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.
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 contains | Matrices |
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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 |
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MorphoBank Project 2545
MorphoBank Project 2545
- Creation Date:
18 October 2016 - Publication Date:
18 November 2016 - Project views: 90557
- Media downloads: 13
- Matrix downloads: 12
Authors' Institutions
- American Museum of Natural History
Members
member name | taxa | specimens | media | chars | character
| cell scorings (scored, NPA, "-") | cell
| rules | ||||||||||
Paul Velazco Project Administrator | 13 | 52 | 76 | 50 | 2 | 0 | 650 (347, 303, 0) | 0 | 32 | 214 | 266 | 0 |
Taxonomic Overview for Matrix 'M24312' (13 Taxa)
taxon | unscored cells |
scored cells |
no cell support |
NPA cells |
"-" cells | cell images | labels on cell images |
member access |
[1] † Gypsonictops hypoconus Last Modified in 10/18/16 | 0 | 27 | 24 | 23 | 0 | 2 | 2 | 1 |
[2] † Prodiacodon puercensis Last Modified in 10/18/16 | 0 | 32 | 6 | 18 | 0 | 27 | 34 | 1 |
[3] † Prodiacodon tauricinerei Last Modified in 10/20/16 | 0 | 31 | 2 | 19 | 0 | 0 | 0 | 1 |
[4] † Blacktops Last Modified in 10/18/16 | 0 | 19 | 0 | 31 | 0 | 0 | 0 | 1 |
[5] † Leptictis dakotensis Last Modified in 10/18/16 | 0 | 50 | 8 | 0 | 0 | 42 | 55 | 1 |
[6] † Megaleptictis altidens Last Modified in 10/18/16 | 0 | 33 | 0 | 17 | 0 | 0 | 0 | 1 |
[7] † Palaeictops altimontis Last Modified in 10/18/16 | 0 | 40 | 4 | 10 | 0 | 36 | 50 | 1 |
[8] † Palaeictops bicuspis Last Modified in 10/18/16 | 0 | 31 | 0 | 19 | 0 | 31 | 43 | 1 |
[9] † Palaeictops borealis Last Modified in 10/18/16 | 0 | 9 | 0 | 41 | 0 | 9 | 11 | 1 |
[10] † Palaeictops bridgeri Last Modified in 10/18/16 | 0 | 11 | 0 | 39 | 0 | 11 | 12 | 1 |
[11] † Palaeictops matthewi Last Modified in 10/18/16 | 0 | 32 | 6 | 18 | 0 | 26 | 33 | 1 |
[12] † Palaeictops multicuspis Last Modified in 10/18/16 | 0 | 15 | 0 | 35 | 0 | 15 | 18 | 1 |
[13] † Palaeictops robustus Last Modified in 10/18/16 | 0 | 17 | 2 | 33 | 0 | 15 | 8 | 1 |
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