Project 3933: H. P. Püschel, J. Alarcón-Muñoz, S. Soto-Acuña, R. Ugalde, S. L. Shelley, S. L. Brusatte. 2023. Anatomy and phylogeny of a new small macraucheniid (Mammalia: Litopterna) from the Bahía Inglesa Formation (late Miocene), Atacama Region, Northern Chile. Journal of Mammalian Evolution. epub ahead of print:none yet.
Abstract
We describe a new macraucheniine macraucheniid, Micrauchenia saladensis gen. et sp. nov., from the late Miocene (Huayquerian SALMA). This is the first litoptern from Bahía Inglesa Formation, Chile. The specimen includes a partial mandible, cervical and thoracic vertebrae fragments, and portions of the forelimbs (a scapula fragment, an ulna-radius fragment, seven carpals, three metapodials, two proximal phalanges and four intermediate phalanges). The postcranial anatomy of Micrauchenia saladensis is consistent with terrestrial and cursorial locomotion, which suggests an allochthonous position of this specimen within the marine Bahía Inglesa Formation. The fusion of the ulna and radius and the presence of a radial aliform expansion align Micrauchenia with other macraucheniines, with which it shares these features. We interpret the fusion of the ulna and radius as a cursorial specialization and the aliform expansion as an adaptation for strong flexion movements and to resist higher transverse stresses during locomotion. In addition, Micrauchenia saladensis is the smallest member of the subfamily Macraucheniinae. To test the systematics and phylogenetics of this specimen, we expanded previous morphological matrices of macraucheniids by adding one dental and eight postcranial characters and scoring Micrauchenia saladensis. We performed maximum parsimony and Bayesian phylogenetic analyses, the latter applied for the first time to macraucheniid phylogeny. Our analyses confirm Micrauchenia saladensis as a member of the subfamily Macraucheniinae, although with uncertain affinities within this subfamilyRead the article »
Article DOI: 10.1007/s10914-022-09646-0
Project DOI: 10.7934/P3933, http://dx.doi.org/10.7934/P3933
This project contains | Matrices |
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Download Project SDD File | Total scored cells: 503 Total media associated with cells: 0 Total labels associated with cell media: 0 |
Characters | |
Total characters: 43 Total characters with associated media: 0 Total characters with media with labels: 0 Total character states: 98 Total character states with associated media: 0 Total character states with media with labels:0 Total unordered/ordered characters:38/5 |
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MorphoBank Project 3933
MorphoBank Project 3933
- Creation Date:
18 February 2021 - Publication Date:
06 April 2023 - Project views: 2905
- Media downloads: 1
- Matrix downloads: 4
Authors' Institutions
- Universidad de Chile
- University of Edinburgh
- Kaytreng Consultores en Paleontología
- Universidad Mayor (Santiago, Chile)
Members
member name | taxa | specimens | media | media notes | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||||||||||
Hans Puschel Project Administrator | 21 | 1 | 1 | 0 | 43 | 0 | 3 | 0 | 0 | 503 (501, 0, 2) | 0 | 0 | 0 | 0 | 0 |
Taxonomic Overview for Matrix 'M27237' (21 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Tricoelodus spp. Last Modified in 04/06/23 | 26 | 17 | 17 | 0 | 0 | 0 | 0 | 1 |
[2] † Polymorphis lechei Last Modified in 04/06/23 | 25 | 18 | 18 | 0 | 0 | 0 | 0 | 1 |
[3] † Cramauchenia normalis Last Modified in 04/06/23 | 6 | 37 | 37 | 0 | 0 | 0 | 0 | 1 |
[4] † Coniopternium spp. Last Modified in 04/06/23 | 26 | 17 | 17 | 0 | 0 | 0 | 0 | 1 |
[5] † Pternoconius spp. Last Modified in 04/06/23 | 25 | 18 | 18 | 0 | 0 | 0 | 0 | 1 |
[6] † Llullataruca shockeyi Last Modified in 04/06/23 | 25 | 18 | 18 | 0 | 0 | 0 | 0 | 1 |
[7] † Theosodon spp. Last Modified in 04/06/23 | 0 | 43 | 42 | 0 | 1 | 0 | 0 | 1 |
[8] † Cullinia levis Last Modified in 04/06/23 | 26 | 18 | 17 | 0 | 0 | 0 | 0 | 1 |
[9] † Huayqueriana cristata Last Modified in 04/06/23 | 18 | 27 | 25 | 0 | 0 | 0 | 0 | 1 |
[10] † Scalabrinitherium bravardi Last Modified in 04/06/23 | 10 | 33 | 32 | 0 | 1 | 0 | 0 | 1 |
[11] † Oxyodontherium zeballosi Last Modified in 04/06/23 | 13 | 31 | 30 | 0 | 0 | 0 | 0 | 1 |
[12] † Paranauchenia denticulata Last Modified in 04/06/23 | 27 | 16 | 16 | 0 | 0 | 0 | 0 | 1 |
[13] † Paranauchenia hystata Last Modified in 04/06/23 | 31 | 12 | 12 | 0 | 0 | 0 | 0 | 1 |
[14] † Promacrauchenia antiquua Last Modified in 04/06/23 | 6 | 37 | 37 | 0 | 0 | 0 | 0 | 1 |
[15] † Promacrauchenia calchaquiorum Last Modified in 04/06/23 | 24 | 19 | 19 | 0 | 0 | 0 | 0 | 1 |
[16] † Xenorhinotherium bahiense Last Modified in 04/06/23 | 7 | 36 | 36 | 0 | 0 | 0 | 0 | 1 |
[17] † Macrauchenia patachonica Last Modified in 04/06/23 | 0 | 44 | 43 | 0 | 0 | 0 | 0 | 1 |
[18] † Macraucheniopsis ensenadensis Last Modified in 04/06/23 | 20 | 23 | 23 | 0 | 0 | 0 | 0 | 1 |
[19] † Windhausenia delacroixi Last Modified in 04/06/23 | 29 | 14 | 14 | 0 | 0 | 0 | 0 | 1 |
[20] † Promacrauchenia sp. (Anaya and Macfadden 1995) Last Modified in 08/30/22 | 28 | 15 | 15 | 0 | 0 | 0 | 0 | 1 |
[21] † Micrauchenia saladensis Last Modified in 04/06/23 | 35 | 8 | 8 | 0 | 0 | 0 | 0 | 1 |
Project views
type | number of views | Individual items viewed (where applicable) |
Total project views | 2905 | |
Project overview | 294 | |
Matrix views | 314 | Matrix landing page (295 views); Matrix of Macraucheniidae (19 views); |
Media views | 629 | Media search (530 views); M851924 (99 views); |
Taxon list | 982 | |
Bibliography | 131 | |
Specimen list | 354 | |
Views for media list | 201 |
Project downloads
type | number of downloads | Individual items downloaded (where applicable) |
Total downloads from project | 6 | |
Matrix downloads | 4 | Matrix of Macraucheniidae (4 downloads); |
Project downloads | 1 | |
Media downloads | 1 | M851924 (1 download); |