Ceratothoa oxyrrhynchaena Koelbel, 1878

Martin, Melissa B., Bruce, Niel L. & Nowak, Barbara F., 2015, Review of the fish-parasitic genus Ceratothoa Dana, 1852 (Crustacea: Isopoda: Cymothoidae) from Australia, with description of two new species, Zootaxa 3963 (3), pp. 251-294 : 281-282

Ceratothoa oxyrrhynchaena Koelbel, 1878

Ceratothoa oxyrrhynchaena Koelbel, 1878: 401 , pl. I, figs. 1 (a–e).— Gerstaecker, 1901: 261.— Avdeev, 1982a: 65; 1982b: 69.— Rokicki, 1984: 132, fig. 33; 1985: 95, tab. 1–3, fig. 6.— Trilles, 1986: 624, tab. 1; 1994: 124; 2008: 23.— Trilles, Radujković & Romestand, 1989: 292, fig. 10.— Horton, 2000: 1045, figs. 5 (a–b).— Huang, 2001: 325.— Yu & Li, 2003b: 267.— Bariche & Trilles, 2005: 5.— Ramdane, Bensouilah & Trilles, 2007: 67.—Pérez-del Olmo, Fernández, Gibson, Raga & Kostadinova, 2007: 152.— Ramdane & Trilles, 2008: 173.— Yamauchi, 2009: 468, figs. 1–2.— Yamauchi & Nunomura, 2010: 72, figs. 3–6.— Martin, Bruce & Nowak, 2013: 401 , figs. 4–6.

Cymothoa oestroides .— Bullar, 1878: 505, pl. 47, figs. 21–22.

Ceratothoa oxyrrhynchoena [lapsus].—Schioedte & Meinert, 1883, 368, tab. XVI (Cym. XXIII) figs. 10–14.

Meinertia oxyrrhynchaena .— Thielemann, 1910: 36 –38, 98–99, figs. 35–36.— Nierstrasz, 1915: 89.— Gurjanova, 1936: 84.— Montalenti, 1948: 51, figs. 18–21, tab. 7, pl. 5.— Euzet & Trilles, 1961: 190.— Quintard-Dorques, 1966: 10.— Trilles & Raibaut, 1971: 74, photo 4.— Trilles, 1973a: 1208, figs. 137–155, pl. 1 (9), pl. 2 (13–14), pl. 3 (21); 1973b: 1250; 1977: 10.— Dollfus & Trilles, 1976: 824.— Capapé & Pantoustier, 1976: 201.— Avdeev, 1978a: 30.— Moreira & Sadowsky, 1978: 100, 111, 113–114, 116, 120.— Yamaguchi, 1993: 193, fig. 20.

Meinertia oxyrhynchaena [lapsus].— Komai, 1927: 1148, fig. 2215.— Iwasa, 1947: 816.

Codonophilus oxyrhynchaenus [lapsus].— Nierstrasz, 1931: 132.— Saito, Itani & Nunomura, 2000: 65.— Tatsu, 2002: 41.

Ceratothoa oxyrhanchaenus [lapsus].— Nunomura, 2006: 36.

Not Cymothoa oestroides .— Bullar, 1878: 505.

Not Meinertia oxyrhynchaena [lapsus].— Yamaguti, 1938: 27.— Iwasa, 1947: 816.

Not Codonophilus oxyrhynchaenus [lapsus].— Shiino, 1965: 544 [= Elthusa Schioedte & Meinert, 1884 ].

Not Ceratothoa oxyrrhynchaena .— Bruce, 1982: 320, figs. 3 (a–k), figs. 4 (d–h).— Yu & Li, 2003a: 224 –227, fig. 2.

Type and type locality. The holotype is deposited at the Naturhistorisches Museum, Vienna ( NHMW reg. 6216; from Sea of Japan, host unknown) ( Horton 2000).

Remarks. Recently redescribed by Martin et al. (2013), Ceratothoa oxyrrhynchaena has a stout, smooth and polished body, cephalon slightly immersed into pereonite 1, smooth posterior margin on pleonite 5, anterolateral projections of pereonite 1 acute and reaching eyes, wide carina on the basis of pereopod 7, posterior margin of pleotelson smooth, uropods shorter than pleotelson length, and males have an appendix masculina on pleopod 2 (Martin et al. 2013; Horton 2000).

The Atlantic and Mediterranean species Ceratothoa collaris (Schioedte & Meinert, 1883) and Ceratothoa oestroides Dana, 1852 are the most similar species to C. oxyrrhynchaena (Martin et al. 2013) . Ceratothoa collaris differs from C. oxyrrhynchaena in the following: slightly nodular dorsal surface, elongate body (2.5 vs. 2.2 as long as wide), irregular pleotelson posterior margin, and males lack an appendix masculina (Martin et al. 2013). Ceratothoa oestroides differs from C. oxyrrhynchaena by having a subtriangular cephalon anterior margin, elongate body, bisinuate or trisinuate posterior margin of pleonite 5 and males do not have an appendix masculina on pleopod 2.

Morphological variation demonstrated by the species from different geographical regions are: Japanese specimens with more developed and subacute anterior margin of cephalon, antennula and antenna of similar size and length, and straight posterior margin of pleotelson; Australian specimens with less prominent anterior margin of cephalon, less wide body and concaved posterior margin of pleotelson; and Mediterranean specimens with prominent anterior margin of pereopod 7 merus, convex posterior margin of pleotelson.

Distribution. Recorded from the western Pacific Ocean ( Koelbel 1878; Nierstrasz 1915; Nunomura 2006; Saito et al. 2000; Schioedte & Meinert 1883; Tatsu 2002; Thielemann 1910; Yamauchi 2009; Yamauchi & Nunomura 2010; Martin et al. 2013), to the north-eastern Atlantic and Mediterranean ( Montalenti 1948; Euzet & Trilles 1961; Quintard-Dorques 1966; Trilles & Raibaut 1971; Trilles 1973b; Capapé & Pantoustier 1976; Trilles 1977; Trilles et al. 1989; Ramdane et al. 2007; Ramdane & Trilles 2008).

Hosts. Host species recorded from Sparidae ( Euzet & Trilles 1961; Quintard-Dorques 1966; Rokicki 1985; Ramdane et al. 2007; Ramdane & Trilles 2008; Martin et al. 2013), Zeidae ( Trilles 1973b) , Rajidae ( Capapé & Pantoustier 1976; Rokicki 1985), Acropomatidae ( Yamauchi 2009; Yamauchi & Nunomura 2010), Scyliorhinidae ( Capapé & Pantoustier 1976) , and Torpedinidae ( Capapé & Pantoustier 1976) .