Swamp Flat-tail (Austrothemis nigrescens)

Swamp Flat-tail (Austrothemis nigrescens)

Inhabits lakes, permanent ponds and swamps

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

• Libellulidae: Key couplet 1 of 67

• 
• ● Distal antenodal of forewing complete, both costal and subcostal sections present

• Libellulidae: Key couplet 1 of 67

• 
• ● Distal antenodal of forewing incomplete, only the costal section present

• Libellulidae: Key couplet 2 of 67

• 
• ● Anal loop present

• Libellulidae: Key couplet 9 of 67

• 
• ● Anal loop well developed, generally stocking-shaped, usually closed at tip

• Libellulidae: Key couplet 14 of 67

• ○ Not as above

• Libellulidae: Key couplet 15 of 67

• 
• ● Base of hindwing triangle at or proximal to arculus
  ○ Top of frons, if metallic, dully so

• Libellulidae: Key couplet 20 of 67

• ○ Smaller dragonflies, hindwing up to 40 mm long
  ○ Wings patterned or hyaline

• Libellulidae: Key couplet 21 of 67

• 
• ● Subtriangle of forewing with three or more cells

• Libellulidae: Key couplet 24 of 67

• 
• ● Forewing triangle crossed

• Libellulidae: Key couplet 27 of 67

• 
• ● Small tongue-like evagination from central hind margin of eye
  
  ⇒ species: Swamp Flat-Tail (Austrothemis nigrescens) (part)

• Libellulidae: Key couplet 35 of 67

• 
• ● Hindwing triangle free

• Libellulidae: Key couplet 39 of 67

• ○ Not as above

• Libellulidae: Key couplet 40 of 67

• 
• ● Base of hindwing triangle at or slightly proximal to arculus

• Libellulidae: Key couplet 41 of 67

• 
• ● Tip of anal loop closed, the bounding veins meeting midvein one row of cells away from wing margin

• Libellulidae: Key couplet 45 of 67

• 
• ● Subtriangle of forewing with one to three cells, its basal side well-defined

• Libellulidae: Key couplet 46 of 67

• ○ Smaller dragonflies, hindwing shorter than 38 mm

• Libellulidae: Key couplet 47 of 67

• 
• ● Discoidal field of forewing, between triangle and level of origin of IR3, starting with two or three rows of cells, followed by two rows

• Libellulidae: Key couplet 49 of 67

• ○ Hindwing shorter than 30 mm

• Libellulidae: Key couplet 51 of 67

• 
• ● Small tongue-like evagination from central hind margin of eye
  
  ⇒ species: Swamp Flat-Tail (Austrothemis nigrescens) (part)