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.
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.Read the article »
Article DOI: 10.1080/02724634.2019.1697882
Project DOI: 10.7934/P3935, http://dx.doi.org/10.7934/P3935
This project contains | Matrices |
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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
MorphoBank Project 3935
- Creation Date:
19 February 2021 - Publication Date:
19 February 2021 - Project views: 7175
- Matrix downloads: 14
Authors' Institutions
- Universidade Federal de Minas Gerais
- Museu Estadual de Rondônia
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||
MorphoBank Curator Project Administrator | 10 | 1 | 1 | 36 | 0 | 0 | 257 (257, 0, 0) | 0 | 0 | 0 | ||||
Fernando Perini Full membership | 0 | 0 | 0 | 0 | 0 | 0 | 0 (0, 0, 0) | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M27241' (10 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] Dugong dugon Last Modified in 02/19/21 | 0 | 36 | 36 | 0 | 0 | 0 | 0 | 2 |
[2] † Hydrodamalis gigas Last Modified in 02/19/21 | 1 | 35 | 35 | 0 | 0 | 0 | 0 | 2 |
[3] † Anomotherium langewieschei Last Modified in 02/19/21 | 22 | 14 | 14 | 0 | 0 | 0 | 0 | 2 |
[4] † Miosiren kocki Last Modified in 02/19/21 | 8 | 28 | 28 | 0 | 0 | 0 | 0 | 2 |
[5] † Potamosiren madgalenensis Last Modified in 02/19/21 | 26 | 10 | 10 | 0 | 0 | 0 | 0 | 2 |
[6] † Ribodon limbatus Last Modified in 02/19/21 | 26 | 10 | 10 | 0 | 0 | 0 | 0 | 2 |
[7] Trichechus manatus latirostris Last Modified in 02/19/21 | 0 | 36 | 36 | 0 | 0 | 0 | 0 | 2 |
[8] Trichechus senegalensis Last Modified in 02/19/21 | 0 | 36 | 36 | 0 | 0 | 0 | 0 | 2 |
[9] Trichechus inunguis Last Modified in 02/19/21 | 0 | 36 | 36 | 0 | 0 | 0 | 0 | 2 |
[10] † Trichechus hesperamazonicus sp. nov. Last Modified in 02/19/21 | 20 | 16 | 16 | 0 | 0 | 0 | 0 | 2 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 7175 | |
Project overview | 789 | |
Matrix views | 578 | Data matrix (97 views); Matrix landing page (481 views); |
Media views | 1745 | Media search (1476 views); M739128 (269 views); |
Bibliography | 351 | |
Taxon list | 2295 | |
Specimen list | 909 | |
Views for media list | 508 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 96 | |
Project downloads | 82 | |
Matrix downloads | 14 | Data matrix (14 downloads); |