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Description of a new species of Neoargestes Drzycimski, 1967 (Copepoda, Harpacticoida, Argestidae) from the Clarion Clipperton Fracture Zone (Pacific Ocean), with remarks on the systematics of the genus

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Abstract

Neoargestes laevis sp. nov. (Copepoda, Harpacticoida, Argestidae), the third species of the genus, is described from the Clarion Clipperton Fracture Zone (Pacific Ocean), and a re-description of the holotype of Neoargestes incertus Becker, 1979 is provided. The generic diagnosis of Neoargestes Drzycimski, 1967 is amended and its allocation to Argestidae is confirmed. The monophyly of Neoargestes is recognized by six autapomorphies: transformation of the mandibular gnathobase into a strong masticating apparatus with a broad front, reduction in size of the first endopodal segment in P2–P4, and reduction in size of the P5 baseoendopod and exopod. The presence of 3-segmented endopods in P2–P4 in Neoargestes points to a rather basal position of the genus within Argestidae. Its affinities to Argestinae, Bodinia George, 2004 and Odiliacletodes Soyer, 1964 as well as its intrageneric systematics are briefly discussed.

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Acknowledgments

The authors are grateful to Dr. Dirk Brandis and Lina Rosotta (Kiel Museum, Germany) for lending the type material of Neoargestes incertus. Jon Anders Kongsrud (University of Bergen, Museum of Zoology, Norway), Dr. Thorolf Magnesen and Dr. Torleiv Brattegard (Espegrend Marine Research Field Station), and Dr. Teresa Radziejewska (University of Szczecin, Poland) are kindly thanked for providing information about the Neoargestes material of Dr. I. Drzycimski. Dr. Vicky Kalogeropoulou (Hellenic Centre of Marine Research, Greece) is kindly thanked for allowing to study her specimens of Neoargestes.

Thanks are also due to the captain and the crew of the RV ‘Mt. Mitchell,’ François Charlet (GSR), Tom De Wachter (GSR), Niels Viaene (Marine Biology Research Group, UGent), Dr. Freija Hauquier (Marine Biology Research Group, UGent), Liesbet Colson (Marine Biology Research Group, UGent), Dr. Ellen Pape (Marine Biology Research Group, UGent), Alison Proctor (OFG), Phil and Tony Wass (OFG), and Nick Eloot (G-TEC) for their help during the GSRNOD15A expedition. The authors are grateful to Annick Van Kenhove, Guy De Smet and Dr. Ellen Pape (Marine Biology Research Group, UGent) for their help during sample processing. Special thanks go to Dr. Natalie Barnes (United Kingdom) for reviewing the English text of the manuscript. We are indebted to three anonymous reviewers for their helpful and constructive comments and recommendations.

Funding

The environmental baseline survey in the GSR license area is supported by a service arrangement between the private company Global Sea Mineral Resources N.V. and Ghent University.

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Authors and Affiliations

  1. Marine Biology Research Group, Biology Department, Ghent University, Krijgslaan 281 – S8, 9000, Ghent, Belgium

    Hendrik Gheerardyn

  2. German Centre for Marine Biodiversity Research (DZMB), Senckenberg am Meer Wilhelmshaven, Südstrand 44, 26382, Wilhelmshaven, Germany

    Kai Horst George

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  1. Hendrik Gheerardyn
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Correspondence to Hendrik Gheerardyn.

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Neoargestes laevis is registered in ZooBank under urn:lsid:zoobank.org

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Communicated by L. Menzel

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Gheerardyn, H., George, K.H. Description of a new species of Neoargestes Drzycimski, 1967 (Copepoda, Harpacticoida, Argestidae) from the Clarion Clipperton Fracture Zone (Pacific Ocean), with remarks on the systematics of the genus. Mar Biodiv 49, 1891–1912 (2019). https://doi.org/10.1007/s12526-019-00951-1

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