Project 2346: Shawn P. Zack, Kenneth D. Rose. 2015. The postcranial skeleton of Galecyon: evidence for morphological and locomotor diversity in early Hyaenodontidae (Mammalia, Hyaenodontida). Journal of Vertebrate Paleontology. 35 (6):e1001492.
Specimen: † Galecyon chronius (USNM/511004)
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Abstract

Hyaenodontidae is a diverse component of the carnivorous guild in early Eocene (Wasatchian) North American mammalian faunas. Although there have been suggestions that early members of the family had diverse locomotor repertoires, few Wasatchian postcrania are adequately described. Here we describe the first known postcranial remains of the rare Wasatchian hyaenodontid Galecyon, based principally on a well-preserved partial skeleton from the Willwood Formation, Wyoming. Galecyon is reconstructed as a 5.2–7.9 kg terrestrial carnivore. Small but significant differences throughout the skeleton distinguish Galecyon from Prolimnocyon. Galecyon is reconstructed as scansorial/generalized terrestrial because these postcranial differences consistently indicate a more terrestrial habit than in the scansorial Prolimnocyon. Among other hyaenodontids, Arfia shows evidence for parallel terrestrial adaptation, whereas Pyrocyon is morphologically intermediate between Galecyon and Prolimnocyon. Manipulation of the well-preserved bones forming the crurotarsal joint of Galecyon provides evidence that contradicts a previous proposal that Arfia, another Wasatchian hyaenodontid, was capable of hind foot reversal. In both genera, movements at the crurotarsal joint were largely restricted to a parasagittal plane. Phylogenetic analysis of a new postcranial character set supports a pattern of relationships for early Eocene hyaenodontids different from that supported by dental morphology. Combining the two data partitions favors most aspects of the dental topology, but the conflict between dental and postcranial data indicates that confident phylogenetic resolution can be elusive, even with relatively dense sampling.


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Article DOI: 10.1080/02724634.2014.1001492

Project DOI: 10.7934/P2346, http://dx.doi.org/10.7934/P2346
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 2 Documents
  • 23 Taxa
  • 1 Specimen
  • 144 Characters
Total size of project's media files: 1 MB

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Total scored cells: 2761
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 144
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 312
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:144/0
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MorphoBank Project 2346

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    MorphoBank Curator
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    Last logged in 10/19/16
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    Kenneth Rose
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    Shawn Zack
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    Taxonomic Overview for Matrix 'M23729' (23 Taxa)

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    [1] OUTGROUP dummy
    Last Modified in 08/09/16
    5955080003
    [2] † Protungulatum donnae
    Last Modified in 01/27/16
    54909000003
    [3] † Mithrandir gillianus
    Last Modified in 01/27/16
    3411011000003
    [4] † Didymictis spp.
    Last Modified in 01/27/16
    1313313100003
    [5] † Viverravus spp.
    Last Modified in 01/27/16
    4010610400003
    [6] † Cimolestes magnus
    Last Modified in 01/27/16
    36161080003
    [7] † Arfia gingerichi
    Last Modified in 01/27/16
    115353080003
    [8] † Arfia junnei
    Last Modified in 01/27/16
    234141080003
    [9] † Arfia shoshoniensis and opisthotoma
    Last Modified in 01/27/16
    1813512600003
    [10] † Prototomus minimus
    Last Modified in 01/27/16
    105554080003
    [11] † Prototomus deimos
    Last Modified in 01/27/16
    323232080003
    [12] † Prototomus phobos
    Last Modified in 01/27/16
    47999700003
    [13] † Prototomus secundarius
    Last Modified in 01/27/16
    115653080003
    [14] † Gazinocyon whitiae
    Last Modified in 01/27/16
    46999800003
    [15] † Prototomus martis
    Last Modified in 01/27/16
    46460080003
    [16] † Pyrocyon strenuus
    Last Modified in 01/27/16
    1913212500003
    [17] † Pyrocyon dioctetus
    Last Modified in 01/27/16
    234141080003
    [18] † Prolimnocyon haematus
    Last Modified in 01/27/16
    66158080003
    [19] † Prolimnocyon atavus
    Last Modified in 01/27/16
    714113700003
    [20] † Galecyon morloi
    Last Modified in 01/27/16
    244040080003
    [21] † Galecyon peregrinus
    Last Modified in 01/27/16
    284036080003
    [22] † Galecyon mordax
    Last Modified in 01/27/16
    74737000003
    [23] † Galecyon chronius
    Last Modified in 01/27/16
    1413413000003


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