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.


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:2
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
    Last logged in 11/18/16
    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 views41383
    Project overview2204
    Specimen list8510
    Taxon list3075
    Bibliography1834
    Documents list772
    Views for media list3453
    Media views20340Media search (2238 views); M432021 (277 views); M432030 (280 views); M432038 (266 views); M432067 (261 views); M432068 (240 views); M432071 (290 views); M432072 (238 views); M432074 (253 views); M432075 (249 views); M432078 (234 views); M432081 (257 views); M432082 (262 views); M432084 (273 views); M432085 (236 views); M432086 (266 views); M432087 (229 views); M432089 (267 views); M432090 (234 views); M432094 (257 views); M432095 (266 views); M432096 (233 views); M432102 (263 views); M432103 (245 views); M432104 (249 views); M432107 (266 views); M432108 (226 views); M432109 (254 views); M432115 (234 views); M432116 (243 views); M432117 (249 views); M432121 (235 views); M432123 (282 views); M432124 (264 views); M432125 (234 views); M432129 (223 views); M432130 (231 views); M432131 (231 views); M432136 (244 views); M432138 (242 views); M432142 (215 views); M432143 (204 views); M432150 (270 views); M432153 (233 views); M432155 (212 views); M432157 (218 views); M432158 (209 views); M432159 (248 views); M432161 (242 views); M432164 (221 views); M432166 (224 views); M432167 (204 views); M432171 (219 views); M432176 (194 views); M432177 (220 views); M432178 (230 views); M432198 (237 views); M432214 (218 views); M432215 (243 views); M432217 (233 views); M432220 (234 views); M432224 (211 views); M432226 (191 views); M432227 (219 views); M432252 (257 views); M432253 (210 views); M432254 (243 views); M432256 (227 views); M432259 (207 views); M432262 (218 views); M432268 (254 views); M432276 (229 views); M432350 (204 views); M432361 (241 views); M432392 (222 views); M432404 (202 views); M432139 (256 views);
    Matrix views1195Matrix landing page (1091 views); Palaeictops systematics (104 views);




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project134
    Project downloads125
    Matrix downloads2Palaeictops systematics (2 downloads);
    Media downloads7M432226 (1 download); M432198 (2 downloads); M432224 (1 download); M432109 (1 download); M432117 (1 download); M432123 (1 download);