Lesser Duskhawker (Gynacantha dobsoni)

Lesser Duskhawker (Gynacantha dobsoni)

Inhabits pools, ponds and swamps

© 2011 DECCW, NSW and DragonflyPix.com

• 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

• 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

• Aeshnidae: Key couplet 6 of 12

• 
• ● Anal triangle of male broad or narrow, with three or more cells
  ● Dentigerous plate of female two-pronged

• 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

• 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

• 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

• 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
  
  ⇒ species: Lesser Duskhawker (Gynacantha dobsoni)