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Rediscovery and augmented description of the HMS ‘Challenger’ acorn worm (Hemichordata, Enteropneusta), Glandiceps abyssicola, in the equatorial Atlantic abyss

  • Nicholas D. Holland (a1), Karen J. Osborn (a2), Andrey V. Gebruk (a3) and Antonina Rogacheva (a3)


A 2009 oceanographic expedition of the Russian Academy of Sciences collected the anterior region of a single acorn worm (phylum Hemichordata, class Enteropneusta) by trawling at a depth of 5560 m in the Romanche Trench (equatorial Atlantic). The specimen was a ripe female with numerous, relatively small oocytes in each ovary. Phylogenetic analysis of rDNA sequences robustly placed the worm in the family Spengelidae. In addition, morphological features of the proboscis, collar, and anterior trunk region indicated that the worm was Glandiceps abyssicola, a species previously represented solely by the holotype, which had been dredged from the equatorial Atlantic in 1873 by the HMS ‘Challenger’ and subsequently sent to Germany for description by Spengel (1893). The holotype was presumably destroyed by World War II bombing; therefore, we here designate the Romanche Trench specimen as the neotype of G. abyssicola and supply an augmented species diagnosis.


Corresponding author

Correspondence should be addressed to: N.D. Holland, Marine Biology Research Division, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093 USA email:


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An, J.M. and Li, X.Z. (2005) First record of the family Spengeliidae [sic] (Hemichordata: Enteropneusta) from Chinese waters, with description of a new species. Journal of Natural History 39, 19952004.
Anderson, T.J., Przeslawski, R. and Tran, M. (2011) Distribution, abundance and trail characteristics of acorn worms at Australian continental margins. Deep-Sea Research Part II 58, 970978.
Ankel, W.E. (1957) Zur Geschichte der wissenschaftlichen Biologie in Giessen. In Ankel, W.E. (ed.) Universitätsjubiläum, Ludwigs-Universität, Justus-Liebig-Hochschule 1607–1957. Giessen: Töpelmann, pp. 308340.
Bateson, W. (1885) Note on the later stages in the development of Balanoglossus kowalevskii (Agassiz), and on the affinities of the Enteropneusta. Proceedings of the Royal Society of London, B 38, 2330.
Belichov, D.V. (1971) Kishechnodyshashie (Enteropneusta) Kurilo-Kamchatskoj Vpading (Tuskarory), Glossobalanus tuscarorae n. sp. [Enteropneusta from the Kuril-Kamchatka Trench (Tuscarora Deep), Glossobalanus tuscarorae n. sp.]. Voprosy Zoologii, Sbornik 2, Kazanskiy Pedagogicheskiy Institut [Problems in Zoology, Series 2, Kazan Pedagogical University] (61), 3–38.
Benito, J. and Prados, F. (1997) Hemichordata. In Harrison, F.W. and Ruppert, E.E. (eds) Microscopic anatomy of invertebrates. Volume 15, Hemichordata, Chaetognatha, and the invertebrate chordates. New York: Wiley-Liss, pp. 15101.
Cameron, C.B. and Perez, M. (2012) Spengelidae (Hemichordata: Enteropneusta) from the Eastern Pacific including a new species, Schizocardium californicum, from California. Zootaxa 3569, 7988.
Cifelli, C. (1967) Age relations of mid-Atlantic ridge sediments. American Association of Petroleum Geolologists Bulletin 51, 458.
Cole, A.G. and Hall, B.K. (2004) The nature and significance of invertebrate cartilages revisited: distribution and histology of cartilage and cartilage-like tissues within the Metazoa. Zoology (Jena) 107, 261273.
Gegenbaur, C. (1870) Grundzüge der vergleichenden Anatomie. 2nd edition. Leipzig: Engelmann.
Hadfield, M.G. (1975) Hemichordata. In Giese, A.C. and Pearse, J.S. (eds) Reproduction in marine invertebrates. Volume 2. New York: Academic Press, pp. 185240.
Harmer, S.F. (1904) Hemichordata. In Harmer, S.F. and Shipley, A.E. (eds) Cambridge natural history. Volume 7. London: Macmillan, pp. 334.
Heezen, B.C. and Laughton, A.S. (1963) Abyssal plains. In Hill, M.N. (ed.) The earth beneath the sea: history. Volume 3. New York: John Wiley & Sons, pp. 312364.
Holland, N.D., Clague, D.A., Gordon, D.P., Gebruk, A., Pawson, D.L. and Vecchione, M. (2005) ‘Lophenteropneust’ hypothesis refuted by collection and photos of new deep-sea hemichordates. Nature 434, 374376.
Holland, N.D., Jones, W.J., Ellena, J., Ruhl, H.A. and Smith, K.L. (2009) A new deep-sea species of epibenthic acorn worm (Hemichordata, Enteropneusta). Zoosystema 31, 333346.
Holland, N.D., Kuhnz, L.A. and Osborn, K.J. (2012a) Morphology of a new deep-sea acorn worm (class Enteropneusts, phylum Hemichordata): a part-time demersal drifter with externalized ovaries. Journal of Morphology 273, 661671.
Holland, N.D., Osborn, K.J. and Kuhnz, L.A. (2012b) A new deep-sea species of harrimaniid enteropneust (Hemichordata). Proceedings of the Biological Society of Washington 125, 228240.
Horst, C.J. van der (1940) The Enteropneusta from Inyack Island, Delagoa Bay. Annals of the South African Museum 32, 293380.
Marion, M.A.F. (1886) Etudes zoologiques sur deux espèces d'entéropneustes (Balanoglossus hacksi et Balanoglossus talaboti). Archives de Zoologie Expérimentale et Générale. Série 2. 4, 305326 + pl. XVI–XVII.
Morozov, E.G., Tarakanov, R.Y., Demidova, T.A. and Zyulyaeva, Y.A. (2010) Measurements of currents in the Kane and Romanche underwater channels during cruise 29 of the research vessel Akademik Ioffe . Oceanology 50, 623626.
Osborn, K.J., Kuhnz, L.A., Priede, I.J., Urata, M., Gebruk, A.V. and Holland, N.D. (2012) Diversification of acorn worms (Hemichordata, Enteropneusta) revealed in the deep sea. Proceedings of the Royal Society, B 279, 16461654.
Posada, D. (2008) jModelTest: phylogenetic model averaging. Molecular Biology and Evolution 25, 12531256.
Priede, I.J., Osborn, K.J., Gebruk, A.V., Jones, D., Shale, D., Rogacheva, A. and Holland, N.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, 244257.
Smith, K.L., Holland, N.D. and Ruhl, H.A. (2005) Enteropneust production of spiral fecal trails on the deep-sea floor observed with time-lapse photography. Deep-Sea Research Part I 52, 12281240.
Spengel, J.W. (1891) Über die Gattungen der Enteropneusten. Verhandlungen der Deutschen Zoologischen Gesellschaft 1, 4748.
Spengel, J.W. (1893) Die Enteropneusten des Golfes von Neapel. Fauna und Flora des Golfes von Neapel und der angrenzenden Meeres-Abschnitte. Herausgegeben von der zoologischen Station zu Neapel. Monographie 18. Berlin: Friedländer, pp. ixii + 1–756 + pl. I–XXXVII.
Spengel, J.W. (1907) Studien über die Enteropneusten der Siboga-Expedition nebst Beobachtungen an verwandten Arten. Monographie 26, Siboga-Expiditie, uitkomsten op zoologisch, botanisch, oceanographisch en geologisch gebied verzameld in Nederlandisch Oost-Indië 1899–1900. Leiden: Brill, pp. 1126 + pl. I–XVII.
Spicer, S.S. (1963) Histochemical differentiation of mammalian mucopolysaccharides. Annals of the New York Academy of Sciences 106, 379388.
Théel, H. (1882) Report on the Holothuroidea dredged by H.M.S. Challenger—Volume 4, fifth part. Report of the scientific results of the voyage of the H.M.S. Challenger during the years 1873–76. London: Her Majesty's Stationery Office, pp. 1176 + pl. I–XLVI.
Thomson, C.W. (1875) Dr R. von Willemoes-Suhm. Nature 13, 8889.
Thomson, C.W. and Murray, J. (1885) Narrative—Volume 1, first part. Report of the scientific results of the voyage of the H.M.S. Challenger during the years 1873–76. London: Her Majesty's Stationery Office, pp. vliv + 1–509.
Urata, M., Iwasaki, S. and Ohtsuka, S. (2012) Biology of the swimming acorn worm Glandiceps hacksi from the Seto Inland Sea of Japan. Zoological Science 29, 305310.
Willemoes-Suhm, R. von (1871) Biologische Beobachtungen über niedere Meeresthiere, 4. Ueber Balanoglossus kupfferi . Zeitschrift für wissenschaftliche Zoologie 21, 383385.
Willey, A. (1898) Spengelia, a new genus of Enteropneusta. Quarterly Journal of Microscopical Science 40, 623630.
Willey, A. (1899) Remarks on some recent work on the Protochorda, with a condensed account of some fresh observations on the Enteropneusta. Quarterly Journal of Microscopical Science 42, 223244.
Woodwick, K.H. and Sensenbaugh, T. (1985) Saxipendium coronatum, new genus, new species (Hemichordata: Enteropneusta): the unusual spaghetti worms of the Galapagos hydrothermal vents. Proceedings of the Biological Society of Washington 98, 351365.
Worsaae, K., Sterrer, W., Kaul-Strehlow, S., Hay-Schmidt, A. and Giribet, G. (2012) An anatomical description of a miniaturized acorn worm (Hemichordata, Enteropneusta) with asexual reproduction by paratomy. PLoS ONE 7 (11) e48529.
Young, C.M. (1994) A tale of two dogmas: the early history of deep-sea reproductive biology. In Young, C.M. and Eckelbarger, K.J. (eds) Reproduction, larval biology, and recruitment of the deep-sea benthos. New York: Columbia University Press, pp. 125.


Rediscovery and augmented description of the HMS ‘Challenger’ acorn worm (Hemichordata, Enteropneusta), Glandiceps abyssicola, in the equatorial Atlantic abyss

  • Nicholas D. Holland (a1), Karen J. Osborn (a2), Andrey V. Gebruk (a3) and Antonina Rogacheva (a3)


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