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Identification keys to halosaurs and notacanthids (Notacanthiformes, Elopomorpha) in the subarctic Atlantic Ocean including three new distributional records and multiple molecular OTUs of Notacanthus cf. chemnitzii

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Abstract

As part of an ongoing effort to monitor the fish diversity in Greenland waters using morphological and molecular taxonomy, and construct pragmatic identification keys, we here update distributions of all known halosaurs (Halosauridae) and notacanthids (Notacanthidae) in the subarctic Atlantic Ocean. New distributions are included for Aldrovandia oleosa, Halosauropsis macrochir, and Notacanthus bonaparte, all caught once in the Denmark Strait off SE Greenland. We also present the first observation of luminous tissues in halosaurs. Photo, illustrative and text identification keys are included for pragmatic identification corroborated by molecular barcoding data, produced as part of the Greenland Fishes Barcoding Project (GLF) introduced in this study. Barcoding data revealed five operational taxonomic units (OTUs) of Notacanthus cf. chemnitzii present, including three distinct haplotypes observed off SE Greenland alone, within this species complex currently described as one circumglobal species.

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Abbreviations

SE:

Southeast

SW:

Southwest

NW:

Northwest

NE:

Northeast

OTU:

Operational Taxonomic Unit

MAR:

Mid-Atlantic Ridge

SPF:

Subpolar Front

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Acknowledgements

T. Kawai (Hokkaido University Museum, Japan) for specimen search, A. Bentley (Kansas University, USA) and other identifiers for access to North Atlantic fish barcoding data, I. Eidus & R. Thiel (Zoological Museum Hamburg, Germany) and R. Milne (Atlantic Reference Centre, Canada) for specimen data, E. Johannesen & R. Wienerroither (Institute for Marine Research, Norway) for information, T. Wenneck (Institute of Marine Research, Norway) and A. Orlov (Russian Research Institute of Fisheries and Oceanography, Russia) for MAR-ECO photographs, J. Nielsen and R/V Pâmiut crew (Greenland Institute of Natural Resources, Greenland) for photos and sampling during surveys, M. Krag (Zoological Museum University of Copenhagen, Denmark) for shipping of specimens and information, J. Hlidberg (private, www.fauna.is, Island) for help with illustrations, K. Graham, A. Hay, J. King, M. Lockett, M. McGrouther, K. Parkinson, J.R. Paxton, and S. Reader (Australian Museum, Australia) for help with X-rays, photography, and logistics, D. Barros-García (University of Vigo, Spain) for specimen and sequence information, and K. Sulak (U.S. Geological Survey, USA) and anonymous reviewer for valuable suggestions and comments. We owe a special thanks to I. Byrkjedal and G. Langhelle (Natural History Collections Bergen, Norway) for continuous help with specimens, tissue samples, curating, and providing morphometric/meristic data whenever needed, L. Lindblom (University of Bergen, Norway) for help with molecular work, I. Chemshirova (Zoological Society London, U.K.) for correcting manuscript, and to H. Siegstad (Greenland Institute of Natural Resources) for logistics. This research received no specific grant from any funding agency, commercial, or not-for-profit sectors (part of a larger effort to register biodiversity and facilitate onboard fish identification in Greenland waters).

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Poulsen, J.Y., Thorkildsen, S. & Arboe, N.H. Identification keys to halosaurs and notacanthids (Notacanthiformes, Elopomorpha) in the subarctic Atlantic Ocean including three new distributional records and multiple molecular OTUs of Notacanthus cf. chemnitzii . Mar Biodiv 48, 1009–1025 (2018). https://doi.org/10.1007/s12526-017-0762-8

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