Taxonomic revision of the flathead fish genus Platycephalus Bloch, 1785 (Teleostei: Platycephalidae) from Australia, with description of a new species Author Imamura, Hisashi text Zootaxa 2015 3904 2 151 207 journal article 10.11646/zootaxa.3904.2.1 adefe9de-0ca5-479a-b736-ad242c7f0fe4 1175-5326 233552 CEC37C0D-A25D-43C1-8F3C-127919282F35 Platycephalus orbitalis Imamura & Knapp, 2009 Common English name: Western-Australian flathead ( Fig. 15 ) Platycephalus orbitalis Imamura & Knapp, 2009 : 58 , figs. 1–5 ( type locality: northwest of Rottnest Island, WA, Australia ). Platycephalus marmoratus (not Stead, 1908 ): Hutchins & Thompson, 1983 : 78 , fig. 112; Hutchins & Swainston, 1986 : 127 , fig. 204 (in part); Paxton & Hanley, 1989 : 469 (in part); Knapp, 1991 : 29 , tab. 3 (in part); Hutchins, 2001 : 28 ; Hoese et al ., 2006 : 943 (in part). FIGURE 15. (A) Dorsal and (B) lateral views of Platycephalus orbitalis , CSIRO H 6349-04, holotype, 267 mm SL, northwest of Rottnest Island, WA. Material examined. Holotype : CSIRO H 6349-04, 267 mm SL , northwest of Rottnest Island, WA, Australia ( 31°52.56’S , 115°18.30’E – 31°52.60’S , 115°18.49’E ), 100–102 m depth, 10 Apr. 2006 . Paratypes : 6 specimens , 236–333 mm SL , from western Australia , listed in Imamura & Knapp (2009) . Other specimen ( 1 specimen , 337 mm SL , from northwestern Australia ): WAM P.27606-001, 337 mm SL , WA ( 32°03’S , 115°44’E ), 28 March 1982 . Diagnosis. A species of Platycephalus with the following combination of characters: dorsal- and anal-fin rays 13; pored lateral-line scales 65–68, all lacking spines; gill rakers 2 + 6–7 = 8–10; snout and interorbit naked; interopercular flap absent; margin of interopercle scalloped; upper jaw without large caniniform teeth; fleshy sensory tubes from infraorbitals and preopercle well developed, covering cheek region, except anteroventrally; head and body lacking distinct large spots and bands dorsally; caudal fin blackish with a pale posterior margin. Description. A full description was given by Imamura & Knapp (2009) . Distribution. Known only from western Australian waters, from Cape Leeuwin (34°S) north to Cape Cuvier (24°S) (e.g., Hutchins, 2001 ; Imamura & Knapp, 2009 ; this study). Size. Known maximum length 337 mm SL ( 400 mm TL) ( Imamura & Knapp, 2009; this study ). Remarks . Although Imamura & Knapp (2009) described the holotype as having 2 + 4 = 6 gill rakers, reexamination has confirmed the number as 2 + 6 = 8. The present species is mostly similar to P. marmoratus (see Remarks for P. marmoratus ).