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Smithsonian National Museum of Natural History

Department of Invertebrate Zoology

Sapphirina auronitens

A drawing by Giesbrecht (1892) of the Copepoda, Sapphirina auronitens Claus, 1863

bar Image of Karen Osborn

Karen J. OsbornResearch Zoologist

  • Phone: 202-633-3668
  • Fax: 202-633-0182
  • E-mail:
  • Osborn Lab Website

  • Mailing Address:
    Smithsonian Institution
    PO Box 37012, MRC 163
    Washington, DC 20013-7012

  • Courier Delivery Address:
    Smithsonian Institution
    National Museum of Natural History
    10th and Constitution Ave, NW
    Washington, DC 20560-0163

    Responsibilities: Research Zoologist, Curator of Polychaeta and Peracarida

    Ph.D. University of California, Berkeley 2007
    M.S. Western Washington University, 1999
    B.S. Andrews University, 1996

    Research Interests: Pelagic invertebrate evolution

    Recent Publications:
    Baldwin Fergus, Jamie L, Johnsen, Sö and Osborn, Karen J. 2015. A Unique Apposition Compound Eye in the Mesopelagic Hyperiid Amphipod Paraphronima gracilis. Current Biology, 25(4): 473-478. doi:10.1016/j.cub.2014.12.010

    Osborn, Karen J., Gebruk, Andrey V., Rogacheva, Antonina and Holland, Nicholas D. 2013. An Externally Brooding Acorn Worm (Hemichordata, Enteropneusta, Torquaratoridae) from the Russian Arctic. The Biological bulletin, 225(2): 113-123.

    Holland, Nicholas D., Osborn, Karen J., Gebruk, Andrey V. and Rogacheva, Antonina 2013. Rediscovery and augmented description of the HMS 'Challenger' acorn worm (Hemichordata, Enteropneusta), Glandiceps abyssicola, in the equatorial Atlantic abyss. Journal of the Marine Biological Association of the United Kingdom, 93(8): 2197-2205. doi:10.1017/S0025315413000684

    Priede, Imants G., Osborn, Karen J., Gebruk, Andrey V., Jones, Dan, Shale, David, Rogacheva, Antonina and Holland, Nicholas D. 2012. Observations on torquaratorid acorn worms (Hemichordata, Enteropneusta) from the North Atlantic with descriptions of a new genus and three new species. Invertebrate Biology, 131(3): 244-257. doi:10.1111/j.1744-7410.2012.00266.x

    Holland, Nicholas D., Osborn, Karen J. and Kuhnz, Linda A. 2012. A new deep-sea species of harrimaniid enteropneust (Hemichordata). Proceedings of the Biological Society of Washington, 125(3): 228-240. doi:10.2988/12-11.1

    Holland, Nicholas D., Kuhnz, Linda A. and Osborn, Karen J. 2012. Morphology of a new deep-sea acorn worm (class Enteropneusta, phylum Hemichordata): A part-time demersal drifter with externalized ovaries. Journal of Morphology, 273(7): 661-671. doi:10.1002/jmor.20013

    Kaufmann, Ronald S., Robison, Bruce H., Sherlock, Rob E., Reisenbichler, Kim R. and Osborn, Karen J. 2011. Composition and structure of macrozooplankton and micronekton communities in the vicinity of free-drifting Antarctic icebergs. Deep Sea Research Part II: Topical Studies in Oceanography, 58: 1469-1484. doi:10.1016/j.dsr2.2010.11.026

    Hull, Pincelli M., Osborn, Karen J., Norris, Richard D. and Robison, Bruce H. 2011. Seasonality and depth distribution of a mesopelagic foraminifer, Hastigerinella digitata, in Monterey Bay, California. Limnology and Oceanography, 56: 562-576. doi:10.4319/lo.2011.56.2.0562

    Sherlock, R. E., Reisenbichler, K. R., Bush, S. L., Osborn, Karen J. and Robison, B. H. 2011. Near-field zooplankton, ice-face biota and proximal hydrography of free-drifting Antarctic icebergs. Deep Sea Research Part II: Topical Studies in Oceanography, 58: 1457-1468. doi:10.1016/j.dsr2.2010.11.025

    Osborn, Karen J., Kuhnz, Linda A., Priede, Imants G., Urata, Makoto, Gebruk, Andrey V. and Holland, Nicholas D. 2011. Diversification of acorn worms (Hemichordata, Enteropneusta) revealed in the deep sea. Proceedings of the Royal Society B: Biological Sciences, 279(1733): 1646-1654. doi:10.1098/rspb.2011.1916

    Osborn, Karen J., Haddock, Steven and Rouse, Greg 2011. Swima (Annelida, Acrocirridae), holopelagic worms from the deep Pacific. Zoological Journal of the Linnean Society, 163(3): 663-678. doi:10.1111/j.1096-3642.2011.00727.x

    Full Publication List

    Download Dr. Osborn's CV

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