Lobothorax typus Bleeker, 1857

(Fig. 10 A, B)

Lobothorax typus .— Yu & Bruce, 2006: 643, figs 1–3.— Trilles, 2008: 25.—Rameshkumar, Ravichandran, Sivasubramanian, & Trilles, 2013c: 43, fig 1E.—Anand Kumar, Rameshkumar, Ravichandran, Priya, Nagarajan & Goh, 2015: 208, 209, fig 2b.—Anand Kumar, Rameshkumar, Ravichandran, Nagarajan, Prabakaran & Ramesh, 2017: 57, 58, fig 2g.—Aneesh, Bruce, Kumar, Bincy & Sreenath, 2021a: 3, 4.

Saophra Typus Schioedte & Meinert, 1883: 283, pl. 11 figs. 1, 2.

Saophra auritus Schioedte & Meinert, 1883: 283, pl. 11, figs. 3, 4.

Saophra typus . — Nierstrasz, 1915: 87.— Trilles, 1994: 114.

Lobothorax aurita . — Stebbing, 1893: 353.— Nierstrasz, 1915: 87; 1931: 130.

Type material. Type material not seen; Bleeker (1857) mentions only a single described specimen.

Type locality. Indonesia, western Java Sea, Jakarta Bay .

Type host. Host type unknown.

Material examined. 2 ovig, ♀ (33.55, 19.65 mm TL; 9.88, 7.81 mm W), Bidong Island, Terengganu, (5°36'49.9"N; 103°03'12.9"E), 5 August 2017, in the buccal cavity of Trichiurus lepturus, coll. Melissa B. Martin (UMT Crus 01196, 01197) .

Host. Trichiuridae: large head hairtail Trichiurus lepturus (Linnaeus, 1758) (see Rameshkumar et al. 2013; Anand Kumar et al. 2015, 2017; present study); cutlass fish Lepturacanthus savala (Cuvier, 1829) (see Bleeker, 1857; Yu and Bruce 2006, Rameshkumar et al. 2013).

Distribution. Indonesia, Jakarta (Bleeker 1857; Schioedte & Meinert 1883); China, Hainan Island (Yu & Bruce 2006); Philippines, Ubay (Schioedte & Meinert 1883; Trilles 2008); India, Parangipettai (Rameshkumar et al. 2013c); Peninsular Malaysia, Miri, Sarawak (Anand Kumar’s et al. (2015, 2017) and Bidong Archipelago, Terengganu (present study).

Remarks. Lobothorax typus may be diagnosed by anterolateral margins of pereonite 1 projecting forward beyond the anterior margin of the cephalon; weak dorsal median ridge that runs along pereonites 1–7; pereonites 5–7 abruptly shorter than pereonite 4 (Yu & Bruce 2006). Lobothorax remains a relatively poorly known genus compared to the other buccal-attaching cymothoids, with the three known species recorded having an Indo-Malaysian distribution (Yu & Bruce 2006). Past records specifically indicate that Lobothorax typus has low prevalence when infecting Trichiurus lepturus: 50 of 398 (P=12.6%) from the coast of Parangipettai (Rameshkumar et al. 2013), 1 of 32 (P=3.16 %), and 4 of 10 (P=40%) off the Miri coast Sarawak (Anand Kumar et al. 2015, 2017).