Project 2545: P.M. Velazco, M.J. Novacek. 2016. Systematics of the genus Palaeictops Matthew, 1899 (Mammalia: Leptictidae), with the description of two new species from the Middle Eocene of Utah and Wyoming. American Museum Novitates. 3867 (3867):1–42.
Specimen: † Palaeictops altimontis (AMNH:96250)

Abstract

Palaeictops is a genus of Early Cenozoic Leptictidae, currently comprising six species known from Eocene faunas in the United States and Canada. Two new species, Palaeictops altimontis and P. robustus, are represented by nearly complete skulls and mandibles from the Tepee Trail (Middle Eocene) and Uinta (Middle Eocene) formations of Wyoming and Utah, respectively. They are similar to other species of Palaeictops in having a single sagittal crest, small suprameatal foramen, and an expanded cochlear fossula. Phylogenetic analysis recovered a monophyletic Palaeictops and a sister relationship of P. bicuspis and P. multicuspis with P. matthewi sister to this clade. The subfamily Leptictinae is herein recognized to comprise Blacktops, Leptictis, Megaleptictis, and Palaeictops. This group is distinctive in having a number of features that indicate a less sectorial cheektooth dentition than in the nonleptictine Prodiacodon and Myrmecoboides. The leptictines Palaeictops and Leptictis are also known from postcranial elements, and these show features, such as the distally fused tibia and fibula, that distinguish them from the condition in Prodiacodon. The Late Cretaceous genus Gypsonictops is used as an outgroup for the phylogenetic assessment of leptictids herein, but it remains uncertain whether this taxon has a close relationship with other leptictids or lies outside the crown group Placentalia.


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Article DOI: http://dx.doi.org/10.1206/3867.1

Project DOI: 10.7934/P2545, http://dx.doi.org/10.7934/P2545
This project containsMatrices
  • 76 Media
  • 1 Matrix
  • 1 Document
  • 13 Taxa
  • 52 Specimens
  • 50 Characters
Total size of project's media files: 228 MB

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Total scored cells: 650
Total media associated with cells: 214
Total labels associated with cell media: 266
Characters
Total characters: 50
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 103
Total character states with associated media: 2
Total character states with media with labels:2
Total unordered/ordered characters:50/0
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    Members

    member name taxa specimens media chars character
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    Paul Velazco
    Project Administrator
    Last logged in 11/18/16
    1352765020650
    (347, 303, 0)
    0322142660


    Taxonomic Overview for Matrix 'M24312' (13 Taxa)

    taxon unscored
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    [1] † Gypsonictops hypoconus
    Last Modified in 10/18/16
    0272423022none
    [2] † Prodiacodon puercensis
    Last Modified in 10/18/16
    03261802734none
    [3] † Prodiacodon tauricinerei
    Last Modified in 10/20/16
    031219000none
    [4] † Blacktops
    Last Modified in 10/18/16
    019031000none
    [5] † Leptictis dakotensis
    Last Modified in 10/18/16
    0508004255none
    [6] † Megaleptictis altidens
    Last Modified in 10/18/16
    033017000none
    [7] † Palaeictops altimontis
    Last Modified in 10/18/16
    04041003650none
    [8] † Palaeictops bicuspis
    Last Modified in 10/18/16
    03101903143none
    [9] † Palaeictops borealis
    Last Modified in 10/18/16
    090410911none
    [10] † Palaeictops bridgeri
    Last Modified in 10/18/16
    01103901112none
    [11] † Palaeictops matthewi
    Last Modified in 10/18/16
    03261802633none
    [12] † Palaeictops multicuspis
    Last Modified in 10/18/16
    01503501518none
    [13] † Palaeictops robustus
    Last Modified in 10/18/16
    0172330158none


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