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A new species of pencil smelt Nansenia boreacrassicauda (Microstomatidae, Argentiniformes) from the North Atlantic Ocean



A new microstomatid oceanic species, Nansenia boreacrassicauda spec. nov., is described from the temperate and subarctic Atlantic Ocean. The new species is part of the “stubby caudal peduncle” group and includes the northernmost record of any Nansenia species close to the Arctic Circle. The new species is putatively most similar to the Mediterranean Nansenia iberica, distinguished by a smaller caudal peduncle length/depth ratio, a smaller predorsal distance, more gill rakers, a different lateral line scale type and distribution. Extended Nansenia species distributions and specimens that show extralimital characters in relation to previous works are presented, addressing the current problematic taxonomic issues prevalent in pencil smelts and closely related genera. The new species is described due to increased collecting and taxonomic efforts off Greenland and is not necessarily related to ocean temperature changes.



Pisces, oceanic, coastal, subarctic, North Atlantic, taxonomy, mitogenome, climate change

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Ahlstrom, E.H., Moser, H.G. & Cohen, D.M. (1984) Argentinoidei: development and relationships. In: Moser, H.G., Richards, W.J., Cohen, D.M., Fahay, M.D., Kendall, A.W. & Richardson, S.C. (Eds.), Ontogeny and Systematics of Fishes. American Society of Ichthyologists and Herpetologists, Allen Press Inc., Lawrence, 760 pp.

Avise, J.C., Arnold, J., Ball, R.M., Bermingham, E., Lamb, T., Neigel, J.E., Reeb. & Saunders, N.C. (1987) Intraspecific Phylogeography: The mitochondrial DNA bridge between population genetics and systematics. Annual Review of Ecology and Systematics, 18, 489–522.

Bañón, R., Arronte, J.C., Vázquez-Dorado, S., Río, J.L.D. & Carlos, A.D. (2013) DNA barcoding of the genus Lepidion (Gadiformes: Moridae) with recognition of Lepidion eques as a junior synonym of Lepidion lepidion. Molecular Ecology Resources, 13, 189–199.

Betancur-R, R., Broughton, R.E., Wiley, E.O., Carpenter, K., López J.A., Li, C., Holcroft, N.I., Arcila, D., Sanciangco, M., Cureton II, J.C., Zhang, F., Buser, T., Campbell, M.A., Ballesteros, J.A., Roa-Varon, A., Willis, S., Borden, W.C., Rowley, T., Reneau, P.C., Hough, D.J., Lu, G., Grande, T., Arratia, G. & Ortí, G. (2013)The Tree of Life and a New Classification of Bony Fishes. PLOS Currents Tree of Life, 2013, 1–45.

Bianchi, C.N. & Morri, C. (2000) Marine biodiversity of the Mediterranean Sea: Situation, problems and prospects for future research. Marine Pollution Bulletin, 40, 367–376.

Blache, J. & Rossignol, M. (1962) Nansenia atlantica nov. sp. (Teleostei, Clupeiformes, Opisthoproctoidei, Microstomidae). Poisson bathypelagique nouveau du Golfe de Guinée (diagnose provisoire). Cahiers O. R. S. T. O. M. (Office de la Recherche Scientifique et Technique Outre-Mer) Série Océanographie, 2, 103–106.

Byrkjedal, I., Godø, O.R. & Heino, M. (2004). Northward range extensions of some mesopelagic fishes in the Northeastern Atlantic. Sarsia, 89, 484–489.

Byrkjedal, I., Poulsen, J.Y. & Galbraith, J. (2011) Leptoderma macrophthalmum n.sp., a new species of smooth-head (Otocephala: Alepocephalidae) from the Mid Atlantic Ridge. Zootaxa, 2876, 49–56.

Chakrabarty, P., Warren, M., Page, L.M. & Baldwin, C.C. (2013) GenSeq: an updated nomenclature and ranking for genetic sequences from type and non-type sources. Zookeys, 346, 29–41.

Cheng, S., Higuchi, R. & Stoneking, M. (1994) Complete mitochondrial genome amplification. Nature Genetics, 7, 350–351.

Cohen, D.M. (1958) Nansenia candida, a new species of argentinid fish from the North Pacific, with notes on other species of Nansenia. Stanford Ichthyological Bulletin, 7, 52–57.

Cohen, D.M. (1984) Argentinidae. In: Whitehead, P.J.P., Bauchot, M.L., Hureau, J.C., Nielsen, J. & Tortonese, E. (Eds.), Fishes of the North-eastern Atlantic and the Mediterranean. Vol. 1. UNESCO, Paris, pp. 386–391.

Cohen, D.M., Inada, T., Iwamoto, T. & Scialabba, N. (1990) FAO species catalogue. Gadiform fishes of the world (Order Gadiformes). An annotated and illustrated catalogue of cods, hakes, grenadiers and other gadiform fishes known to date. FAO Fisheries Synopsis, 125, 1–442.

Donlon, C.J., Martin, M., Stark, J., Roberts-Jones, J., Fiedler, E. & Wimmer, W. (2012) The Operational Sea Surface Temperature and Sea Ice Analysis (OSTIA) system. Remote Sensing of Environment, 116, 140–158.

Eschmeyer, W.N. (2014) Catalog of Fishes: GENERA, SPECIES, REFERENCES. Electronic version. Available from: (accessed 1 March 2015)

Facciolà, L. (1887) Sull'esistenza di due forme diverse di Microstoma nel Mar di Messina. Naturalista Siciliano, 6, 193–197.

Francisco, S.M., Robalo, J.I., Stefanni, S., Levy, A. & Almada, V.C. (2014) Gaidropsarus (Gadidae, Teleostei) of the North Atlantic Ocean: a brief phylogenetic review. Journal of Fish Biology, 85, 473–487.

Free Vector Maps (2015) Available from (accessed 31 March 2015)

Gilchrist, J.D.F. (1922) Deep-sea fishes procured by the S.S. “Pickle” (Part 1). Report Fisheries and Marine Biological Survey. Union of South Africa, 2, 41–79.

Greenwood, P.H. & Rosen, D.E. (1971). Notes on the structure and relationships of the alepocephaloid fishes. American Museum Novitates, 2373, 1–41.

IGBP, IOC, SCOR (2013) Ocean acidification summary for policymakers - Third symposium on the ocean in a high-CO2 World. International Geosphere-Biosphere Programme, Stockholm, 22 pp.

Ishiguro, N.B., Miya, M. & Nishida, M. (2003) Basal euteleostean relationships: a mitogenomic perspective on the phylogenetic reality of the “Protacanthopterygii”. Molecular Phylogenetics and Evolution, 27, 476–488.

Jónsson, G. & Pálsson, J. (2013) Islenskir Fiskar (Icelandic fishes). Mál og menning, Reykjavík, 493 pp.

Johnson, D.G & Patterson, C. (1996) Relationships of Lower Euteleostean Fishes. In: Stiassny, M.L.J., Parenti, L.R. & Johnson, D.G. (Eds.), Interrelationships of Fishes, Academic Press Limited, San Diego, pp. 251–332.

Jordan, D.S. & Evermann, B.W. (1896) The fishes of North and Middle America: a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Part I. Bulletin of the United States National Museum, 47, 1–1240.

Jordan, D.S. & Thompson, W.F. (1914) Record of the fishes obtained in Japan in 1911. Memoirs of the Carnegie Museum, 6, 205–313.

Kawaguchi, K. & Butler, J.L. (1984) Fishes of the genus Nansenia (Microstomatidae) with descriptions of seven new species. Contributions in Science, Natural History Museum of Los Angeles County, 352, 1–22.

Kobyliansky, S.G. (1985) Material for the revision of the genus Bathylagus Günther (Bathylagidae): the group of "light" deepsea smelts. Voprosy Ikhtiologii, 25(1), 51–67. [in Russian, English translation in Journal of Ichthyology, 25(2), 1–17]

Kobyliansky, S.G. (1986) Materials for a revision of the family Bathylagidae (Teleostei, Salmoniformes). Transactions of the P.P. Shirshov Institute of Oceanology, 121, 6–50. [in Russian, English summary]

Kobyliansky, S.G. (1990a) Two new species of the genus Bathylagichthys Kobyliansky (Bathylagidae, Salmoniformes) from Southern Hemisphere subpolar waters. Voprosy Ikhtiologii, 30(4), 537–542. [in Russian, English translation in Journal of Ichthyology, 30 (5), 21–27]

Kobyliansky, S.G. (1990b) Taxonomic status of microstomatid fishes and problems of classification of suborder Argentinoidei (Salmoniformes, Teleostei). Trudy Instituta Okeanologii Akademiya Nauk SSSR, 125, 148–177. [in Russian, English summary]

Kobyliansky, S.G. (1992) Two new species of the genus Nansenia (Microstomatidae, Salmoniformes) from the western Indian Ocean. Voprosy ikhtiologii, 32 (2), 3–9. [in Russian, English translation in Journal of Ichthyology, 32 (7), 30–36]

Lavenberg, R.J. (1965) A new species of microstomatid fish (Nansenia) from California waters. Copeia, 3, 281–285.

Lejeusne, C., Chevaldonné, P., Pergent-Martini, C., Boudouresque, C.F. & Pérez, T. (2010) Climate change effects on a miniature ocean: the highly diverse, highly impacted Mediterranean Sea. Trends in Ecology and Evolution, 25, 250–260.

Lloris, D. & Rucabado, J.A. (1985) A new species of Nansenia (N. problematica) (Salmoniformes: Bathylagidae) from the southeast Atlantic. Copeia, 1, 141–145.

MacKenzie, B.R., Payne, M.R., Boje, J., Høyer, J.L. & Siegstad, H. (2014) Title: A cascade of warming impacts brings bluefin tuna to Greenland waters. Global Change Biology, 20 (8), 2484–2491.

Matallanas, J. (1986a) Descriptión de algunas estructuras de interés taxonómico en Nansenia (Pisces, Microstomatidae). Miscellània Zoològica, 10, 233–238.

Matallanas, J. (1986b) Nansenia iberica, a new species of Microstomatidae (Pisces, Salmoniformes). Cybium, 10, 193–198.

Merella, P., Alemany, F., Carbonell, A. & Quetglas, A. (1997) New record of Nansenia iberica (Salmoniformes: Microstomatidae) in western Mediterranean. Cybium, 21, 211–215.

Miya, M. & Nishida, M. (1999) Organization of the mitochondrial genome of a deep-sea fish, Gonostoma gracile (Teleostei: Stomiiformes): First example of transfer RNA gene rearrangements in bony fishes. Marine Biotechnology, 1, 416–426.

Møller, P.R., Nielsen, J.G., Knudsen, S.W., Poulsen, J.Y., Sünksen, K. & Jørgensen, O.A. (2010) A checklist of the fish fauna of Greenland waters. Zootaxa, 2378, 1–84.

Nelson, G.J. (1967) Epibranchial organs in lower teleostean fishes. Journal of Zoology London, 153, 71–89.

Nelson, J.S. (2006) Fishes of the World. 4th Edition. John Wiley & Sons (Inc.), Hoboken, New Jersey, 601 pp.

Poulsen, J.Y. (2015) Fifth confirmed record and North Atlantic range expansion of the rare pelagic bobtail snipe eel genus Neocyema (Cyematidae, Elopomorpha). Marine Biodiversity Records, 8 (e53), 1–5.

Poulsen, J.Y., Byrkjedal, I., Willassen, E., Rees, D., Takeshima, H., Satoh, T.P., Shinohara, G., Nishida, M. & Miya, M. (2013) Mitogenomic sequences and evidence from unique gene rearrangements corroborate evolutionary relationships of Myctophiformes (Neoteleostei). BMC Evolutionary Biology, 13 (111), 1–21.

Poulsen, J.Y., Møller, P.R., Lavoué, S., Knudsen, S.W., Nishida, M. & Miya, M. (2009) Higher and lower-level relationships of the deep-sea fish order Alepocephaliformes (Teleostei: Otocephala) inferred from whole mitogenome sequences. Biological Journal of the Linnean Society, 98, 923–936.

Ratnasingham, S. & Hebert, P.D.N. (2007) BOLD: The Barcode of Life Data System ( Molecular Ecology Notes, 7, 355–364.

Reinhardt, J.C.H. (1840) Om nye Grönlandske fiske. Oversigt over det Kongelige Danske Videnskabernes Selskabs Forhandlinger, 7, 8–10. [1839]

Sutton, T.T., Letessier, T.B. & Bardarson, B. (2013) Midwater fishes collected in the vicinity of the Sub-Polar Front, Mid-North Atlantic Ocean, during ECOMAR pelagic sampling. Deep-Sea Research II, 98, 292-–300.

Usachev, S.G. & Kobyliansky, S.G. (1992) In: Kobyliansky, S.G. (1992) Two new species of the genus Nansenia (Microstomatidae, Salmoniformes) from the western Indian Ocean. Voprosy ikhtiologii, 32 (2), 3–9. [in Russian, English translation in Journal of Ichthyology, 32 (7), 30–36]

Vecchione, M., Bergstad, O.A., Byrkjedal, I., Falkenhaug, T., Gebruk, A.V., Godø, O.R., Gislason, A., Heino, M., Høines, Å.S., Menezes, G.M.M., Piatkowski, U., Priede, I.G., Skov, H., Søiland, H., Sutton, T. & Wenneck, T.L. (2010) Biodiversity Patterns and Processes on the Mid-Atlantic Ridge. In: McIntyre, A.D. (Ed.), Life in the World´s Oceans: Diversity, Distribution, and Abundance. Wiley-Blackwell Publishing Ltd, West Sussex, pp. 103–121.


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