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.