Powdered Flatwing (Austroargiolestes calcaris)

Powdered Flatwing (Austroargiolestes calcaris)

Inhabits streams, deep pools and boggy seepages

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

• Megapodagrionidae: Key couplet 1 of 31

• 
• ○ Smaller, with abdomen shorter than 42 mm, hindwings shorter than 35 mm
  ● Fewer than 27 postnodals

• Megapodagrionidae: Key couplet 2 of 31

• 
• ● Generally three or more cells, rarely two in discoidal field between discoidal cell and level of subnodus
  ● Male superior anal appendages with ventral spur
  
  ⇒ genus: Austroargiolestes

• Megapodagrionidae: Key couplet 3 of 31

• 
• ● Anterior frons, clypeus and labrum dark greenish brown to black

• Megapodagrionidae: Key couplet 6 of 31

• 
  
• ● Median part to much of front of synthorax dark brown to black with pale to yellowish brown humeral stripe on each side, sometimes pruinescent

• Megapodagrionidae: Key couplet 7 of 31

• 
• ● Humeral stripe not widened at upper end

• Megapodagrionidae: Key couplet 9 of 31

• 
• ● Superior anal appendages with tip of ventral spur visible from above

• Megapodagrionidae: Key couplet 9 of 31

• 
• ● Superior anal appendages with ventral spur not visible from above

• Megapodagrionidae: Key couplet 10 of 31

• 
• ● Distal end of inner marginal ridge of superior appendages ending in sharp point above ventral spur
  
  ⇒ species: Powdered Flatwing (Austroargiolestes calcaris) (some)

• Megapodagrionidae: Key couplet 12 of 31

• 
• ● Distal end of inner marginal ridge of superior appendages ending in sharp point above ventral spur
  
  ⇒ species: Powdered Flatwing (Austroargiolestes calcaris) (some)

• Megapodagrionidae: Key couplet 14 of 31

• 
  
• ● Median part to much of front of synthorax dark brown to black, with pale to red-brown humeral stripe on each side, sometimes pruinescent

• Megapodagrionidae: Key couplet 15 of 31

• 
• ● Pale stripe in front of mesopleural suture constricted near upper end, then broadened at tip, not obscured by pruinescence

• Megapodagrionidae: Key couplet 17 of 31

• 
• ● Outer face of mandible largely pale

• Megapodagrionidae: Key couplet 18 of 31

• 
  
• ● Uppermost point of mesanepisternal part of humeral stripe at mesopleural suture, the upper part of stripe thus appearing acutely tapered
  ● Sometimes obscured by pruinescence

• Megapodagrionidae: Key couplet 20 of 31

• ○ Ratio between length of hindwing and length of metafemur approximately 4.3 (range 4.0-4.6)
  ○ Mature adults with front of synthorax strongly pruinescent

• Megapodagrionidae: Key couplet 21 of 31

• ○ Pterostigma of mature adults brown to black
  ○ South-eastern New South Wales (south of Hunter River), Victoria
  
  ⇒ species: Powdered Flatwing (Austroargiolestes calcaris)