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Project 4171: K. Chiba, A. R. Fiorillo, L. L. Jacobs, Y. Kimura, Y. Kobayashi, N.i Kohno, Y. Nishida, M. J. Polcyn, K. Tanaka. 2016. A new desmostylian mammal from Unalaska (USA) and the robust Sanjussen jaw from Hokkaido (Japan), with comments on feeding in derived desmostylids. Historical Biology. 28:289-303.
Specimen: † Ounalashkastylus tomidai Chiba et al., 2016 (MOTA:MOTA2004.009.06)
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Abstract

Derived members of the enigmatic mammalian order Desmostylia have molars comprising appressed columns whose morphology does not render their function in feeding simple to discern. Here we describe a new genus and species, Ounalashkastylus tomidai, more derived than Cornwallius but less derived than Desmostylus and Vanderhoofius, which develop a hypertrophied medial eminence on the dentary ontogenetically. Tooth morphology, vaulted palate and the medial eminence, which can rise to the level of the occlusal surface of M2, suggest that derived desmostylids clenched their teeth strongly while employing suction during feeding, most likely on marine and coastal plants.


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Article DOI: 10.1080/08912963.2015.1046718

Project DOI: 10.7934/P4171, http://dx.doi.org/10.7934/P4171
This project containsMatrices
  • 7 Media
  • 1 Matrix
  • 10 Documents
  • 13 Taxa
  • 7 Specimens
  • 39 Characters
Total size of project's media files: 10.58M

Download Project SDD File 		Total scored cells: 350
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 39
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 82
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:39/0
Currently Viewing:
MorphoBank Project 4171

    Authors' Institutions

    • Hokkaido University

    • University of Calgary

    • University of Toronto

    • University of Tsukuba

    • National Museum of Nature and Science, Japan

    • Perot Museum of Nature and Science

    • Southern Methodist University



    Members

    member name taxa specimens media chars character
    media
    		labels
    		cell scorings
    (scored, NPA, "-")    		cell
    medialabels
    		rules
    Michael Polcyn
    Project Administrator    		13773900350
    (341, 0, 9)    		000
    Kentaro Chiba
    Full membership     		0000000
    (0, 0, 0)    		000


    Taxonomic Overview for Matrix 'M28698' (13 Taxa)

    taxon unscored
    cells    		 scored
    cells     		no cell
    support     		NPA
    cells    		 "-" cellscell images labels on
    cell images    		 member
    access
    [1] † Moeritherium
    Last Modified in 02/04/22    		2363601002
    [2] † Pezosiren portelli
    Last Modified in 02/04/22    		5303004002
    [3] † Anthracobunidae
    Last Modified in 02/04/22    		15242400002
    [4] † Archaeoparadoxia weltoni
    Last Modified in 02/04/22    		6333300002
    [5] † Paleoparadoxia tabatai
    Last Modified in 02/04/22    		2373700002
    [6] † Behemotops proteus
    Last Modified in 02/04/22    		15242400002
    [7] † Behemotops katsuiei
    Last Modified in 02/04/22    		21181800002
    [8] † Ashoroa laticosta
    Last Modified in 02/04/22    		23161600002
    [9] † Cornwallius sookensis
    Last Modified in 02/04/22    		6333300002
    [10] † Desmostylus hesperus
    Last Modified in 02/04/22    		1383800002
    [11] † Vanderhoofius coalingensis
    Last Modified in 02/04/22    		11262602002
    [12] † Sanjussen specimen UHR32380
    Last Modified in 02/04/22    		27101002002
    [13] † Ounalashkastylus tomidai
    Last Modified in 02/03/22    		23161600002


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views8622
    Project overview715
    Media views2385Media search (1090 views); M838495 (176 views); M838490 (183 views); M838491 (200 views); M838492 (183 views); M838493 (177 views); M838494 (190 views); M838496 (186 views);
    Documents list385
    Views for media list697
    Specimen list1722
    Bibliography263
    Taxon list2103
    Matrix views352Matrix landing page (309 views); character taxon matrix for Chiba et al., 2016 (43 views);




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project54
    Document downloads243d pdf of MOTA2004.009.01 (4 downloads); 3d pdf of MOTA2004.009.06 complete (2 downloads); 3d pdf of MOTA2004.009.06 counterpart (2 downloads); 3d pdf of MOTA2004.009.06 part (2 downloads); 3d pdf of MOTA2004.009.07 (3 downloads); 3d pdf of MOTA2004.009.02 (2 downloads); 3d pdf of MOTA2004.009.05 (2 downloads); 3d pdf of MOTA2004.009.03 (3 downloads); 3d pdf of MOTA2004.009.03 Restored (2 downloads); 3d pdf of MOTA2004.009.04 (2 downloads);
    Project downloads19
    Media downloads9M838490 (2 downloads); M838491 (2 downloads); M838492 (1 download); M838493 (1 download); M838494 (1 download); M838495 (1 download); M838496 (1 download);
    Matrix downloads2character taxon matrix for Chiba et al., 2016 (2 downloads);