Parasitology Research

, Volume 117, Issue 11, pp 3497–3505 | Cite as

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

  • Sara Dallarés
  • María ConstenlaEmail author
  • Maite Carrassón
Original Paper


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.


Parasite Hamaticolax Copepod Bomolochidae Helicolenus dactylopterus Mediterranean 



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.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Departament de Biologia Animal, Biologia Vegetal i EcologiaUniversitat Autònoma de BarcelonaBarcelonaSpain

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