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Hyper-longirostry and kinematic disparity in extinct toothed whales

  • Matthew R. McCurry (a1) and Nicholas D. Pyenson (a2)

Toothed cetacean (Odontoceti) lineages in the Miocene and Pliocene evolved rostra that are proportionally more elongate than any other aquatic mammal or reptile, living or extinct. Their similarities in cranial proportions to billfish may suggest a convergent feeding style, where the rostrum is swept through the water to hit and stun prey. Here we calculated second moment of area from rostral cross sections of these fossil odontocete taxa, as well as from extant ecological analogues, to infer variation in feeding behavior. Our results show that the extremely long rostra of extinct toothed whales vary considerably in functionally relevant measures of shape and likely exhibited a diversity of feeding behaviors, ranging from those similar to modern odontocetes to those convergent with billfish. Eustatic sea-level and temperature maxima of the Miocene likely led to changes in prey characteristics or abundance that enabled the repeated evolution of this extreme morphotype, which later went extinct during late Pliocene climatic deterioration.

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Bauchau, O., and Craig, J.. 2009. Euler-Bernoulli beam theory. Pp. 173221 in Structural analysis. Springer, Dordrecht, Netherlands.
Boersma, A. T., and Pyenson, N. D.. 2016. Arktocara yakataga, a new fossil odontocete (Mammalia, Cetacea) from the Oligocene of Alaska and the antiquity of Platanistoidea. PeerJ 4:e2321.
Boessenecker, R. W., Fraser, D., Churchill, M., and Geisler, J. H.. 2017. A toothless dwarf dolphin (Odontoceti: Xenorophidae) points to explosive feeding diversification of modern whales (Neoceti). Proceedings of the Royal Society of London B 284(1861):18.
Brassey, C. A., Margetts, L., Kitchener, A. C., Withers, P. J., Manning, P. L., and Sellers, W. I.. 2013. Finite element modelling versus classic beam theory: comparing methods for stress estimation in a morphologically diverse sample of vertebrate long bones. Journal of the Royal Society Interface 10(79):111.
Busbey, A. B. 1995. The structural consequences of skull flattening in crocodilians. Cambridge University Press, Cambridge.
Cohen, K., Finney, S., Gibbard, P., and Fan, J.-X.. 2013. The ICS International Chronostratigraphic Chart. Episodes 36:199204.
Daufresne, M., Lengfellner, K., and Sommer, U.. 2009. Global warming benefits the small in aquatic ecosystems. Proceedings of the National Academy of Sciences USA 106:1278812793.
De Muizon, C. 1993. Odobenocetops peruvianus: una remarcable convergencia de adaptacion alimentaria entre morsa y delfin. Institut Francais d'Etudes Andines 22:671683.
do Amaral, K. B., Amaral, A. R., Fordyce, R. E., and Moreno, I. B.. 2016. Historical biogeography of Delphininae dolphins and related taxa (Artiodactyla: Delphinidae). Journal of Mammalian Evolution 25:241259.
Gutstein, C. S., Cozzuol, M. A., and Pyenson, N. D.. 2014. The antiquity of riverine adaptations in Iniidae (Cetacea, Odontoceti) documented by a humerus from the late Miocene of the Ituzaingo Formation, Argentina. Anatomical Record 297:10961102.
Habegger, M. L., Dean, M. N., Dunlop, J. W., Mullins, G., Stokes, M., Huber, D. R., Winters, D., and Motta, P. J.. 2015. Feeding in billfishes: inferring the role of the rostrum from a biomechanical standpoint. Journal of Experimental Biology 218:824836.
Haq, B. U., Hardenbol, J., and Vail, P. R.. 1987. Chronology of fluctuating sea levels since the Triassic. Science 235:11561167.
Herald, E. S., Brownell, R. L., Frye, F. L., Morris, E. J., Evans, W. E., and Scott, A. B.. 1969. Blind river dolphin: first side-swimming cetacean. Science 166:14081410.
Herbing, I. 2002. Effects of temperature on larval fish swimming performance: the importance of physics to physiology. Journal of Fish Biology 61:865876.
Kimura, T., and Barnes, L. G.. 2016. New Miocene fossil Allodelphinidae (Cetacea, Odontoceti, Platanistoidea) from the North Pacific Ocean. Bull. Gunma Museum of Natural History 20:158.
Lambert, O. 2005a. Phylogenetic affinities of the long-snouted dolphin Eurhinodelphis (Cetacea, Odontoceti) from the Miocene of Antwerp, Belgium. Palaeontology 48:653679.
Lambert, O. 2005b. Review of the Miocene long-snouted dolphin Priscodelphinus cristatus du Bus, 1872 (Cetacea, Odontoceti) and phylogeny among eurhinodelphinids. Bulletin de l'Institut royal des Sciences naturelles de Belgique, Sciences de la Terre 75:211235.
McCurry, M. R., Evans, A. R., Fitzgerald, E. M. G., Adams, J. W., Clausen, P. D., and McHenry, C. R.. 2017a. The remarkable convergence of skull shape in crocodilians and toothed whales. Proceedings of the Royal Society of London B 284:19.
McCurry, M. R., Fitzgerald, E. M. G., Evans, A. R., Adams, J. W., and McHenry, C. R.. 2017b. Skull shape reflects prey size niche in toothed whales. Biological Journal of the Linnean Society 121:936946.
McGowan, C. 1988. Differential development of the rostrum and mandible of the swordfish (Xiphias gladius) during ontogeny and its possible functional significance. Canadian Journal of Zoology 66:496503.
McGowen, M. R., Spaulding, M., and Gatesy, J.. 2009. Divergence date estimation and a comprehensive molecular tree of extant cetaceans. Molecular Phylogenetics and Evolution 53:891906.
McHenry, C. R. 2009. Devourer of gods: the palaeoecology of the Cretaceous pliosaur Kronosaurus queenslandicus. PhD thesis, University of Newcastle, Callaghan, NSW, Australia., accessed 10 December 2012.
McHenry, C. R., Clausen, P. D., Daniel, W. J. T., Meers, M. B., and Pendharkar, A.. 2006. Biomechanics of the rostrum in crocodilians: a comparative analysis using finite element modeling. Anatomical Record A: Discoveries in Molecular, Cellular, and Evolutionary Biology 288:827849.
Metzger, K. A., Daniel, W. J. T., and Ross, C. F.. 2005. Comparison of beam theory and finite element analysis with in vivo bone strain data from the alligator cranium. Anatomical Record A: Discoveries in Molecular, Cellular, and Evolutionary Biology 283:331348.
Pilleri, G. 1980. The secrets of the blind dolphins. Sind Wildlife Management Board, Wildlife and Forest Department, Government of Sind, Pakistan.
Pöyhönen, T., Keskinen, K. L., Hautala, A., and Mälkiä, E.. 2000. Determination of hydrodynamic drag forces and drag coefficients on human leg/foot model during knee exercise. Clinical Biomechanics 15:256260.
Pyenson, N. D., and Vermeij, G. J.. 2016. The rise of ocean giants: maximum body size in Cenozoic marine mammals as an indicator for productivity in the Pacific and Atlantic Oceans. Biology Letters 12(7):14.
Pyenson, N. D., Kelley, N. P., and Parham, J. F.. 2014. Marine tetrapod macroevolution: physical and biological drivers on 250 Ma of invasions and evolution in ocean ecosystems. Palaeogeography, Palaeoclimatology, Palaeoecology 400:18.
Racicot, R. A., Deméré, T. A., Beatty, B. L., and Boessenecker, R. W.. 2014. Unique feeding morphology in a new prognathous extinct porpoise from the Pliocene of California. Current Biology 24:774779.
Scott, W. B., and Tibbo, S. N.. 1968. Food and feeding habits of swordfish, Xiphias gladius, in the western North Atlantic. Journal of the Fisheries Research Board of Canada 25:903919.
Taylor, M. A. 1987. How tetrapods feed in water: a functional analysis by paradigm. Zoological Journal of the Linnean Society 91:171195.
Uhen, M. D., and Pyenson, N. D.. 2007. Diversity estimates, biases, and historiographic effects: resolving cetacean diversity in the Tertiary. Palaeontologia Electronica 10:11A22.
Vermeij, G. J. 2011. Shifting sources of productivity in the coastal marine tropics during the Cenozoic era. Proceedings of the Royal Society of London B 278:23622368.
Vermeij, G. J. 2012. The evolution of gigantism on temperate seashores. Biological Journal of the Linnean Society 106:776793.
Walmsley, C. W., Smits, P. D., Quayle, M. R., McCurry, M. R., Richards, H. S., Oldfield, C. C., Wroe, S., Clausen, P. D., and McHenry, C. R.. 2013. Why the long face? The mechanics of mandibular symphysis proportions in crocodiles. PLoS ONE 8:e53873.
Zachos, J. C., Dickens, G. R., and Zeebe, R. E.. 2008. An early Cenozoic perspective on greenhouse warming and carbon-cycle dynamics. Nature 451:279283.
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