Gnathia grandilaris Coetzee, Smit, Grutter, & Davies, 2008

Ota, Yuzo, Erasmus, Anja, Grutter, Alexandra S. & Smit, Nico J., 2024, Two new species and new host and distribution records of Gnathia Leach, 1814 (Crustacea, Isopoda, Gnathiidae) from Western Australia and the Great Barrier Reef, Australia, ZooKeys 1193, pp. 125-144 : 125

Gnathia grandilaris Coetzee, Smit, Grutter, & Davies, 2008

Gnathia grandilaris Coetzee, Smit, Grutter, & Davies, 2008: 608, 613, 614, figs 1-26. - Ota and Hirose 2009b, 43, 44, 51, 54, figs 5-7.

Type locality.

Off Lizard Island (14°40'S, 145°27'E), Australia.

Material examined.

Australia • 1♂ (7.1 mm TL, 6.6 mm BL); reared from a juvenile collected from P. sephen (TL and sex, unknown), Heron Island , GBR (23°26'32.9"S, 151°54'53.8"E), 9 July 1998, Ian D. Whittington leg. (QM W29826) .

Remarks.

The original description of G. grandilaris was based on males reared from larvae found infesting a white tip reef shark, Triaenodon obesus ( Rüppell, 1837), and grey reef sharks, C. amblyrhynchos , collected off Lizard Island, GBR ( Coetzee et al. 2008) and subsequently reported from the Ryukyu Islands ( Ota and Hirose 2009b; Ota 2015). The specimen from Heron Island corresponded well with the original description. This record constitutes a new host and a new locality record for G. grandilaris .

Distribution.

Lizard Island and Heron Island, Great Barrier Reef, Australia. Okinawa-jima Island, Kume-jima Island, Ishigaki-jima Island, the Ryukyu Islands, Japan.

Habitat of adults.

Unknown.

Hosts.

Three elasmobranch species from GBR: Triaenodon obesus ( Rüppell, 1837), Carcharhinus amblyrhynchos (Bleeker, 1856), and Pastinachus sephen ( Forsskål, 1775). Seven elasmobranch species from Japan: Himantura sp., Himantura fai Jordan & Seale, 1906, Neotrygon orientalis Last, White & Séret, 2016 [ Neotrygon kuhlii Müller & Henle, 1841 in Ota and Hirose 2009b and Ota 2015], Taeniura meyeni Müller & Henle, 1841, Mobula japanica ( Müller & Henle, 1841), Nebrius ferrugineus (Lesson, 1831), Triaenodon obesus ( Rüppell, 1837), and Negaprion acutidens ( Rüppell, 1837).

Site of infection on host.

Gill chambers, interbranchial septa, gill filaments, and the floor of oral cavities. Rarely nostrils, body surface near the gill slits, or claspers.