [7] † Sinognathus
    Last Modified in 04/25/17
    24545400001
    [8] † Trirachodon
    Last Modified in 04/25/17
    5777300001
    [9] JSM100
    Last Modified in 12/26/16
    36424200001
    [10] † Andescynodon
    Last Modified in 04/25/17
    8696901001
    [11] † Arctotraversodon
    Last Modified in 04/25/17
    46323200001
    [12] † Boreogomphodon jeffersoni
    Last Modified in 04/25/17
    9736900001
    [13] † Dadadon
    Last Modified in 04/25/17
    14646400001
    [14] † Exaeretodon argentinus
    Last Modified in 04/25/17
    4727202001
    [15] † Exaeretodon riograndensis
    Last Modified in 04/25/17
    11656502001
    [16] † Gomphodontosuchus
    Last Modified in 04/25/17
    31454502001
    [17] † Luangwa drysdalli
    Last Modified in 04/25/17
    8717000001
    [18] † Luangwa sudamericana
    Last Modified in 04/25/17
    23555500001
    [19] † Massetognathus ochagaviae
    Last Modified in 04/25/17
    15646300001
    [20] † Massetognathus pascuali
    Last Modified in 04/25/17
    1797700001
    [21] † Menadon
    Last Modified in 04/25/17
    9656504001
    [22] † Pascualgnathus
    Last Modified in 04/25/17
    12656501001
    [23] † Protuberum
    Last Modified in 04/25/17
    30474701001
    [24] † Santacruzodon
    Last Modified in 04/25/17
    26525200001
    [25] † Scalenodon angustifrons
    Last Modified in 04/25/17
    19605900001
    [26] † Mandagomphodon attridgei
    Last Modified in 04/25/17
    40383800001
    [27] † Mandagomphodon hirschoni
    Last Modified in 04/25/17
    19595900001
    [28] † Scalenodontoides
    Last Modified in 04/25/17
    25515102001
    [29] † Traversodon
    Last Modified in 04/25/17
    19595900001
    [30] † Nanogomphodon
    Last Modified in 04/25/17
    67111100001
    [31] UFRGS-PV-0239-T
    Last Modified in 12/26/16
    42373600001


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    Total project views5717
    Project overview717
    Bibliography204
    Matrix views563Traversodontid and gomphodont cynodonts (50 views); Matrix landing page (513 views);
    Media views1144Media search (969 views); M438343 (175 views);
    Specimen list475
    Taxon list2227
    Views for media list387




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    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project94
    Project downloads69
    Matrix downloads25Traversodontid and gomphodont cynodonts (25 downloads);