Abstract
Deep-sea cephalopods are important in the bathyal ecosystems in terms of both abundance and diversity, but are seriously understudied. One of the most intriguing groups among the deep-sea cephalopods are Cirrata, relatively primitive octopods. Opisthoteuthis is the largest genus among the Cirrata. The least studied species of Opisthoteuthis in the Atlantic, Opisthoteuthis borealis Collins, 2005 was known from nine specimens only prior to our study, and nothing was described about its biology. Four males, all larger than the previously known maximum size (mantle length 78–96 mm cf. 75 mm), are described and COI sequence of the species provided to ease the identification of the Atlantic Opisthoteuthis. Our findings expand the known geographical (North Atlantic from 60° N northward and up to the Davis and Denmark Straits and the Iceland–Faroe Ridge), depth (878–1321 m) and temperature (3.0–3.6 °C) ranges of O. borealis. Arm bifurcation is reported in Cirrata for the first time, suggesting well-developed regeneration is present even in this ancient taxon of cephalopods. Ontogenetic increase of spermatophore length, i.e., when the spermatophores produced later during ontogenesis are larger than those produced earlier, is reported in Cirrata for the first time. The stomachs in all the studied specimens were at least one-third full, suggesting that O. borealis continues to feed and grow after reaching maturity. Polychaetes dominated over crustaceans in the stomach contents. Contrary to the assumption that Cirrata feed on relatively small prey only, large mature males of O. borealis consume polychaetes reaching 41.5–45.9% ML of the specimens.
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Acknowledgements
We are grateful to ‘Initiating North Atlantic Benthos Monitoring (INAMon)’ project and BIOICE programme for providing parts of the samples, to the scientific groups and crews of the mentioned vessels, to T. P. Satoh (The Kyoto University Museum) for help with molecular works. INAMon was financially supported by the Greenland Institute of Natural Resources, North Atlantic Cooperation (nora.fo; J. nr. 510-151), Sustainable Fisheries Greenland, the Ministry for Research in Greenland (IKIIN) and the Environmental Protection Agency (Dancea) of the Ministry of Environment and Food of Denmark (J. nr. mst-112-00272). This research is also part of the Danish Presidency project in Nordic Council of Ministers, mapping seabed biodiversity and vulnerability in the Arctic and North Atlantic. We thank two anonymous reviewers of the manuscript and the editor Dr. Mike Vecchione for their valuable comments and suggestions to improve the quality of the paper.
Funding
This study is part of Initiating North Atlantic Benthos Monitoring, INAMon, which was financially supported by the Greenland Institute of Natural Resources, North Atlantic Cooperation (nora.fo; J. nr. 510-151), Sustainable Fisheries Greenland, the Ministry for Research in Greenland (IKIIN) and the Environmental Protection Agency (Dancea) of the Ministry of Environment and Food of Denmark (J. nr. mst-112-00272). This research is also part of the Danish Presidency project in Nordic Council of Ministers, mapping seabed biodiversity and vulnerability in the Arctic and North Atlantic. A.V.G. and G.G. acknowledge the financial support received from the BIOICE programme.
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All relevant data are included in the paper and/or in the supplementary information. Specimens are kept in the Greenland Institute of Natural Resources (PA-2017-7-68 and HM-2019-4-16) and the Icelandic Institute of Natural History (NI-21). A sequence of COI is openly accessible from GenBank (https://www.ncbi.nlm.nih.gov/genbank/) under accession number LC573902.
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A.V.G. and R.M.S. designed the study; A.V.G., M.E.B., G.G., I.E.M. and D.V.Z. collected or provided the samples; A.V.G. and R.M.S. analysed the samples and respective data; J.Y.P. did molecular genetics part of the work; A.V.G., J.Y.P. and R.M.S. wrote the first draft of the paper; all authors were involved in interpreting the results and contributed to the final draft of the paper.
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Golikov, A.V., Blicher, M.E., Gudmundsson, G. et al. Flapjack devilfish in the northern North Atlantic: morphology, biology and ecology of Opisthoteuthis borealis (Cephalopoda, Octopoda, Cirrata). Mar. Biodivers. 50, 108 (2020). https://doi.org/10.1007/s12526-020-01138-9
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DOI: https://doi.org/10.1007/s12526-020-01138-9