Project 2442: J. H. G. Geisler, R. W. Boessenecker, M. Brown, B. L. Beatty. 2017. Origin of Filter Feeding in Whales. Current Biology. (In Press)
Specimen: † Coronodon havensteini (CCNHM:108)
View: Reconstruction

Abstract

As the largest known vertebrates of all time, mysticetes depend upon keratinous sieves called baleen to capture enough small prey to sustain their enormous size. The origins of baleen are controversial, with one hypothesis suggesting that teeth were lost during a suction-feeding stage of mysticete evolution and that baleen evolved thereafter. Here we report a new species of toothed mysticete, Coronodon havensteini, from the Oligocene of South Carolina that is transitional between raptorial archaeocete whales and modern mysticetes. Although the morphology and wear on its anterior teeth indicate that it captured large prey, its broad, imbricated, multi-cusped lower molars frame narrow slots that were likely used for filter-feeding. Coronodon havensteini is a basal, if not the most basal, mysticete, and our analysis suggests that it is representative of an initial stage of mysticete evolution where teeth were functional analogues to baleen. In later lineages the diastema between teeth increased, in some cases markedly so and may mark a stage where the balance of the oral fissure shifted from mostly teeth to mostly baleen. When placed in a phylogenetic context, our new taxon indicates that filter-feeding was preceded by raptorial feeding, and that suction-feeding evolved separately within a clade removed from modern baleen whales


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Article DOI: http://dx.doi.org/10.1016/j.cub.2017.06.003

Project DOI: 10.7934/P2442, http://dx.doi.org/10.7934/P2442
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 4 Documents
  • 54 Taxa
  • 1 Specimen
  • 206 Characters
Total size of project's media files: 1 MB

Download Project SDD File
Total scored cells: 8178
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 206
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 568
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:149/57
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MorphoBank Project 2442

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    member name taxa specimens media chars character
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    (scored, NPA, "-")
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    Jonathan Geisler
    Project Administrator
    Last logged in 06/30/17
    5411206008178
    (6914, 0, 1264)
    000


    Taxonomic Overview for Matrix 'M24000' (53 Taxa)

    taxon unscored
    cells
    scored
    cells
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    [1] Megaptera novaeangliae
    Last Modified in 06/12/16
    20170165021001
    [2] Balaenoptera physalus
    Last Modified in 06/12/16
    12183179015001
    [3] Balaenoptera musculus
    Last Modified in 06/12/16
    6147144056001
    [4] Balaenoptera borealis
    Last Modified in 06/12/16
    8145142056001
    [5] Balaenoptera edeni brydei
    Last Modified in 06/12/16
    6148144056001
    [6] Balaenoptera bonaerensis
    Last Modified in 06/12/16
    7145143056001
    [7] Balaenoptera acutorostrata
    Last Modified in 06/12/16
    6147144056001
    [8] Eschrichtius robustus
    Last Modified in 06/12/16
    20167164022001
    [9] Caperea marginata
    Last Modified in 06/12/16
    25163160021001
    [10] Balaena mysticetus
    Last Modified in 06/12/16
    16138135055001
    [11] Eubalaena
    Last Modified in 06/12/16
    13181179014001
    [12] † Aglaocetus patulus
    Last Modified in 06/30/17
    559593058001
    [13] † Cetotherium rathkii
    Last Modified in 06/30/17
    846462060001
    [14] † Cophocetus oregonensis
    Last Modified in 06/30/17
    4610299061001
    [15] † Diorocetus hiatus
    Last Modified in 06/30/17
    35164159012001
    [16] Isanacetus laticephalus
    Last Modified in 06/12/16
    73129121012001
    [17] Mixocetus elysius
    Last Modified in 06/12/16
    4853510107001
    [18] Parietobalaena palmeri
    Last Modified in 06/12/16
    27124120059001
    [19] Pelocetus calvertensis
    Last Modified in 06/12/16
    33161160013001
    [20] † Balaenoptera gastaldii
    Last Modified in 06/30/17
    509895061001
    [21] SDSNH 90517
    Last Modified in 06/12/16
    2387820101001
    [22] Megaptera miocaena
    Last Modified in 06/12/16
    816866059001
    [23] Megaptera hubachi
    Last Modified in 06/12/16
    40112109057001
    [24] Parabalaenoptera baulinen
    Last Modified in 06/12/16
    991049908001
    [25] Eomysticetus whitmorei
    Last Modified in 06/12/16
    5814014008001
    [26] Tohoraata spp.
    Last Modified in 06/12/16
    105949209001
    [27] Micromysticetus
    Last Modified in 06/12/16
    136706703001
    [28] Yamatocetus canaliculatus
    Last Modified in 06/12/16
    48145141017001
    [29] Tokarahia spp.
    Last Modified in 06/12/16
    6015114600001
    [30] Waharoa ruwhenua
    Last Modified in 06/12/16
    5515315100001
    [31] Fucaia buelli
    Last Modified in 06/12/16
    9311611300001
    [32] † Aetiocetus weltoni
    Last Modified in 06/30/17
    6713513405001
    [33] † Aetiocetus cotylalveus
    Last Modified in 06/30/17
    8112512500001
    [34] † Aetiocetus polydentatus
    Last Modified in 06/30/17
    6114214005001
    [35] Fucaia goedertorum
    Last Modified in 06/12/16
    5115815500001
    [36] † Chonecetus sookensis
    Last Modified in 06/30/17
    137726603001
    [37] Llanocetus
    Last Modified in 06/12/16
    6611497043001
    [38] Janjucetus hunderi
    Last Modified in 06/12/16
    6614114000001
    [39] Mammalodon colliveri
    Last Modified in 06/12/16
    7413413002001
    [40] † ChM pv5720
    Last Modified in 06/30/17
    41149142023001
    [41] † CCNHM 108
    Last Modified in 06/30/17
    3917016601001
    [42] Metasqualodon symmetricus
    Last Modified in 06/12/16
    174353200001
    [43] ZMT 62
    Last Modified in 06/12/16
    190261600001
    [44] Simocetus
    Last Modified in 06/12/16
    7613212802001
    [45] Squalodon calvertensis
    Last Modified in 06/12/16
    6114514203001
    [46] † Agorophius
    Last Modified in 06/30/17
    108989503001
    [47] Waipatia
    Last Modified in 06/12/16
    4716115405001
    [48] Physeter macrocephalus
    Last Modified in 06/12/16
    20177172014001
    [49] Ziphiidae
    Last Modified in 06/12/16
    29167164013001
    [50] Zygorhiza kochii
    Last Modified in 06/12/16
    1718918900001
    [51] † Basilosaurus
    Last Modified in 06/30/17
    5115115005001
    [52] † Dorudon
    Last Modified in 06/30/17
    2518017902001
    [53] Georgiacetus
    Last Modified in 06/12/16
    5814914602001


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    Project overview987
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    Media views1037Media search (856 views); M451800 (181 views);
    Documents list420
    Bibliography219
    Views for media list335
    Specimen list558
    Taxon list3908




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project102
    Matrix downloads25Morphological Data Matrix (25 downloads);
    Project downloads71
    Document downloads6Matrix for Likelihood Optimization of Diastema size (2 downloads); Matrix for Parsimony Optimization of Diastema size (1 download); Trees from Analyses (2 downloads); Supermatrix of Morphological and Molecular data (1 download);