Blue Riverdamsel (Pseudagrion microcephalum)

Blue Riverdamsel (Pseudagrion microcephalum)

Inhabits still and flowing waters; streams, rivers, riverine lagoons, lakes and ponds

© 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 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

• Coenagrionidae: Key couplet 15 of 54

• ○ Hindwing longer than 22 mm

• Coenagrionidae: Key couplet 16 of 54

• ○ Abdominal segments 2-4 bronze-black above
  
  ⇒ genus: Pseudagrion

• Coenagrionidae: Key couplet 18 of 54

• ○ Synthorax blue and black

• Coenagrionidae: Key couplet 19 of 54

• 
• ● Superior anal appendages with deep, V-shaped notch at tip, the lower branch longer than the upper
  
  ⇒ species: Blue Riverdamsel (Pseudagrion microcephalum)

• Coenagrionidae: Key couplet 23 of 54

• 
• ● Dark pigmentation on abdominal segments 3-5 less extensive, tapered to rounded in front, narrowing to back, abruptly expanded distally, so that lateral pale areas are clearly visible from above, and lateral margin is sinuate

• Coenagrionidae: Key couplet 26 of 54

• 
• ● Finger-like processes much longer than height of anterior lobe at point of attachment

• Coenagrionidae: Key couplet 27 of 54

• 
• ● Transverse ridge curving progressively into inner ridge
  
  ⇒ species: Blue Riverdamsel (Pseudagrion microcephalum)

• Coenagrionidae: Key couplet 40 of 54

• ○ No such markings on thorax or abdomen

• Coenagrionidae: Key couplet 41 of 54

• ○ Synthorax with extensive brown or yellow areas, sometimes pruinescent
  
  ⇒ genus: Pseudagrion

• Coenagrionidae: Key couplet 43 of 54

• 
• ● Ac of hindwing beyond alignment of basal antenodal crossvein
  
  ⇒ genus: Pseudagrion

• Coenagrionidae: Key couplet 49 of 54

• 
• ● Ac of hindwing beyond alignment with basal antenodal crossvein
  
  ⇒ genus: Pseudagrion