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A new species of Hamaticolax (Copepoda: Bomolochidae) from Helicolenus dactylopterus (Delaroche, 1809) (Scorpaeniformes: Sebastidae) in NW Mediterranean deep waters and notes on patterns of host use and host-specificity of the genus

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Abstract

Hamaticolax juanji n. sp. is described from specimens collected from the blackbelly rosefish Helicolenus dactylopterus Delaroche 1809 (Scorpaeniformes: Sebastidae). It is the second Hamaticolax species described and reported from the Mediterranean Sea, after Ha. resupinus Pérez-i-García, Carrassón and Boxshall, 2017. It is distinguished from Ha. resupinus by the presence of only one dorsal naked seta on the third segment of the antennule (vs. four), two unequal short naked setae in distal part of the antenna (vs. four), and the absence of a minute spine on the third endopodal segment of leg 1, among others. It is differentiated from Ha. prolixus Cressey 1969 by a comparatively reduced fourth pedigerous somite, the presence of two naked setae on the third segment of the antennule (vs. three), two naked setae and three curved claws in the distal part of the apical segment of the antenna (vs. three and four), an outer naked seta on the basis of leg 2, and by larger length/width ratio of the third endopodal segment, among others. Hamaticolax juanji n. sp. also has relatively longer inner setae on the first and second endopodal segments of leg 4 than the two former species. Patterns of host-use and host-specificity of the genus Hamaticolax are also discussed. The frequently observed low host-specificity of its members may be better explained by host ecological similarity and host availability phenomena, rather than by host phylogenetic distance.

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Acknowledgements

Special thanks goes to Prof. Geoff Boxshall (Natural History Museum, London, UK) for his help, advice, and useful comments on the manuscript. We are grateful to the student A. Caro for her collaboration in the dissection of the hosts and preliminary examination of the copepods. This study was supported by the Spanish Ministry of Science and Innovation (MICYT) projects BIOMARE (CTM2006-13508-C02-01MAR) and ANTROMARE (CTM2009-12214-C02-01, CTM2009-12214-C02-02), and we thank all participants in the cruises of these projects.

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Authors and Affiliations

  1. Departament de Biologia Animal, Biologia Vegetal i Ecologia, Universitat Autònoma de Barcelona, 08193, Barcelona, Spain

    Sara Dallarés, María Constenla & Maite Carrassón

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  1. Sara Dallarés
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  2. María Constenla
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  3. Maite Carrassón
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Correspondence to María Constenla.

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Dallarés, S., Constenla, M. & Carrassón, M. A new species of Hamaticolax (Copepoda: Bomolochidae) from Helicolenus dactylopterus (Delaroche, 1809) (Scorpaeniformes: Sebastidae) in NW Mediterranean deep waters and notes on patterns of host use and host-specificity of the genus. Parasitol Res 117, 3497–3505 (2018). https://doi.org/10.1007/s00436-018-6047-8

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