DragonflyPix

Blue Slim (Aciagrion fragile)

The Blue Slim (Aciagrion fragile) is a damselfly species of the family Coenagrionidae, which contains 30 species in Australia.

The identification key to the family Coenagrionidae consists of 54 couplets, 4 of which are pertinent to Aciagrion fragile. 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.

#FamilySpeciesCouplet No.
 CoenagrionidaeBlue Slim
(Aciagrion fragile)
  • Coenagrionidae: Key couplet 1 of 54

  • ○ Damselflies without this combination of characters
  • b ↑
  • Coenagrionidae: Key couplet 14 of 54

  • couplet drawing
  • ● Anal vein leaving wing margin nearer to or beyond level of Ac
    ● Basal segment of hindwing anal vein, if present, not more than half length of Ac
  • b ↑
  • Coenagrionidae: Key couplet 35 of 54

  • ○ Damselflies with dark brown or black markings on pale background (reddish, yellow, green, blue, pale brown), or substantially dark, the dark areas in either case often with metallic sheen
  • b ↑
  • Coenagrionidae: Key couplet 37 of 54

  • couplet drawingcouplet drawing
  • ● Pterostigma of forewing markedly larger than that of hindwing
    ● Female with ventral spine on apex of abdominal segment 8

    ⇒ species: Blue Slim (Aciagrion fragile)
  • a ↑
1  
  • Coenagrionidae: Key couplet 1 of 54

  • couplet drawing
  • ● Arculus in hindwing situated beyond distal antenodal crossvein by at least the length of subcostal part of antenodal
    ○ Very small damselflies, hindwing shorter than 14 mm

    ⇒ genus: Agriocnemis
a ↑
b ↓
  • ○ Damselflies without this combination of characters

2  
  • Coenagrionidae: Key couplet 14 of 54

  • couplet drawing
  • ● Anal vein leaving wing margin well basal to the level of Ac in both wings, so there is a basal segment of anal vein about the same length as Ac
a ↑
b ↓
  • couplet drawing
  • ● Anal vein leaving wing margin nearer to or beyond level of Ac
    ● Basal segment of hindwing anal vein, if present, not more than half length of Ac

3  
  • Coenagrionidae: Key couplet 35 of 54

  • ○ Orange-red to yellowish green damselflies without dark thoracic markings
a ↑
b ↓
  • ○ Damselflies with dark brown or black markings on pale background (reddish, yellow, green, blue, pale brown), or substantially dark, the dark areas in either case often with metallic sheen

4  
  • Coenagrionidae: Key couplet 37 of 54

  • couplet drawingcouplet drawing
  • ● Pterostigma of forewing markedly larger than that of hindwing
    ● Female with ventral spine on apex of abdominal segment 8

    ⇒ species: Blue Slim (Aciagrion fragile)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Pterostigma of forewing similar in size to that of hindwing
    ● Female lacking ventral spine on abdominal segment 8

Australian distribution