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 , 2015 (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.


Read the article »

Article DOI: 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: 212.25M

Download Project SDD File
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:0
Total unordered/ordered characters:50/0
Currently Viewing:
MorphoBank Project 2545

    Authors' Institutions

    • American Museum of Natural History



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    comms
        
    notes  medialabels
    rules
    Paul Velazco
    Project Administrator
    1352765020650
    (347, 303, 0)
    0322142660


    Taxonomic Overview for Matrix 'M24312' (13 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [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


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views51062
    Project overview2482
    Specimen list11321
    Taxon list3601
    Bibliography2257
    Documents list878
    Views for media list4375
    Media views24802Media search (2719 views); M432021 (334 views); M432030 (332 views); M432038 (327 views); M432067 (318 views); M432068 (298 views); M432071 (348 views); M432072 (293 views); M432074 (310 views); M432075 (309 views); M432078 (285 views); M432081 (310 views); M432082 (324 views); M432084 (329 views); M432085 (293 views); M432086 (325 views); M432087 (289 views); M432089 (322 views); M432090 (288 views); M432094 (318 views); M432095 (326 views); M432096 (294 views); M432102 (322 views); M432103 (304 views); M432104 (348 views); M432107 (320 views); M432108 (279 views); M432109 (308 views); M432115 (294 views); M432116 (300 views); M432117 (303 views); M432121 (292 views); M432123 (336 views); M432124 (324 views); M432125 (287 views); M432129 (279 views); M432130 (299 views); M432131 (290 views); M432136 (301 views); M432138 (298 views); M432142 (263 views); M432143 (254 views); M432150 (315 views); M432153 (278 views); M432155 (264 views); M432157 (263 views); M432158 (258 views); M432159 (297 views); M432161 (287 views); M432164 (266 views); M432166 (271 views); M432167 (247 views); M432171 (264 views); M432176 (236 views); M432177 (267 views); M432178 (274 views); M432198 (286 views); M432214 (262 views); M432215 (284 views); M432217 (278 views); M432220 (278 views); M432224 (255 views); M432226 (236 views); M432227 (266 views); M432252 (301 views); M432253 (254 views); M432254 (287 views); M432256 (275 views); M432259 (254 views); M432262 (267 views); M432268 (299 views); M432276 (273 views); M432350 (249 views); M432361 (285 views); M432392 (273 views); M432404 (249 views); M432139 (312 views);
    Matrix views1346Matrix landing page (1216 views); Palaeictops systematics (130 views);




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project168
    Project downloads159
    Matrix downloads2Palaeictops systematics (2 downloads);
    Media downloads7M432226 (1 download); M432198 (2 downloads); M432224 (1 download); M432109 (1 download); M432117 (1 download); M432123 (1 download);