Gynacantha, Rambur, 1842

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 : 187-188

Gynacantha sp. cf. stevensoni

( Figs 10 , 20 , 32 , 34g , 36l, 36p, 36t )

Apart from the holotype of G. stevensoni there is only one specimen from Tonga available .

1 ♂: Accession number NZAC04147005; Kingdom of Tonga, Tongatapu Island, Nuku’alofa , at light 28 October 1974, P. Maddison leg.; studied .

This may be the same as G. stevensoni even though there are several double cells in both Hw in the proximal half of the space between CuP and A1, the superior anal appendages appear somewhat longer and the apical portion

of the inferior appendage appears somewhat narrower. This however may partly be due to the anal appendages of the holotype of G. stevensoni having been photographed at a distinct angle.

Figures

FIGURE 32. Gynacantha sp. cf stevensoni, male, habitus; insert: S2, ventral; anal appendages, dorsal.

FIGURE 34. Gynacantha sp. with superior anal appendages sharply pointed: (a) G. dobsoni from Australia; (b) G. dobsoni from New Caledonia, Lifou; (c, d) G. vanuatua; (e) G. vitiana; (f) G. koroana; (g) G. sp. cf stevensoni.

FIGURE 36. Key structures of males of Gynacantha species. (a, c, e) S2 and S3, ventral, (b, d, f) anal appendages, dorsal: (a, b) G. rosenbergi; (c, d) G. dobsoni; (e, f) G. apiaensis; (g, i) part of hindwing, (h, j) S2 and S3, dorsal: (g, h) G. amphora; (i, j) G. dobsoni; (k, l) head: (k) G. apiaensis; (l) G. cf. stevensoni; (m–p) genital fossa, (q–t) anal appendages: (m, q) G. vanuatua; (n, r) G. vitiana; (o, s) G. koroana; (p, t) G. sp. cf. stevensoni.

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.