Nemesis sp. Risso, 1826

Soler-Jimenez, Lilia C., Morales-Serna, F. Neptali, Aguirre-Macedo, Ma. Leopoldina, McLaughlin, John P., Jaramillo, Alejandra G., Shaw, Jenny C., James, Anna K., Hechinger, Ryan F., Kuris, Armand M., Lafferty, Kevin D. & Vidal-Martinez, Victor M., 2019, Parasitic copepods (Crustacea, Hexanauplia) on fishes from the lagoon flats of Palmyra Atoll, Central Pacific, ZooKeys 833, pp. 85-106 : 85

Nemesis sp. Risso, 1826

Current host.

Carcharhinus melanopterus ( Carcharhinidae ).

Site of infection.

Gills.

Prevalence and mean intensity.

40 and 2 ± 0.1 (n = 5).

Specimens deposited.

CHCM No. 575 (voucher) (1 vial, 1 specimen ♀).

Remarks.

Nemesis is one of 12 genera in the family Eudactylinidae and includes about nine species ( Mangena et al. 2014). Nemesis species can be divided into two groups by the relative width of the cephalothorax, free thoracic segments and genital segments ( Dippenaar et al. 2008). One group (consisting of most of the species) has a fourth free thoracic segment that is much narrower than the preceding three, whereas the other (consisting of N. lamna only) has all four segments of about the same width ( Kabata 1979). The identification and comparison of Nemesis species belonging to the first group is difficult because of morphological variation among individuals and the inconsistencies in the literature ( Hewitt 1969, Kabata 1979).