Trifid Duskhawker (Agyrtacantha dirupta)

The Trifid Duskhawker (Agyrtacantha dirupta) is a dragonfly species of the family Aeshnidae, which contains 13 species in Australia.

The identification key to the family Aeshnidae consists of 12 couplets, 3 of which are pertinent to Agyrtacantha dirupta. Click on the numbers on the right to display the corresponding couplets. Or click on the ALLin1 button to see all the relevant couplets together in a single, scrollable window.

#	Family	Species	Couplet No.
	Aeshnidae	Trifid Duskhawker (Agyrtacantha dirupta)	Aeshnidae: Key couplet 1 of 12 ● 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 narrow, two-celled ● Dentigerous plate of female three-pronged ⇒ species: Trifid Duskhawker (Agyrtacantha dirupta) a ↑
1			Aeshnidae: Key couplet 1 of 12 ● Last prominent fork of IR3 at or near level of distal end of pterostigma in both wings ● Margin of hindwing rounded in both sexes, male lacking anal triangle and auricles ⇒ genus: Anax a ↑ b ↓ ● 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
2			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 ↑ b ↓ ● Space between CuP and 1A of hindwing two to three cells wide proximally, narrowing to half or less in width over central third
3			Aeshnidae: Key couplet 6 of 12 ● Anal triangle of male narrow, two-celled ● Dentigerous plate of female three-pronged ⇒ species: Trifid Duskhawker (Agyrtacantha dirupta) a ↑ b ↓ ● Anal triangle of male broad or narrow, with three or more cells ● Dentigerous plate of female two-pronged