Ceratothoa carinata ( Bianconi, 1869 )

Martin, Melissa B., Tuah, Alia, Muhamad, Juariah H. & Bruce, Niel L., 2022, A review of the family Cymothoidae (Isopoda: Cymothooidea) infesting marine fishes from Malaysian waters, with new host and geographical records, Zootaxa 5222 (1), pp. 1-36 : 8-9

Ceratothoa carinata ( Bianconi, 1869)

( Fig. 4 A–D )

Cymothoa (Ceratothoa) carinata .— Hilgendorf, 1879: 846.

Ceratothoa carinata .— Schioedte & Meinert, 1883: 327–329, pl. XIII (Cym. XX) figs 1–2.— Trilles, 1986: 623, tab. 1; 1994: 116–117; 2008: 23.— Kensley, 2001: 232.— Bruce, 2007: 278.— Martin, Bruce & Nowak, 2013: 397–401 , figs 1–3.— Nagasawa, Fukuda & Nishiyama, 2014: 59–61, fig. 1.— Martin, Bruce & Nowak, 2015a: 266–267 .— Hadfield, Bruce & Smit, 2016: 48–51 , fig. 3.

Ceratothoa curvicauda Nunomura, 2006: 36–38 , figs 12–13.

Ceratothoa sp. — Saito 2009: 7–9, photos 1–2.

Type material. Female neotype, South African Museum, Cape Town ( SAMC-A085795 ); three female paratypes ( SAMC-A085796 ) (see Hadfield et al. 2016) .

Type locality. Maputo Bay , Mozambique ( Hadfield et al. 2016) .

Type host. From the buccal-cavity of Selar crumenophthalmus (Bloch, 1793) ( Hadfield et al. 2016) .

Material examined. 2 ♀ ovig. (33, 32 mm TL; 8, 8 mm W), LKIM Besut , Terengganu, 05°49.872’N; 102°33.714’E, 3 February 2020, from buccal cavity of shortfin scad ( Decapterus macrosoma ), coll. Norshida Ismail ( UMT Crus 01162, 01163) .

Host. Predominantly Carangidae , less often Lutjanidae : [ Lutjanus adetii (Castelnau, 1873) (previously Lutjanus amabilis ) ( Trilles1972b;c)]; Pseudocaranx dentex (Bloch& Schneider, 1801) (see Nunomura 2006); Decapterus muroadsi (Temminck & Schlegel, 1844) (see Nunomura 2006 Saito 2009, Nagasawa et al. 2014); S elar crumenophthalmus (Bloch, 1793) (see Martin et al. 2013) and Decapterus macrosoma (Bleeker, 1851) (present material).

Distribution. Western Indian Ocean and the Pacific Ocean: Mozambique ( Bianconi 1869, Hilgendorf 1879, Schioedte & Meinert 1883, Hadfield et al. 2016); Seychelles ( Stebbing 1910); New Caledonia ( Trilles 1972b, c; Bruce 2007); Red Sea ( Trilles 2008); Japan ( Nunomura 2006; Saito 2009, Nagasawa et al. 2014); Australia ( Martin et al. 2013); and Malaysia (present material).

Remarks. Ceratothoa carinata is a new record for Malaysian waters and identified by a medial ridge extending longitudinally along dorsal pereon surface; pleotelson laterally depressed, wider than long, with concave posterior margin; pereonite 7 with enlarged carinate ischium and enlarged bulbous protrusion on merus; uropods reaching distal edge of pleotelson ( Martin et al. 2015a). Ceratothoa trigonocephala ( Leach, 1818) and Ceratothoa trillesi ( Avdeev, 1979b) are similar to Ceratothoa carinata , but both have narrow pleonite 1; shorter pleotelson with generally convex posterior margin, smooth, convex dorsum; pereopod 7 lacks enlarged ischium.

Bianconi (1869) described this species from a single ovigerous female from Mozambique without stating a location or place of type deposition. Schioedte and Meinert (1883) later mentioned a specimen from the type locality deposited in the Zoologisches Museum, Museum f̧r Naturkunde, Homboldt-Universität in Berlin, Germany. Hadfield et al. (2016) made enquiries at the Zoologisches Museum, Berlin, the Muséum national d’Histoire naturelle, and the Natural History Museum in London regarding the whereabouts of the type specimen, but to no avail. Following the International Code of Zoological Nomenclature in in the interests of nomenclatural stability Hadfield et al. (2016), designated a new specimen from the type locality as a neotype and deposited it into the South African Museum, Cape Town.

Figures

FIGURE 4. Ceratothoa carinata (Bianconi, 1869). A, dorsal view; B, ventral view, ovigerous female (33 mm), (UMT Crus 01162); C, dorsal view; D, ventral view, non-ovigerous female (32 mm), (UMT Crus 01163). Scale: 5 mm.