Project 4168: J. J. Calede, Y. T. Tse, K. D. Cairns. 2022. The first evidence of Heosminthus from North America and the phylogenetics of Sminthidae (Mammalia, Rodentia, Dipodoidea): biogeographical implications. Journal of Systematic Palaeontology. 20 (1):null.
Specimen: † Heosminthus teredens (UMPC:2247)
View: maxilla teeth

Abstract

The Eurasian fossil record is rich with the remains of sminthid rodents, a clade today represented by a single genus, Sicista. In contrast, the North American record of the family is sparse and exclusively composed of species of Plesiosminthus, an animal bearing a grooved incisor, during the Oligocene. This fossil record is the product of dispersal events from Eurasia. We here present the first occurrence of a smooth-incisor sminthid from North America. The new species, Heosminthus teredens from the Arikareean-aged Cabbage Patch beds of Montana, represents a rare occurrence of cranial material showing the clear association between incisors and cheek teeth, and the first postcranial remains for fossil sminthids. Our phylogenetic analysis, expanding on prior work, shows that Heosminthus teredens is most closely related to Heosminthus borrae, from Mongolia. In combination with published radioisotopic dating, our phylogenetic framework of sminthids provides evidence for an additional dispersal of sminthid rodents from Eurasia to North America 30 million years ago via Beringia. Our morphometric analysis of the tibia and metatarsal supports a terrestrial ecology for the new species; it is possible the animal had limited scansorial and/or saltatorial abilities. The large sample size of teeth available for the new taxon enables an analysis of morphological variation and indicates a high degree of polymorphism as well as a large size variation, even when controlling for stratigraphical and geographical range.


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Article DOI: 10.1080/14772019.2022.2111232

Project DOI: 10.7934/P4168, http://dx.doi.org/10.7934/P4168
This project containsMatrices
  • 3 Media
  • 1 Matrix
  • 43 Taxa
  • 1 Specimen
  • 46 Characters
Total size of project's media files: 1.2M

Download Project SDD File
Total scored cells: 1956
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 46
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 117
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:46/0
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MorphoBank Project 4168

    Authors' Institutions

    • Ohio State University

    • University of Washington

    • Carnegie Museum of Natural History



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Jonathan Calede
    Project Administrator
    431046001956
    (1956, 0, 0)
    000
    MorphoBank Curator
    Full membership
    0030000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M28913' (43 Taxa)

    taxon unscored
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    NPA
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    "-" cellscell images labels on
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    [1] Allosminthus ernos
    Last Modified in 08/18/22
    1494500002
    [2] Bohlinosminthus parvulus
    Last Modified in 08/18/22
    0524600002
    [3] † Heosminthus teredens
    Last Modified in 08/18/22
    0504600002
    [4] Heosminthus primiveris
    Last Modified in 08/18/22
    1484500002
    [5] Heosminthus borrae
    Last Modified in 08/18/22
    0484600002
    [6] Heosminthus nomogenesis
    Last Modified in 08/18/22
    4454200002
    [7] Heosminthus chimidae
    Last Modified in 08/18/22
    0514600002
    [8] Heterosminthus firmus
    Last Modified in 08/18/22
    1464500002
    [9] Heterosminthus erbajevae
    Last Modified in 08/18/22
    3474300002
    [10] Onjosminthus baindi
    Last Modified in 08/18/22
    0494600002
    [11] Parasminthus debruijni
    Last Modified in 08/18/22
    1494500002
    [12] Shamosminthus sodovis
    Last Modified in 08/18/22
    2514400002
    [13] Sinosminthus inapertus
    Last Modified in 08/18/22
    1464500002
    [14] Plesiosminthus olzi
    Last Modified in 08/18/22
    1504500002
    [15] Plesiosminthus clivosus
    Last Modified in 08/18/22
    3464300002
    [16] Plesiosminthus barsboldi
    Last Modified in 08/18/22
    1474500002
    [17] Plesiosminthus asiaticus
    Last Modified in 08/18/22
    0484600002
    [18] Plesiosminthus vegrandis
    Last Modified in 08/18/22
    4474200002
    [19] Schaubeumys grangeri
    Last Modified in 08/18/22
    0484600002
    [20] Schaubeumys sabrae
    Last Modified in 08/18/22
    5414100002
    [21] Plesiosminthus admyarion
    Last Modified in 08/18/22
    3484300002
    [22] Plesiosminthus meridionalis
    Last Modified in 08/18/22
    5434100002
    [23] Plesiosminthus schaubi
    Last Modified in 08/18/22
    3444300002
    [24] Plesiosminthus myarion
    Last Modified in 08/18/22
    4434200002
    [25] Plesiosminthus winistoerferi
    Last Modified in 08/18/22
    1474500002
    [26] Plesiosminthus conjunctus
    Last Modified in 08/18/22
    3444300002
    [27] Plesiosminthus moralesi
    Last Modified in 08/18/22
    4464200002
    [28] Megasminthus gladiofex
    Last Modified in 08/18/22
    3434300002
    [29] Megasminthus tiheni
    Last Modified in 08/18/22
    3454300002
    [30] Macrognathomys gemmacollis
    Last Modified in 08/18/22
    8413800002
    [31] Macrognathomys bartlett
    Last Modified in 08/18/22
    6414000002
    [32] Sicista primus
    Last Modified in 08/18/22
    1494500002
    [33] Sicista gaotege
    Last Modified in 08/18/22
    6434000002
    [34] Sicista wangi
    Last Modified in 08/18/22
    5424100002
    [35] Sicista praeloriger
    Last Modified in 08/18/22
    6424000002
    [36] Sicista bagajevi
    Last Modified in 08/18/22
    5414100002
    [37] Sicista bilike
    Last Modified in 08/18/22
    5434100002
    [38] Sicista betulina
    Last Modified in 08/18/22
    5434100002
    [39] Sicista concolor
    Last Modified in 08/18/22
    5424100002
    [40] Sicista subtilis
    Last Modified in 08/18/22
    5414100002
    [41] Litodonomys minimus
    Last Modified in 08/18/22
    9383700002
    [42] Litodonomys lajeensis
    Last Modified in 08/18/22
    2464400002
    [43] Omoiosicista fui
    Last Modified in 08/18/22
    7433900002


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    Matrix views208Matrix landing page (188 views); Character Matrix - Sminthidae (20 views);
    Specimen list453
    Taxon list923
    Bibliography162
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    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project4
    Matrix downloads3Character Matrix - Sminthidae (3 downloads);
    Project downloads1