● Prominent fork of IR3 near or proximal to level of basal end of pterostigma in both wings ● Anal margin of hindwing rounded in female, angulated in male, forming anal triangle ● Male with auricles
b ↑
Aeshnidae: Key couplet 5 of 12
● Space between CuP and 1A of hindwing slightly and continuously tapering from proximal to distal end, proximal portion usually one, occasionally two cells wide
a ↑
Aeshnidae: Key couplet 6 of 12
● Anal triangle of male broad or narrow, with three or more cells ● Dentigerous plate of female two-pronged
b ↑
Aeshnidae: Key couplet 7 of 12
● Front of synthorax dull brown or green, pale or dark, with or without an ill-defined pale patch in lower, outer corner ○ Abdominal segments 4-7 with, at most, small pale spots, often almost unpatterned
⇒ genus: Gynacantha
b ↑
Aeshnidae: Key couplet 8 of 12
● Top of frons with variably dark mid-dorsal line, commonly forming T-shaped mark with dark transverse mark on crest
b ↑
Aeshnidae: Key couplet 9 of 12
● Segment 3 less strongly constricted, width of 'waist' c. 1.3 mm or more in male, 1.8 mm or more in female
b ↑
Aeshnidae: Key couplet 11 of 12
● Width of male 'waist' on abdominal segment 3 1.3-1.8 mm ● 8-30 (commonly 15-25) black denticles around margin of genital fossa ● Ventral region of tergum 3 of female relatively narrow, hind margin from last tooth on lateral ridge to alignment of inner ridge less than 1.1 mm