Hapalogenys dampieriensis, Iwatsuki & Russell, 2006

Iwatsuki, Yukio & Russell, Barry C., 2006, Revision of the genus Hapalogenys (Teleostei: Perciformes) with two new species from the Indo-West Pacific, Memoirs of Museum Victoria 63 (1), pp. 29-46 : 36-38

Hapalogenys dampieriensis sp. nov.

New English name: Australian Striped Velvetchin

Figures 1B , 2C–D

Hapalogenys kishinouyei .— non Smith and Pope, 1906: Gloerfelt-Tarp and Kailola, 1984: 197, upper 2nd left picture of p. 196 (north-western Australia).− Sainsbury et al., 1985: 214, lowest picture on p. 215 (north-western Australia).− Allen and Swainson, 1988: 82 (north-western Australia).− Allen, 1997: 128 (north-western Australia and south-eastern Asia).− McKay, 2001: 2969 (in part, north-western Australia).− Hutchins, 2001: 34 (Western Australia).

Type material. Holotype: CSIRO C4036-02 , 224 mm SL, north of Cape Lambert , WA, Australia (19°09'S, 117°26− 117°28'E), 121−123 m depth, 1 Sep 1995, coll. A. Graham and G. Yearsley. Paratypes: (all from Australia, n =8): AMS I.22805-035, 3: 66–158 mm SL, North-west Shelf , 170 km N of Port Hedland, WA (18°28'S, 118°15'E), 150– 156 m depth, 28 Mar 1982, coll. J. Paxton and M. McGrouther; NTM S.13569-010, 3: 127−134 mm SL, 104−108 m depth, Arafura Sea , NT, 18 Oct 1992, coll. R . Williams ; CSIRO CA 244, 290 mm SL, north-west of Montebello I., WA (19°58'− 19°57'S, 115°12'− 115°14'E), 10 May 1978, coll. CSIRO; CSIRO CA1552 (voucher specimen based on Sainsbury et al., 1985) , 231 mm SL, north-east of Monte Bello I., WA (19°34'− 19°36'S, 116°09'− 116°12'E), 7 Jun 1980, coll. CSIRO .

Non-type material. 66–300 mm SL, all fromAustralia, n=17. CSIRO H4036-03, 194 mm SL, northern Cape Lambert, WA (19°09'S, 117°26'− 117°28'E), 1 Sep 2002, coll. A. Graham and G. Yearsley; CSIRO H4069-03, 81 mm SL, north-west of Port Hedland, WA (18°38'− 18°39'S, 118°7'− 118°8' E), 8 Sep 1995, coll.A. Graham and G. Yearsley; CSIRO H4069-04, 2: 74−75 mm SL, north-west of Port Headland, WA (18°38'− 18°39'S, 118°7'− 118°8'E), 8 Sep 1995, coll. A. Graham and G. Yearsley; CSIRO CA 1106− CA 1107, 2: both 192 mm SL, off western Admiralty Bay, WA, 9 Nov, 2002; NTM S12819-002, 300 mm SL, Evans Shoal, Timor Sea, NT, 22 Apr 1990, coll. J.Lloyd; NTM S13373-010, 172 mm SL, 87 m depth, Arafura Sea, NT, 30 Oct 1990, coll. NT Fisheries; NTM S.13569-010, 2: 127–129 mm SL, Arafura Sea , NT, 18 Oct 1992, coll. R. Williams; NTM S13523-008 , 169 mm SL , 97−103 m depth, Arafura Sea, NT, 18 Sep 1992, coll. R. Williams, NTM S.13547-002, 65 mm SL, Arafura Sea , NT, 31 Oct, 1992, coll. R. Williams; WAM P25836-002 , 269 mm SL, Bernier I., WA (24°40'S, 112°27'E) , 128−161 m depth; WAM P26194-018 , 166 mm SL, N of Monte Bello I., off Dampier , WA (19°26'S, 116°31'E) , 120−128 m depth; WAM P26195-016 , 97 mm SL, north of Monte Bello I., off Dampier, WA (19°10'S, 116°46'E) , 175−178 m depth; WAM P27244- 002 , 215 mm SL, Rowley Shoals , WA (18°37'S, 119°33'E) , 114 m depth; WAM P30426-001 , 248 mm SL, West of Barrow I., off Onslow, WA (20°40'S, 113°43'E) , 225−230 m depth; WAM P30658-002 , 221 mm SL, 6 miles, NE of Monte Bello I., WA (20°26'S, 115°32'E) ; WAM P30666- 001 , 224 mm SL, Broome , WA (17°58'S, 122°14'E) .

Diagnosis. A species of Hapalogenys with the following combination of characters: fleshy lower lip with dense cluster of very short papillae anteriorly (figs 3C–D), scaly posteriorly (on posterior abdominal part of angular of lower jaws, [fig. 3D]; 10 unobstructed pores on and behind chin (posteriormost 2 sometimes slit-like) (see figs 3C–D; Gloerfelt-Tarp and Kailola, 1984: 197, fig. 2); no scales on maxilla (figs 3C–D); 4 narrow longitudinal dark stripes (2nd and 3rd stripes most distinct, 2nd from nape to base of mid dorsal-fin soft rays, 3rd from eye to last dorsal-fin ray base) in specimens less than about 100 mm SL, thereafter 2nd and 3rd stripes visible only, remainder and 3rd stripes not present in specimens less than about 200 mm SL (figs 1B, 2A–C), their width below base of 5th and 6th dorsalfin spines clearly narrower than pupil diameter (see figs 2A–C in 65–158 mm SL and fig. 1B); 41−45 pored lateral-line scales; soft rayed portions of dorsal and anal fins somewhat truncated posteriorly and slightly angulated posteriorly, respectively (figs 1B, 2A− C); pelvic-fin tip extending slightly beyond anus but clearly not reaching to base of 1st anal-fin spine when depressed (figs 1B, 2A− C); procumbent spine-like process (tip of 1st pterygiophore) apparent at origin of dorsal-fin but covered by predorsal scales.

Description. For the holotype and 5 paratypes, counts and proportional measurements as percentage of SL are given in Table 2. Data for the holotype are presented first, followed by non-type material (if different) in parentheses. Characters given in the diagnosis are not repeated.

Body deep, 45%of SL (42–55% of SL), relatively compressed, covered with ctenoid scales, ctenii free on posterior margin of exposed area; lateral line continuous until on hypural plate; orbit diameter slightly larger than interorbital space; suborbital depth distinctly less than eye diameter; head covered with scales, extending almost to snout tip; lips, chin and ventral part of urohyal naked; cheek and opercle fully scaled; jaws with bands of pointed conical teeth, outermost teeth generally enlarged, but not forming canines; teeth absent on vomer and palatines; preopercle serrate; upper opercle with 2 short spines posteriorly; single notched dorsal-fin; 4th dorsal-fin spine and 2nd dorsal-fin ray longest; 1st dorsal- and anal-fin soft rays not strongly bifurcated; 1st anal-fin spine short, 2nd very robust, longest, clearly longer than 3rd; dorsal and anal fins with high scaly sheath; caudal fin rounded in juveniles, becoming truncate with growth.

Live colouration. Based on a colour photograph in Gloerfert- Tarp and Kailola, 1984: 2nd upper left figure on p. 196, registered as CSIRO CA 1552, 270 mm SL, from north-western Australia − specimen not seen by us and CSIRO C4036-02 , holotype, 234 mm SL: head and body generally pale silvery bronze, usually lighter than in H. kishinouyei (figs 1B, 1E, and 2A–F); dorsal and anal fins translucent or pale brownish; soft dorsal fin pale; pelvic-fin rays and membranes dusky; pelvic-fin spine dark-brownish; iris golden-brown; lips, lower parts of cheek, preopercle, and interopercle pale-brownish .

Preserved colouration. Based on all type specimens: head and body generally dark-brownish; 4 narrow longitudinal brownish pale-brown dark stripes (2nd and 3rd stripes most distinct) in specimens smaller than about 100 mm SL, 2nd and 3rd stripes only present in larger specimens, their width below base of 5th and 6th dorsal-fin spines narrower than pupil diameter (see figs 2A–C in 65–158 mm SL and fig. 1B); pelvic-fin rays, including membrane, dusky; pelvic-fin spine pale-brown; iris, lips, ventral portion of cheek, preopercle, and interopercle brown.

Distribution. Hapalogenys dampieriensis sp. nov. is currently known only from north-western Australia (see fig. 5) in depths of 87− 230 m. The species is likely to have a continuous distribution in similar depths between known localities.

Ecological note. The specific habitat at the collection sites of the type specimens is uncertain, but likely to be dominated by a muddy rocky bottom, similar to that of H. kishinouyei .

Etymology. The name “ dampieriensis ” referstotheDampierian Province (named after the explorer William Dampier), a biogeographic region extending from approximately Geraldton in Western Australia across northern Australia to Cape York, approximating the distribution of the new species in Australia.

Remarks. The largest recorded size of H. dampieriensis sp. nov. is 300 mm SL ( NTM S12819-002), compared with more than 500 mm SL for H. kishinouyei .

Figures

Figure 1. The seven species of Hapalogenys. A), H. analis, MUFS 12258, 185 mm SL, East China Sea; B) H. dampieriensis sp. nov., CSIRO C4036-02, Holotype, 224 mm SL, N of Cape Lambert, north-western Australia; C), H. filamentosus sp. nov., MUFS 7666, holotype, off Iloilo, Panay Is., Philippines; D), Right pelvic-fin (reversed) of H. filamentosus sp. nov., MUFS 7666, holotype; E), H. kishinouyei, MUFS 12316, 266 mm SL, Miyazaki, Kyushu, Japan; F), H. merguiensis, PMBC 10985, paratype, 199 mm SL, off Satun Province near Phuket, Andaman Sea; G), H. nigripinnis, Kanagawa Prefectual Museumʼs photo database (KPM-NR0001009, photographed by T. Suzuki), about 180 mm SL, Moroyose, Hyogo, Sea of Japan; H), H. sennin, MUFS11649, holotype, 232 mm SL, Meitsu, Miyazaki, Japan. Arrow shows tip of pelvic-fin ray.

Figure 2. Three stages of 2 species, Hapalogenys dampieriensis sp. nov. (A–C) and H. kishinouyei (D–F). A), AMS I.22805-035, paratype, 65 mm SL, Northwest Shelf, 170 km off Port Headland, Australia, B), NTM S.13569-010, paratype, 134 mm SL, Arafura Sea, Australia, C), AMS I 22805-035, paratype, 158 mm SL, Northwest Shelf, 170 km off Port Headland, Australia, D) USNM 55610, holotype, 81 mm SL, Tokyo, Japan, E), MUFS 20896, 131 mm SL, Meitsu, Nango, Miyazaki, Japan, F), MUFS 14286, 168 mm SL, Meitsu, Miyazaki. Japan.