Dentex hypselosomus

Iwatsuki, Yukio, Newman, Stephen J. & Russell, Barry C., 2015, Dentex carpenteri, a new species of deepwater seabream from Western Australia (Pisces: Sparidae), Zootaxa 3957 (1), pp. 109-119 : 117

Key to species of the Dentex hypselosomus complex from the western Pacific

1a. Dorsal fin with XIII spines and 9 soft rays................................................... Dentex fourmanoiri

1b. Dorsal fin with XII spines and 10 soft rays................................................................. 2a

2a. Four large fluorescent yellow blotches dorsally below dorsal-fin ray base, plus one iris-sized yellow spot on posteriormost soft dorsal-fin ray base (figs. 1D, 2B of Iwatsuki et al. 2007), clearly visible in oblique dorsal view (fig. 2B of Iwatsuki et al. 2007); 1st and/or 2nd infraorbitals not vivid yellow (silvery reddish); vivid yellow only on snout; anterior margin of scaled region dorsally on head straight or somewhat concave ( Fig. 5 B)......................................... Dentex hypselosomus

2b. No large yellow blotches on back; snout without any prominent vivid yellow coloration or greater yellow part from snout to 1st-2nd infraorbitals; anterior margin of scaled region dorsally on head rounded or pointed ( Fig. 5 A).................. 3a

3a. Five or six bright cobalt lines of small spots (fig. 2A of Iwatsuki et al. 2007) between each horizontal scale row below lateral line, the lines rising obliquely above lateral line, easily recognized in oblique dorsal view (dark brown spots present in preserved specimens); orbit diameter 3.09−4.09 (mean 3.66 in head length)................................. Dentex abei

3b. No bright cobalt lines of small-spots between each horizontal scale row below lateral line; orbit diameter 2.37−3.39 in head length (mean 2.78).................................................................................... 4a

4a. Posterior margin of upper jaw not reaching to or reaching slightly beyond vertical at anterior margin of eye; often wide yellow region on greater part from snout to second infraorbital, often including yellow upper jaw; suborbital depth (9.7–10.9% SL); body (50.0–55.0% SL) in specimens of 100−200 mm SL................................... Dentex carpenteri n. sp.

4b. Posterior margin of upper jaw reaching clearly beyond vertical at anterior margin of eye or reaching beyond anterior margin of iris; no yellow region from snout to infraorbital; suborbital depth shallow (7.6–9.6% SL); relatively deep body (45.5–51.4% SL) in specimens of 100−200 mm SL....................................................... Dentex spariformis

Figures

FIGURE 5. Anterior margin of squamation dorsally on scales of head. A Dentex carpenteri n. sp., WAM P. 33490 - 001, holotype, 219 mm SL, off Ningaloo Reef, near Exmouth, Western Australia; B Dentex hypselosomus, MUFS 17656, 199 mm SL, Meitsu, Miyazaki, Japan. Blue colouration is from Cyanin solution.