Özak, A.A., T.T. Kurt, S.A. Kamanli, G. Akbulut, A. Yanar & G.A. Boxshall. (2024). Two new species of planktonic Caligus O.F. Müller 1785 (Copepoda: Caligidae) from Türkiye with an updated review and checklist of planktonic caligids. Zootaxa. 5437(3): 301-335.

483548

10.11646/zootaxa.5437.3.1 [view]

Özak, A.A., T.T. Kurt, S.A. Kamanli, G. Akbulut, A. Yanar & G.A. Boxshall

2024

5437(3): 301-335.

Publication

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Two new species of caligid sea lice, Caligus izmiriensis sp. nov., and Caligus sarosensis sp. nov. are described, based on specimens collected from the zooplankton in the Gulf of S & imath;& gbreve;ac & imath;k and the Gulf of Saros off the Aegean Sea coast of T & uuml;rkiye. Detailed examination of the morphology of these two new species and comparisons with other closely related caligid species, especially Metacaligus yucatanensis Su & aacute;rez-Morales, Kim & Escamilla, 2012, resulted in the recognition of the genus Metacaligus Thomsen 1949 as a junior synonym of Caligus O.F. M & uuml;ller, 1785. Based on this proposed synonymy, all species of the genus Metacaligus are here transferred to Caligus: Metacaligus trichiuri (Kr & oslash;yer, 1863), M. rufus (Wilson, 1908), and M. unguidentatus (Rangnekar & Murti, 1950) all return to their original combinations as Caligus trichiuri Kr & oslash;yer, 1863, Caligus rufus Wilson, 1908, and Caligus unguidentatus Rangnekar & Murti, 1950, respectively; Metacaligus yucatanensis Su & aacute;rez-Morales, Kim& Escamilla, 2012, becomes Caligus yucatanensis (Su & aacute;rezMorales, Kim & Escamilla, 2012) comb. nov.; transferring Metacaligus latus Ho & Lin, 2002 would create a secondary homonym of Caligus latus Byrnes 1987, so a replacement name is proposed as Caligus cultellus nom. nov. We recognise C. yucatanensis as a member of the C. undulatus-group. The four other species previously placed in Metacaligus form a cluster which represents a new species group, the Caligus trichiuri-group. An updated list of planktonic caligids is presented, together with keys to species of the C. undulatus-group and of the newly proposed C. trichiuri-group. The subgenus Subcaligus Heegaard, 1943 was originally proposed to accommodate Caligus (Subcaligus) bocki Heegaard, 1943, and was characterised by its unusual stylet-like sternal furca. This subgenus has not been treated as valid by subsequent authors and we here formally propose to treat Subcaligus Heegaard 1943 as a junior synonym of Caligus.

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