Two new species of planktonic Caligus O. F. Müller 1785 (Copepoda: Caligidae) from Türkiye with an updated review and checklist of planktonic caligids Author Özak, Argun Akif 0000-0001-6743-4178 Department of Fish Diseases, Faculty of Fisheries, University of Çukurova, 01330 Sarıçam, Adana, Türkiye ozargun@cu.edu.tr Author Kurt, Tuba Terbiyik 0000-0002-2937-6816 Department of Basic Sciences, Faculty of Fisheries, University of Çukurova, 01330 Sarıçam, Adana, Türkiye tterbiyik@cu.edu.tr Author Kamanli, Seyit Ali 0000-0002-9118-4591 Department of Biology, Faculty of Art and Science, Burdur Mehmet Akif Ersoy University, Burdur 15030, Türkiye alikamanli06@gmail.com Author Akbulut, Gürkan 0000-0002-2937-6816 Department of Basic Sciences, Faculty of Fisheries, University of Çukurova, 01330 Sarıçam, Adana, Türkiye tterbiyik@cu.edu.tr Author Yanar, Alper 0000-0002-9293-7647 Department of Marine Sciences, Faculty of Marine Sciences and Technology, Iskenderun Technical University, Iskenderun-Hatay 31200, Türkiye alperynr@gmail.com & alper.yanar@iste.edu.tr Author Boxshall, Geoffrey A. 0000-0001-8170-7734 Department of Life Sciences, Natural History Museum, Cromwell Road, London SW 7 5 BD, U. K. g.boxshall@nhm.ac.uk text Zootaxa 2024 2024-04-15 5437 3 301 335 http://dx.doi.org/10.11646/zootaxa.5437.3.1 journal article 294422 10.11646/zootaxa.5437.3.1 6c295c3c-1b9e-4ea6-9d17-4005b99c5a5b 1175-5326 10984877 F06B9D4F-B890-41E2-AC14-9C7DD717DFE8 Updated key to species of Caligus undulatus -group (females only) 1. Distal segment of antennule short (less than 2.5 times length of proximal segment)................................. 2 - Distal segment of antennule elongate (about 2.5 times length of proximal segment)....................... C. longiramus 2. Sternal furca present................................................................................... 3 - Sternal furca absent.............................................................. C. yucatanensis comb. nov. 3. Genital complex at least 3 times longer than abdomen................................................ C. evelynae - Genital complex less than 3 times longer than abdomen....................................................... 4 4. Postantennal process with accessory tine on base part......................................... C. sarosensis sp. nov. - Postantennal process simple, lacking accessory tine.......................................................... 5 5. Sternal furca with tines closely adpressed along midline...................................... C. izmiriensis sp. nov. - Tines of sternal furca clearly separated.................................................................... 6 6. Abdomen distinctly 2-segmented and about as long as genital complex.................................... C. chelifer - Abdomen 1-segmented and shorter than genital complex...................................................... 7 7. Abdomen more than 2 times longer than wide...................................................... C. undulatus - Abdomen less than 2 times longer than wide................................................................ 8 8. Dorsal cephalothoracic shield subtriangular, with straight lateral margins................................ C. tripedalis - Dorsal cephalothoracic shield rounded, with evenly convex lateral margins................................ C. ogawai