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)


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,
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
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


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

    Taxonomic Overview for Matrix 'M24312' (13 Taxa)

    taxon unscored
    no cell
    "-" cellscell images labels on
    cell images
    [1] † Gypsonictops hypoconus
    Last Modified in 10/18/16
    [2] † Prodiacodon puercensis
    Last Modified in 10/18/16
    [3] † Prodiacodon tauricinerei
    Last Modified in 10/20/16
    [4] † Blacktops
    Last Modified in 10/18/16
    [5] † Leptictis dakotensis
    Last Modified in 10/18/16
    [6] † Megaleptictis altidens
    Last Modified in 10/18/16
    [7] † Palaeictops altimontis
    Last Modified in 10/18/16
    [8] † Palaeictops bicuspis
    Last Modified in 10/18/16
    [9] † Palaeictops borealis
    Last Modified in 10/18/16
    [10] † Palaeictops bridgeri
    Last Modified in 10/18/16
    [11] † Palaeictops matthewi
    Last Modified in 10/18/16
    [12] † Palaeictops multicuspis
    Last Modified in 10/18/16
    [13] † Palaeictops robustus
    Last Modified in 10/18/16

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views56319
    Project overview2640
    Specimen list12783
    Taxon list3865
    Documents list939
    Views for media list4879
    Media views27281Media search (3012 views); M432021 (367 views); M432030 (366 views); M432038 (358 views); M432067 (349 views); M432068 (337 views); M432071 (383 views); M432072 (325 views); M432074 (341 views); M432075 (340 views); M432078 (317 views); M432081 (336 views); M432082 (354 views); M432084 (361 views); M432085 (326 views); M432086 (365 views); M432087 (322 views); M432089 (351 views); M432090 (317 views); M432094 (351 views); M432095 (358 views); M432096 (324 views); M432102 (354 views); M432103 (337 views); M432104 (382 views); M432107 (350 views); M432108 (308 views); M432109 (337 views); M432115 (323 views); M432116 (332 views); M432117 (332 views); M432121 (324 views); M432123 (364 views); M432124 (362 views); M432125 (317 views); M432129 (308 views); M432130 (335 views); M432131 (319 views); M432136 (349 views); M432138 (328 views); M432142 (288 views); M432143 (283 views); M432150 (342 views); M432153 (302 views); M432155 (291 views); M432157 (291 views); M432158 (283 views); M432159 (326 views); M432161 (311 views); M432164 (290 views); M432166 (294 views); M432167 (270 views); M432171 (290 views); M432176 (258 views); M432177 (293 views); M432178 (299 views); M432198 (312 views); M432214 (288 views); M432215 (308 views); M432217 (303 views); M432220 (304 views); M432224 (282 views); M432226 (259 views); M432227 (293 views); M432252 (325 views); M432253 (280 views); M432254 (309 views); M432256 (300 views); M432259 (277 views); M432262 (295 views); M432268 (324 views); M432276 (296 views); M432350 (272 views); M432361 (309 views); M432392 (297 views); M432404 (272 views); M432139 (344 views);
    Matrix views1423Matrix landing page (1283 views); Palaeictops systematics (140 views);

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project188
    Project downloads179
    Matrix downloads2Palaeictops systematics (2 downloads);
    Media downloads7M432226 (1 download); M432198 (2 downloads); M432224 (1 download); M432109 (1 download); M432117 (1 download); M432123 (1 download);