Redescription of Caligus pagelli Delamare Deboutteville & Nun ˜ es-Ruivo, 1958 (Copepoda: Caligidae) on the common pandora, Pagellus erythrinus (Linnaeus), in western Mediterranean waters off Corsica, France Argun Akif O ¨ zak . Sonia Ternengo . Geoffrey Allan Boxshall Received: 14 February 2018 / Accepted: 12 May 2018 Ó Springer Science+Business Media B.V., part of Springer Nature 2018 Abstract Caligus pagelli Delamare Deboutteville & Nun ˜es-Ruivo, 1958, a rare and poorly known sea louse, is redescribed based on newly collected spec- imens of both sexes. The new material was collected from the common pandora Pagellus erythrinus (Lin- naeus) caught in western Mediterranean waters off Corsica. The original and only available description of C. pagelli was incomplete and based only on females. Here we redescribe the female in detail, and describe the male for the first time. Introduction The common pandora Pagellus erythrinus (Linnaeus) (Sparidae) is one of the most abundant and commer- cially important fish species in the Mediterranean (Metin et al., 2011; Mahdi et al., 2018). In addition, this fish is one of the most promising candidate species for marine aquaculture due to its high market value (Klaoudatos & Klaoudatos, 2004; Valde ´s et al., 2004). Successful commercialization of common pandora aquaculture will require improved knowledge of diseases and the development of management strate- gies to mitigate risks from parasites and diseases. Unfortunately, P. erythrinus hosts the greatest diver- sity of parasitic copepods of all Mediterranean sparid species (Raibaut et al., 1998). To date, 15 valid species of parasitic copepods belonging to 11 genera have been reported from P. erythrinus (Table 1). Two of these species, Caligus diaphanus von Nordmann, 1832 and C. pagelli Delamare Deboutteville & Nun ˜es-Ruivo, 1958 are sea lice, members of the family Caligidae Burmeister, 1835, which can cause heavy infestations on cultured marine fishes resulting in high mortalities (Johnson et al., 2004;O ¨ zak et al., 2017). Therefore, these two sea lice species should be considered as potential disease threats to the develop- ing cultivation of P. erythrinus. Caligus diaphanus is a well known and widely distributed species which has been recorded from fishes belonging to numerous families including the Carangidae, Gadidae, Latidae, Lutjanidae, This article is part of the Topical Collection Arthropoda. A. A. O ¨ zak (&) Department of Fish Diseases and Aquaculture, Faculty of Fisheries, University of C ¸ ukurova, 01330 Adana, Turkey e-mail: ozargun@gmail.com S. Ternengo Universite ´ de Corse Pasquale Paoli, UMR 6134 CNRS- UCPP Sciences pour l’Environnement, 20250 Corte, France S. Ternengo Universite ´ de Corse Pasquale Paoli, UMS 3514 CNRS- UCPP Plateforme marine Stella Mare, 20620 Biguglia, France G. A. Boxshall Department of Life Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK 123 Syst Parasitol https://doi.org/10.1007/s11230-018-9799-8