Austroagrion cyane

South-western Billabongfly (Austroagrion cyane)

Inhabits still and sluggish waters, riverine pools, lakes, ponds and swamps

© 2011 DECCW, NSW; 2021 Ian Endersby and DragonflyPix.com

• Coenagrionidae: Key couplet 1 of 54

• ○ Damselflies without this combination of characters

• Coenagrionidae: Key couplet 14 of 54

• 
• ● 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

• 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

• Coenagrionidae: Key couplet 37 of 54

• 
• ● Pterostigma of forewing similar in size to that of hindwing
  ● Female lacking ventral spine on abdominal segment 8

• Coenagrionidae: Key couplet 38 of 54

• 
• ● Pterostigma markedly longer than wide

• Coenagrionidae: Key couplet 40 of 54

• ○ No such markings on thorax or abdomen

• Coenagrionidae: Key couplet 41 of 54

• ○ Synthorax blue and black

• Coenagrionidae: Key couplet 42 of 54

• ○ Antealar sinus black

• Coenagrionidae: Key couplet 44 of 54

• ○ Abdominal segment 4 and 5 more than half black above
  
  ⇒ genus: Austroagrion

• Coenagrionidae: Key couplet 45 of 54

• 
• ● Abdominal segment 8 entirely blue
  ● Posterior part of segment 7 usually blue
  ● Segment 9 blue, occasionally with small, distal mid-dorsal black mark
  
  ⇒ species: South-Western Billabongfly (Austroagrion cyane)

• Coenagrionidae: Key couplet 48 of 54

• 
• ● Posterior lobe of pronotum without forwardly directed, finger-like process on each side

• Coenagrionidae: Key couplet 50 of 54

• 
• ○ Upper surface of abdominal segment 1 brown to black, with or without orange-brown dorsal and lateral marks
  ● Anal vein leaving wing margin at Ac

• Coenagrionidae: Key couplet 51 of 54

• ○ Synthoracic terga partially dark brown to black
  ○ Abdominal tergum 1 with triangular to parallel-sided dark brown to black dorsal mark lacking pale mid-dorsal line
  
  ⇒ genus: Austroagrion

• Coenagrionidae: Key couplet 52 of 54

• 
• ● Central part of posterior lobe of pronotum rounded triangular

• Coenagrionidae: Key couplet 53 of 54

• 
• ● Central part of posterior lobe of pronotum with slightly raised margin and rounded apex

• Coenagrionidae: Key couplet 54 of 54

• 
• ● Postclypeus black, with or without pale margin
  
  ⇒ species: South-Western Billabongfly (Austroagrion cyane)