Gynacantha dobsoni Fraser, 1951

Theischinger, Gunther, Marinov, Milen, Bybee, Seth, Jensen, Colin, Theuerkauf, Jörn & Rashni, Bindiya, 2020, The genus Gynacantha Rambur, 1842 in the South Pacific (Odonata: Anisoptera: Aeshnidae), Zootaxa 4778 (1), pp. 171-195 : 175-176

Gynacantha dobsoni Fraser, 1951

( Figs 4 , 13 , 22 , 27, 34a, 34b, 36c, 36d, 36i, 36j)

Gynacantha dobsoni Fraser, 1951: 307 .

Lectotype ♂: Dunk Island , Great Barrier Riff, Qld ( ANIC); seen.

Material studied. New Caledonia. La Foa : 1 ♂ found dead in a supermarket, 2018 ( NZAC) ; dry forest of Tiéa , 21°07’S / 164°57’E, Malaise trap 8668: 1 ♂ 4–5 November 2001, C. Burwell leg. ( QM) ; Dumbéa : 1 ♀ (2246), 15 May 1984, D.A.L. Davies leg. ( CUMZ) ; Hienghène or Dumbéa: 1 ♂ (2247), 1984 (1981) ( CUMZ) ; Hienghene : 2 ♀♀ (2248), 1 ♂ (2249), 28 November 1981, ( CUMZ) ; Hienghène : 2 ♀♀ (2252, 2256), 30 November 1981, D.A.L. Davies leg. ( CUMZ) ; 1 ♀, 2 December 1944, Wilfred Crabb (SI); Dumbéa Rd : 1 ♂ (2250), 15 April 1984, D.A.L. Davies leg. ( CUMZ) ; Lifou Island , Cap des Pins: 2 ♂♂ (2251, 2254), 13 November 1990, 1 ♂ (2253), 18 November 1990 ( CUMZ) ; Koné : 1 ♀ (2255), 1983, D.A.L. Davies leg. ( CUMZ) . North Queensland. “11 Mile Scrub”, 19 km W of Moreton, Cape York Peninsula: 1 ♀, 1–2 July 1975, G.B. Monteith leg. ( AM) ; Cairns : 1 ♀, E. Allen leg. ( AM) ; Claudie River , Iron Range: 1 ♀, 21 September 1974, M.S. Moulds leg., 1 ♀, 8 October 1974, G. Daniels leg. (both AM) ; Dalhunty River xing, Cape York Peninsula: 1 ♂, 8 October, M.S. & B.J. Moulds leg. ( AM) ; Gordon Creek , Iron Range: 1 ♂, 26 April 1975, 2 ♂♂, 7 May 1975, 1 ♂, 1 ♀, 10 May 1975, M.S. Moulds leg. ( AM) ; 7km N of Hope Vale Mission (15.14°S / 145.07°E): 1 ♂, 4 October 1980, T. Weir leg. ( AM) ; Iron Range , Cape York Peninsula: 1 ♀, 26 May–2 June 1971, B. Cantrell leg. ( AM) ; Iron Range , Cape York Peninsula: 1 ♀, 30 June–4 July 1977, G.B. Monteith leg. ( AM) ; Julatten : 1 ♀, January 1968 ( AM) ; Lankelly Creek , McIlwraith Range nr Coen, 1 ♀, 28–31 Oc- tober 1969, B. Cantrell leg. ( AM) ; Lizard Island NNE of Cooktown: 1 ♀, 20 November 1974, M.S. & B.J. Moulds leg. ( AM) ; Mid Claudie River , Iron Range: 1 ♂, 27 August 1974, 8 m, 1 ♀, 30 August 1974, A. & G. Daniels leg. ( AM) ; Middle Claudie River , Iron Range: 1 ♀, 12 October 1974, 1 ♀, 18 October 1974, 1 ♀, 8 October 1974, 8 ♂♂, 11 November 1974, 2 ♂♂, 1 ♀, 15 November 1974, 1 ♂, 17 November 1974, 1 ♂, 19 November 1974, 1 ♂, 2 ♀♀, 20 November 1974, all M.S. Moulds leg. ( AM) ; Mt Lomond , Iron Range: 1 ♀, 19 Sepember 1974, M.S. Moulds leg. ( AM) ; 3 km NE of Mt Webb (15.03°S / 145.09°E): 1 ♀, 1–3 October 1980, T. Weir leg. ( AM) ; N camp Beagle , 45 km N Aurukun: 1 ♀, 18–25 November 1981, M. Robinson leg. ( AM) ; Peach Creek , 25 km NNE Coen: 1 ♀, 2 November 1979, 1 ♂, 3 November 1979, M.S. & B.J. Moulds leg. ( AM) ; Rocky River , McIlwraith Range via Coen: 1 ♀, 6–8 November 1969, B. Cantrell leg. ( AM) ; Station Creek , N of Mareeba: 1 ♂, 30 October 2004, 1 ♂, 7 No- vember 2004, both L. Mueller leg. ( AM) ; Stewart River xing, S of Coen: 1 ♂, 7 October 1979, M.S. & B.J. Moulds leg. ( AM) ; Tozer Gap nr Iron Range: 2 ♂♂, 18 October 1974, M.S. Moulds leg. ( AM) ; Upper Jardine River , Cape York Peninsula: 11°17’S / 142°35’E: 1 ♀, 23 October 1979, M.S. & B.J. Moulds leg. ( AM) ; West Claudie River , Iron Range: 4 ♂♂, 4 ♀♀, 13 September 1974, 2 ♂♂, 6 ♀♀, 16 September 1974, 1 ♂, 1 ♀, 23 September 1974, 1 ♂, 8 October 1974, all M.S. Moulds leg. ( AM) .

South Queensland. Caloundra, Ring Tank : 1 ♂, December 1998, A.G. Orr (A.G. Orr, private collection) .

Northern Territory. Darwin : 1 ♂, 25 August 1974, L. Oosterweghel leg. ( RMNH) .

Western Australia. Kings Cascades, Prince Regent River : 1 ♂, 2 ♀♀, 17 August 1994, L. Mueller leg. ( ANIC) .

Distribution. North and north-east of Australia, New Caledonia.

Diagnostic characters: Postfrons with dark T-mark. Both Hw with space between CuP and A1 basally not expanded and without double cells in proximal half. Generally more than 10 denticles along genital fossa rather close to it, rather regularly spaced and often not restricted to posterior portion. Superior anal appendages very slender, almost straight, clubbed, with apical portion approximately 1.5 times basal width and with apex narrowly curved postero-laterally into a moderately long acute point; inferior anal appendage distinctly shorter than 1/3 the length of superiors, with lateral edges of basal portion convex and rather abruptly narrowing into a distinctly tapered apical portion.

Generally distinguished from G. rosenbergi , with which it overlaps in Australia, by (1) having more denticles (8–30) along genital fossa that are often not restricted to the posterior part, (2) straighter, more sharply pointed superior anal appendages and (3) by the shorter, more distinctly tapered apical portion of the shorter inferior appendage. Distinguished from G. amphora , with which it probably does not overlap in range, by (1) only 2 rows of cells between anal triangle and anal loop in Hw, (2) by lack of a pale mid-dorsal pattern element in S2 and (3) by the much slimmer posterior part of S3.

Figures

FIGURE 22. Gynacantha dobsoni, male, insert male: S2, ventral; anal appendages, dorsal.

FIGURES 3–11. Gynacantha species, male S2, ventral (to show arrangement of denticles along genital fossa): (3) G. rosenbergi; (4) G. dobsoni; (5) G. amphora; (6) G. vanuatua; (7) G. vitiana; (8) G. koroana; (9) G. stevensoni; (10) Gynacantha cf stevensoni; (11) G. apiaensis.

FIGURES 12–21. Gynacantha species, male anal appendages dorsal (to show differences between width of S10 and length of superior anal appendages): (12) G. rosenbergi; (13) G. dobsoni; (14) G. amphora; (15, 16) G. vanuatua; (17) G. vitiana; (18) G. koroana; (19) G. stevensoni; (20) G. cf stevensoni; (21) G. apiaensis.