Project 2238: F. G. Marx,C.-H. Tsai,R. E. Fordyce. 2015. A new Early Oligocene toothed ‘baleen’ whale (Mysticeti: Aetiocetidae) from western North America: one of the oldest and the smallest. Royal Society Open Science. 2:150476.
Specimen: † Fucaia buelli (UWBM:84024)

Abstract

Archaic toothed mysticetes represent the evolutionary transition from raptorial to bulk filter feeding in baleen whales. Aetiocetids, in particular, preserve an intermediate morphological stage in which teeth functioned alongside a precursor of baleen, the hallmark of all modern mysticetes. To date, however, aetiocetids are almost exclusively Late Oligocene and coeval with both other toothed mysticetes and fully fledged filter feeders. By contrast, reports of cetaceans from the Early Oligocene remain rare, leaving the origins of aetiocetids, and thus of baleen, largely in the dark. Here, we report a new aetiocetid, Fucaia buelli, from the earliest Oligocene (ca 33–31 Ma) of western North America. The new material narrows the temporal gap between aetiocetids and the oldest known mysticete, Llanocetus (ca 34 Ma). The specimen preserves abundant morphological detail relating to the phylogenetically informative ear bones (otherwise poorly documented in this family), the hyoid apparatus and much of the (heterodont) dentition. Fucaia comprises some of the smallest known mysticetes, comparable in size with the smallest odontocetes. Based on their phylogenetic relationships and dental and mandibular morphology, including tooth wear patterns, we propose that aetiocetids were suction-assisted raptorial feeders and interpret this strategy as a crucial, intermediary step, enabling the transition from raptorial to filter feeding. Following this line of argument, a combination of raptorial and suction feeding would have been ancestral to all toothed mysticetes, and possibly even baleen whales as a whole.


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Article DOI: 10.1098/rsos.150476

Project DOI: 10.7934/P2238, http://dx.doi.org/10.7934/P2238
This project containsMatrices
  • 52 Media
  • 1 Matrix
  • 1 Document
  • 1 Taxon
  • 1 Specimen
  • 272 Characters
Total size of project's media files: 40 MB

Download Project SDD File
Total scored cells: 272
Total media associated with cells: 172
Total labels associated with cell media: 186
Characters
Total characters: 272
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 635
Total character states with associated media: 0
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Total unordered/ordered characters:247/25
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MorphoBank Project 2238


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    notes  medialabels
    rules
    Felix Marx
    Project Administrator
    Last logged in 12/02/15
    115227200272
    (149, 120, 3)
    31721860


    Taxonomic Overview for Matrix 'M23561' (1 Taxon)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
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    [1] † Fucaia buelli
    Last Modified in 09/10/15
    014901203172186none


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views18662
    Project overview2019
    Matrix views1271Matrix landing page (1113 views); Fucaia (158 views);
    Documents list939
    Media views12235Media search (1874 views); M390797 (206 views); M390787 (206 views); M390819 (172 views); M390829 (203 views); M390786 (180 views); M390836 (198 views); M390790 (201 views); M390810 (176 views); M390830 (201 views); M390806 (202 views); M390834 (172 views); M390825 (179 views); M390818 (204 views); M390816 (227 views); M390833 (171 views); M390813 (202 views); M390793 (290 views); M390832 (200 views); M390823 (179 views); M390831 (190 views); M390788 (211 views); M390792 (206 views); M390812 (212 views); M390799 (212 views); M390822 (204 views); M390814 (189 views); M390804 (170 views); M390824 (189 views); M390794 (196 views); M390821 (189 views); M390802 (176 views); M390827 (196 views); M390820 (206 views); M390811 (189 views); M390835 (215 views); M395328 (218 views); M390795 (200 views); M390796 (194 views); M390826 (190 views); M390789 (174 views); M390800 (211 views); M390808 (200 views); M390807 (202 views); M390798 (170 views); M390815 (190 views); M390791 (245 views); M390809 (175 views); M390803 (187 views); M390817 (293 views); M390805 (215 views); M390828 (172 views); M390801 (206 views);
    Taxon list865
    Specimen list864
    Bibliography469




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project166
    Document downloads6Fucaia complete matrix (6 downloads);
    Project downloads136
    Matrix downloads24Fucaia (24 downloads);