Abstract
Gnathia trimaculata n. sp. is described from one black tip reef shark Carcharinus melanopterus Quoy & Gaimard and four grey reef sharks C. amblyrhynchos Bleeker collected off Lizard Island, Great Barrier Reef, Australia. Third-stage juveniles (praniza 3) were maintained in fresh seawater until they moulted into adults. Male adults emerged seven days post-removal (d.p.r) of pranizae from host fishes, whereas the female pranizae completed their moult into adult females 24 d.p.r. Distinctive features include the relatively large size of all stages and the unique mediofrontal process of the male, which is divided into two lobes forming a key-hole shape between them. The female frontal border is characterised by paired simple, pappose setae on the sides of the mid-dorsal area, as well as four long, pappose setae on the mid-dorsal region. The pranizae have eight teeth on each mandible. Live pranizae have stripes and three pairs of distinctive black spots within yellow circles on the sides of the pereonites and this pigmentation pattern persists in the adults. This represents the second description of a gnathiid parasitising elasmobranchs off Australia.
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Coetzee, M. L., Smit, N. J., Grutter, A. S., & Davies, A. J. (2008). A new gnathiid from Australian sharks Gnathia grandilaris n. sp. (Crustacea, Isopoda, Gnathiidae) parasitizing two species of requiem sharks from Lizard Island, Great Barrier Reef, Australia. Journal of Parasitology, 94, 608–615.
Cohen, B. F., & Poore, G. C. B. (1994). Phylogeny and biogeography of the Gnathiidae (Crustacea: Isopoda) with descriptions of new genera and species, most from South-Eastern Australia. Memoirs of the Museum of Victoria, 54, 271–397.
Froese, R., & Pauly, D. (2008). Fishbase. World Wide Web electronic publication. www.fishbase.org, version (04/2008).
Garm, A. (2004). Revising the definition of the crustacean seta and setal classification systems based on examinations of the mouthpart setae of seven species of decapods. Zoological Journal of the Linnean Society, 142, 233–252.
Grutter, A. S. (1994). Spatial and temporal variations of the ectoparasites of seven coral reef fish from Lizard Island and Heron Island, Australia. Marine Ecology Progress Series, 115, 21–30.
Grutter, A. S., & Poulin, R. (1998). Intraspecific and interspecific relationships between host size and the abundance of parasitic larval gnathiid isopods on coral reef fishes. Marine Ecology Progress Series, 164, 263–271.
Hadfield, K. A., & Smit, N. J. (2008). Description of a new gnathiid, Afrignathia multicavea gen. et sp. n. (Crustacea: Isopoda: Gnathiidae) from South Africa. African Zoology, 42, 81–89.
Heupel, M. R., & Bennet, M. B. (1999). The occurrence, distribution and pathology associated with gnathiid isopod larvae infecting the epaulette shark, Hemiscyllium ocellatum. International Journal for Parasitology, 29, 321–330.
Holdich, D. M., & Harrison, K. (1980). The crustacean isopod genus Gnathia Leach from Queensland waters with description of nine new species. Australian Journal of Marine and Freshwater Research, 31, 215–240.
McKiernan, J. P., Grutter, A. S., & Davies, A. J. (2005). Reproductive and feeding ecology of parasitic gnathiid isopods of epaulette sharks (Hemiscyllium ocellatum) with consideration of their role in the transmission of a haemogregarine. International Journal for Parasitology, 35, 19–27.
Nonumura, N., & Honma, Y. (2004). Gnathia capillata, a new species of the genus Gnathia (Crustacea, Isopoda) from Sado Island, the Sea of Japan. Contributions to Biological Laboratory of Kyoto University, 29, 343–349.
Smit, N. J., & Basson, L. (2002). Gnathia pantherina sp. n. (Crustacea: Isopoda: Gnathiidae), a temporary ectoparasite of some elasmobranch species from southern Africa. Folia Parasitologica, 49, 137–151.
Smit, N. J., Basson, L., & Van As, J. G. (2003). Life cycle of the temporary fish parasite, Gnathia africana (Crustacea: Isopoda: Gnathiidae). Folia Parasitologica, 50, 135–14.
Smit, N. J., & Davies, A. J. (2004). The curious life-style of the parasitic stages of gnathiid isopods. Advances in Parasitology, 58, 290–391.
Smit, N. J., & Van As, J. G. (2002). A new species, Gnathia nkulu sp.n. (Crustacea: Isopoda: Gnathiidae) from southern Africa. Folia Parasitologica, 47, 235–240.
Svavarsson, J. (2006). New species of Gnathiidae (Crustacea, Isopoda, Cymnothoida) from seamounts off northern New Zealand. Zootaxa, 1173, 39–56.
Svavarsson, J., & Jörundsdóttir, K. (2004). A new species (Crustacea, Isopoda, Cymothoida) from Rodrigues, Mauritius, Indian Ocean. Journal of Natural History, 38, 3103–3111.
Tanaka, K. (2005). A new genus and species of gnathiid isopod (Isopoda, Gnathiidae) from the Ryukus, Southwestern, Japan. Journal of Crustacean Biology, 25, 565–569.
Watling, L. (1989). A classification system for crustacean setae based on the homology concept. In B. E. Felgenhauer, L. Watling, & A. B. Thistle (Eds.), Functional morphology of feeding and grooming in Crustacea. Vol. 6. Crustacean issues (pp. 15–26). Rotterdam: A. A. Balkema.
Acknowledgements
Many thanks to the Lizard Island Research Station Staff, Will Robins (James Cook University, School of Marine and Tropical Biology, Townsville) and Tom Lisney (The University of Queensland, School of Biomedical Sciences, Brisbane) for collecting the sharks. This study was funded by an Australian Research Council Discovery Grant and the Sea and Coast II Programme of the National Research Foundation of Southern Africa.
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Coetzee, M.L., Smit, N.J., Grutter, A.S. et al. Gnathia trimaculata n. sp. (Crustacea: Isopoda: Gnathiidae), an ectoparasite found parasitising requiem sharks from off Lizard Island, Great Barrier Reef, Australia. Syst Parasitol 72, 97–112 (2009). https://doi.org/10.1007/s11230-008-9158-2
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DOI: https://doi.org/10.1007/s11230-008-9158-2