Gynacantha rosenbergi Kaup in Brauer, 1867

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 : 174-175

Gynacantha rosenbergi Kaup in Brauer, 1867

( Figs 1 , 3 , 12 , 28, 33a, 36a, 36b)

Gynacantha rosenbergi Kaup in Brauer, 1867: 295 .

Lectotype ♂: Neuguinea ( NHMV); detail photos studied.

Material studied. New Guinea. Awala Estate , Popondetta subdistrict Papua: 1 ♀, 26 October 1963, D.K. McAlpine leg. ( AM) ; Aroana Estate , Aroa River, Papua, 5 December 1963, D.K. McAlpine leg. ( AM) ; North NG, Bivak Boswezen aan dode arm, Tanirivier (2°41’S / 140°51’E): 1 ♀, 21 November 1954, L.B. Holthuis & L.D. Brongersma leg. ( RMNH) ; D’Entrecasteaux , Fergusson I.: 1 ♂, 30 May 1956, L.J. Brass leg. ( RMNH) ; Misool I., N, Fakal , 0–75 m: 1 ♀, 5 November 1948, M.A. Lieftinck leg. ( RMNH) ; Southeast NG, Kokoda Trail, 600 m: 1 ♀, no date, 1 ♀, 23 January, both R. Straatman leg. ( RMNH) ; Southeast NG, Sogeri , 500 m: 1 ♂, 30 October 1969, 1 ♂, 3 November 1969, 1 ♀, 4 November 1969, all R. Straatman leg. ( RMNH) ; Northwest NG, Sorong : 1 ♂, 18 Au- gust 1948, M.A. Lieftinck leg. ( RMNH) ; Woodlark I., Kulumadau : 1 ♂, 3 October 1956, L.J. Brass leg. ( RMNH) ; New Britain , Gazelle Peninsula, Warangoi: 1 ♀, 25 May 1956, BISH ( RMNH) ; Loz Negroz I.: 1 ♂, 16 September 1944 ( RMNH) . North Queensland. nr Bloomfield: 1 ♂, 31 March 1997, G. Theischinger & L. Mueller leg. ( AM) ; Cairns : 1 ♀, 12 June E. Allen leg. ( AM) ; Cooktown : 1 ♀, 1 September, R.J. Tillyard leg. ( AM) ; Daintree , Cape Tribulation: 1 ♀, 16–25 January 1992, G. Theischinger leg. ( AM) ; Eet Hill vicinity, Moa (Banks) Island, Torres Strait: 1 ♂, 9–13 July, G.B. Monteith & D. Cook leg. ( AM) ; Gordon Creek , Iron Range: 1 ♂, 22 April 1975, 1 ♂, 26 April 1975, M.S. Moulds leg. ( AM) ; Innisfail : 1 ♀, A. MacArthur leg. ( AM) ; Julatten : 1 ♀, January 1968 ( AM) ; King Fisher Lodge , nr Mt Lewis: 1 ♂, February 2005, 1 ♀, 18 February 2005, both G. Theischinger leg. ( AM) ; Kowanyama : 1 ♀, 10 January 1977, D.L. Hancock leg. ( AM) ; Rocky River , McIlwraith Range: 1 ♀, 6–8 November 1969, B. Cantrell leg. ( AM) ; Station Creek , N of Mareeba: 1 ♂, 29 October 2004, 1 ♀, 8 November 2004, both L. Mueller leg. ( AM) .

Distribution. Indonesia ( Moluccas, Aru Islands), Papua New Guinea, north-east of Australia.

Diagnostic characters: Postfrons with dark T-mark. Both Hw generally with space between CuP and A1 basally not expanded and without double cells in proximal half. Generally no more than 10 denticles along posterior portion of genital fossa not strictly formatted or densely set, somewhat irregular, generally no denticles along anterior portion. Superior anal appendages very slender, slightly sinuous, clubbed with subapical portion not wider than 1.5 times basal width and with apex narrowly curved postero-laterally into a short, not particularly acute point; inferior appendage slightly less than 1/3 the length of superiors, with lateral edges of basal portion convex and rather abruptly narrowing into a very slightly tapered and rather long apical portion.

Distinguished from G. dobsoni , with which it overlaps in range in Australia, by (1) fewer denticles (3–10) along genital fossa that are generally restricted to the posterior part, (2) more distinctly sinuous and less sharply pointed superior anal appendages and (3) by the longer, more slightly tapered apical portion of the longer inferior appendage.

Distinguished from G. amphora by (1) only 2, very rarely 3, 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 1. Gynacantha rosenbergi, male, Lectotype; insert male: S2, ventral; S2–3, 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.