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
    02724230221
    [2] † Prodiacodon puercensis
    Last Modified in 10/18/16
    032618027341
    [3] † Prodiacodon tauricinerei
    Last Modified in 10/20/16
    0312190001
    [4] † Blacktops
    Last Modified in 10/18/16
    0190310001
    [5] † Leptictis dakotensis
    Last Modified in 10/18/16
    05080042551
    [6] † Megaleptictis altidens
    Last Modified in 10/18/16
    0330170001
    [7] † Palaeictops altimontis
    Last Modified in 10/18/16
    040410036501
    [8] † Palaeictops bicuspis
    Last Modified in 10/18/16
    031019031431
    [9] † Palaeictops borealis
    Last Modified in 10/18/16
    0904109111
    [10] † Palaeictops bridgeri
    Last Modified in 10/18/16
    011039011121
    [11] † Palaeictops matthewi
    Last Modified in 10/18/16
    032618026331
    [12] † Palaeictops multicuspis
    Last Modified in 10/18/16
    015035015181
    [13] † Palaeictops robustus
    Last Modified in 10/18/16
    01723301581


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views93834
    Project overview3441
    Specimen list23484
    Taxon list5692
    Bibliography4026
    Documents list1365
    Views for media list8528
    Media views45369Media search (4464 views); M432021 (583 views); M432030 (607 views); M432038 (607 views); M432067 (564 views); M432068 (572 views); M432071 (609 views); M432072 (573 views); M432074 (582 views); M432075 (571 views); M432078 (560 views); M432081 (559 views); M432082 (592 views); M432084 (591 views); M432085 (545 views); M432086 (592 views); M432087 (556 views); M432089 (621 views); M432090 (548 views); M432094 (550 views); M432095 (605 views); M432096 (550 views); M432102 (586 views); M432103 (567 views); M432104 (637 views); M432107 (568 views); M432108 (541 views); M432109 (581 views); M432115 (546 views); M432116 (568 views); M432117 (551 views); M432121 (559 views); M432123 (580 views); M432124 (597 views); M432125 (558 views); M432129 (536 views); M432130 (590 views); M432131 (542 views); M432136 (608 views); M432138 (572 views); M432142 (496 views); M432143 (512 views); M432150 (549 views); M432153 (531 views); M432155 (526 views); M432157 (525 views); M432158 (517 views); M432159 (546 views); M432161 (529 views); M432164 (484 views); M432166 (502 views); M432167 (442 views); M432171 (504 views); M432176 (465 views); M432177 (488 views); M432178 (491 views); M432198 (498 views); M432214 (475 views); M432215 (494 views); M432217 (506 views); M432220 (484 views); M432224 (479 views); M432226 (462 views); M432227 (486 views); M432252 (508 views); M432253 (481 views); M432254 (507 views); M432256 (489 views); M432259 (462 views); M432262 (492 views); M432268 (518 views); M432276 (497 views); M432350 (473 views); M432361 (496 views); M432392 (511 views); M432404 (466 views); M432139 (590 views);
    Matrix views1929Matrix landing page (1711 views); Palaeictops systematics (218 views);




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project243
    Project downloads215
    Matrix downloads15Palaeictops systematics (15 downloads);
    Media downloads13M432226 (1 download); M432198 (2 downloads); M432224 (1 download); M432109 (1 download); M432117 (1 download); M432123 (2 downloads); M432150 (1 download); M432121 (1 download); M432124 (1 download); M432102 (1 download); M432125 (1 download);