Ceratothoa retusa (Schioedte & Meinert, 1883)

Hadfield, Kerry A., Bruce, Niel L. & Smit, Nico J., 2014, Review of the fish parasitic genus Ceratothoa Dana, 1852 (Crustacea, Isopoda, Cymothoidae) from South Africa, including the description of two new species, ZooKeys 400, pp. 1-42 : 4

Ceratothoa retusa (Schioedte & Meinert, 1883)

Ceratothoae retusae Schioedte & Meinert in Hilgendorf 1879: 847 [nomen nudum].

Cteatessa retusa . - Schioedte & Meinert, 1883: 297-299, tab. XI (Cym. XVIII) Figs 11-13; Stebbing 1908: 424; Barnard 1925: 393.- 1940: 491; Nierstrasz 1931: 131; Trilles 1986: 625, tab. 1; 1994: 130; 2008: 23; Kensley 1978: 79-80, Figs 32 ( g–h).

Codonophilus hemiramphi Pillai, 1954: 14-15 [nomen dubium].

Ceratothoa hemiramphi . - Trilles 1994: 120; Kensley 2001: 232.

Ceratothoa retusa . - Bruce and Bowman 1989: 8-12, Figs 5-8; Kensley 2001: 232; Trilles et al. 2011: 446-459; Hadfield et al. in press.

Distribution.

Indian Ocean-records from Mozambique, South Africa, Red Sea, India, Indonesia and northern Australia (see Hadfield et al. in press).

Hosts.

Hemirhamphidae buccal-cavity- Hemirhamphus far ( Forsskål, 1775) and Hemirhamphus robustus Günther, 1866 (see Hadfield et al. in press).

Remarks.

Ceratothoa retusa can be identified by the large pereonite 1 with an anterolateral ridge and small cephalon sunken into pereonite 1. Pereonite 1 is deeply concave with anterolateral margins which almost extend to the tip of the cephalon. The pleotelson is broader than long and the uropods extend past the pleotelson margin ( Hadfield et al. in press). This species was redescribed in detail by Hadfield et al. (in press) and has been shown to have a variable morphology depending on the sampling location of the specimen.