Project 2238: F. G. Marx, C. 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 (12):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.


Read the article »

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: 19.87M

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
Total character states with media with labels:0
Total unordered/ordered characters:247/25
Currently Viewing:
MorphoBank Project 2238

    Authors' Institutions

    • National Museum of Natural History, Smithsonian Institution

    • University of Otago

    • National Museum of Nature and Science, Japan



    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
    access
    [1] † Fucaia buelli
    Last Modified in 09/10/15
    014901203172186none


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views24498
    Project overview2596
    Matrix views1657Matrix landing page (1470 views); Fucaia (187 views);
    Documents list1098
    Media views15980Media search (2365 views); M390797 (278 views); M390787 (317 views); M390819 (244 views); M390829 (250 views); M390786 (245 views); M390836 (244 views); M390790 (294 views); M390810 (241 views); M390830 (248 views); M390806 (267 views); M390834 (232 views); M390825 (231 views); M390818 (279 views); M390816 (291 views); M390833 (225 views); M390813 (273 views); M390793 (364 views); M390832 (239 views); M390823 (247 views); M390831 (235 views); M390788 (301 views); M390792 (271 views); M390812 (286 views); M390799 (278 views); M390822 (267 views); M390814 (253 views); M390804 (234 views); M390824 (248 views); M390794 (267 views); M390821 (258 views); M390802 (243 views); M390827 (246 views); M390820 (266 views); M390811 (256 views); M390835 (258 views); M395328 (260 views); M390795 (260 views); M390796 (256 views); M390826 (237 views); M390789 (250 views); M390800 (268 views); M390808 (272 views); M390807 (279 views); M390798 (238 views); M390815 (254 views); M390791 (303 views); M390809 (261 views); M390803 (254 views); M390817 (269 views); M390805 (280 views); M390828 (225 views); M390801 (273 views);
    Taxon list1433
    Specimen list1141
    Bibliography593




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project222
    Document downloads6Fucaia complete matrix (6 downloads);
    Project downloads192
    Matrix downloads24Fucaia (24 downloads);