Project 3935: F. A. Perini, E. R. Nascimento, M. A. Cozzuol. 2019. A new species of Trichechus Linnaeus, 1758 (Sirenia, Trichechidae), from the upper Pleistocene of southwestern Amazonia, and the evolution of Amazonian manatees. Journal of Vertebrate Paleontology. 39 (5):e1697882.
Specimen: Trichechus manatus latirostris (unvouchered)
View: mother and calf

Abstract

The genus Trichechus (Mammalia, Sirenia, Trichechidae) harbors a modest diversity, comprising only three living species of manatees, and no species currently recognized as fossil. Herein, we report a new extinct species of manatee from the late Pleistocene of the Brazilian Amazonia, Trichechus hesperamazonicus, sp. nov. It comes from the alluvial deposits of the Rio Madeira Formation along the Madeira River, state of Rondônia, western Brazil, and is represented by a partial palate with both molar series and two partial right dentaries. The new taxon shows a mosaic of characteristics resembling those of other manatee species, as well as some unique characters. It differs from all other Trichechus species by possessing a wide space between the posterior lower tooth row and ascending ramus of dentary, and by having the anterior border of the ascending ramus covering the posterior end of the tooth row in lateral view. The results of morphometric analyses (principal component analysis and discriminant analysis) further support the distinctiveness of the new species. A phylogenetic analysis recovers the new species in a polytomy with T. inunguis and the clade formed by T. senegalensis and T. manatus. The levels from which the remains were recovered produced a radiocarbon date of 44,710 ± 880 years before present; together with molecular clock estimates, this date suggests that until recently at least two species of manatees coexisted in the fluvial systems of western Amazonia.


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Article DOI: 10.1080/02724634.2019.1697882

Project DOI: 10.7934/P3935, http://dx.doi.org/10.7934/P3935
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 10 Taxa
  • 1 Specimen
  • 36 Characters
Total size of project's media files: 111.72k

Download Project SDD File
Total scored cells: 257
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 36
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 97
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:36/0
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MorphoBank Project 3935

    Authors' Institutions

    • Universidade Federal de Minas Gerais

    • Museu Estadual de Rondônia



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    MorphoBank Curator
    Project Administrator
    10113600257
    (257, 0, 0)
    000
    Fernando Perini
    Full membership
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M27241' (10 Taxa)

    taxon unscored
    cells
    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] Dugong dugon
    Last Modified in 02/19/21
    0363600002
    [2] † Hydrodamalis gigas
    Last Modified in 02/19/21
    1353500002
    [3] † Anomotherium langewieschei
    Last Modified in 02/19/21
    22141400002
    [4] † Miosiren kocki
    Last Modified in 02/19/21
    8282800002
    [5] † Potamosiren madgalenensis
    Last Modified in 02/19/21
    26101000002
    [6] † Ribodon limbatus
    Last Modified in 02/19/21
    26101000002
    [7] Trichechus manatus latirostris
    Last Modified in 02/19/21
    0363600002
    [8] Trichechus senegalensis
    Last Modified in 02/19/21
    0363600002
    [9] Trichechus inunguis
    Last Modified in 02/19/21
    0363600002
    [10] † Trichechus hesperamazonicus sp. nov.
    Last Modified in 02/19/21
    20161600002


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    Taxon list580
    Specimen list216
    Views for media list134




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