Gynacantha rosenbergi Kaup in Brauer 1867
Creators: name: Theischinger, Gunther
name: Marinov, Milen
name: Bybee, Seth
name: Jensen, Colin
name: Theuerkauf, Jörn
name: Rashni, Bindiya
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Odonata
Aeshnidae
Gynacantha
Gynacantha rosenbergi

description: Key to the species of the Gynacantha rosenbergi group (males only)
1 Minimum width at the constriction (waist) of S3 slightly less than, to slightly greater than, maximum width of S10, ratio 0.85–1.15 (Fig. 36 a–d); superior anal appendages long compared with the width of S10, ratio 3.74–4.10, inferior appendage basally not wider than ½ width of S10 (Fig. 36b, d).................................... G. rosenbergi group s. str 2
- Minimum width at the constriction (waist) of S3 markedly less than maximum width of S10, ratio 0.59–0.72 (Fig. 36e, f); superior anal appendages shorter compared to the width of S10, ratio 3.07–3.55, inferior appendage basally wider than ½ width of S10 (Fig. 36f)............................................................... G. rosenbergi Pacific group 4
2(1) 3 rows of cells between anal triangle and anal loop (Fig. 36 g); posterior section of S3 extremely expanded (Fig. 36h)................................................................................................ G. amphora
- Only 2 rows of cells between anal triangle and anal loop (Fig. 36 i); posterior section of S3 extremely expanded (Fig. 36j).. ................................................................................................... 3
3(2) Denticles (3–10) along genital fossa restricted to posterior region (Fig. 36a); apex of slightly double-curved superior anal appendages curving into short, not very acute point (Fig. 36b).......................................... G. rosenbergi
- Denticles (8–30) along genital fossa often extending beyond posterior region (Fig. 36c); apex of almost straight superior anal appendages curving into acute point (Fig. 36d)...................................................... G. dobsoni
4(1) No dark T-mark on postfrons (Fig. 36k); apex of inwardly sinuous superior anal appendages not pointed (Fig. 36f).................................................................................................. G. apiaensis
- A dark T-mark on postfrons (Fig. 36l); apex of straight or in-curved (converging) superior anal appendages variably pointed (Fig. 36 q–t).......................................................................................... 5
5(4) Denticles (10–12) along genital fossa restricted to posterior region (Fig. 36 m) and rather densely set in a subtriangular arrangement; apex of straight superior anal appendages widely curved into a moderately long point; inferior appendage at least 1/3 length of superiors (Fig. 36q)................................................................... G. vanuatua
- Denticles along genital fossa not completely restricted to posterior region (Fig. 36 n–p); apex of superior anal appendages more narrowly curved into a short point, inferior appendage less than 1/3 length of superiors (Fig. 36 r–t).................... 6
6(5) 4–5 denticles along posterior portion of genital fossa much larger than the others and thus appearing densely set (Fig. 36o); superior anal appendages subapically approximately twice as wide as at base (Fig. 36s)...................... G. koroana
- Not more than 2–3 denticles along posterior portion of genital fossa markedly larger than the others (Fig. 36n, p); superior anal appendages subapically approximately 1½ times as wide as at base (Fig. 36r, t).................................... 7
7(6) Superior anal appendages almost straight (Fig. 36r)................................................... G. vitiana
- Superior anal appendages widely in-curved (converging) (Fig. 36t).................................... G. stevensoni
description: Published as part of 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), pp. 171-195 in Zootaxa 4778 (1) on page 194, DOI: 10.11646/zootaxa.4778.1.7, http://zenodo.org/record/3823698