Project 3275: M. V. Sinitsa. 2018. Phylogenetic position of Sinotamias and the early evolution of Marmotini (Rodentia, Sciuridae, Xerinae). Journal of Vertebrate Paleontology. 38 (1):e1419251.
Specimen: Ammospermophilus leucurus (unvouchered)
View: whole animal

Abstract

Reexamination of Sciurotamias gromovi from the upper Miocene of Ukraine stimulated revision of Sinotamias, a problematic Neogene sciurid of uncertain affinities and previously documented only from the middle-upper Miocene of Asia. A reanalysis of the Ukrainian material and other morphologically similar taxa shows Sinotamias to be a member of the xerine tribe Marmotini. Sciurotamias gromovi and Tamias atsali are shown to be members of Sinotamias. Tamias anatoliensis from the upper Miocene of Turkey is a junior subjective synonym of Sinotamias primitivus. Sinotamias minutus and Sinotamias maximus are excluded from the genus. The latter species is referred to Kherem. Prospermophilus is synonymized with Sinotamias. Phylogenetic analysis of 23 xerine genera using 66 craniodental characters places Sinotamias among the basal Marmotina as a sister group to the living members of the subtribe. The species of the genus are united by obliquely striated lower incisors, posteriorly expanded metaconules of M1–2, and posteriorly tapered ectolophid of m1–2. The late Oligocene–early Miocene Asian genus Plesiosciurus, previously classified in the sciurid subfamily Sciurinae, is instead a member of the Marmotini and is recovered as the sister taxon to Miospermophilus and Sinotamias. The genera Ammospermophilus, Cynomys, Marmota, Miospermophilus, Paenemarmota, Plesiosciurus, Sinotamias, and Spermophilus s.l. form a monophyletic subtribe Marmotina, supported by the absence of the mesoconid in m1–3. Miospermophilus is identified as the basal-most member of this group of genera, suggesting a Nearctic origin for the Marmotina. Sinotamias, considered to be a descendant of Plesiosciurus, appears to have originated in Asia and entered Europe around 8.5 Ma.


Read the article »

Article DOI: 10.1080/02724634.2017.1419251

Project DOI: 10.7934/P3275, http://dx.doi.org/10.7934/P3275
This project contains
  • 1 Media
  • 2 Documents
  • 2 Taxa
  • 1 Specimen
Total size of project's media files: 102.41k

Download Project SDD File
Currently Viewing:
MorphoBank Project 3275
  • Creation Date:
    28 September 2018
  • Publication Date:
    09 November 2018
  • Project views: 6556

    Authors' Institutions

    • Ural Federal University



    Members

    member name taxa specimens media
    MorphoBank Curator
    Project Administrator
    211


    Project has no matrices defined.



    Project views

    type number of views Individual items viewed (where applicable)
    Total project views6556
    Project overview874
    Documents list512
    Media views2023Media search (1685 views); M594793 (338 views);
    Taxon list1291
    Specimen list923
    Views for media list558
    Bibliography375




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project159
    Project downloads158
    Document downloads1Data matrix in csv format (1 download);