Short-Tailed Duskdarter (Zyxomma elgneri)

Short-Tailed Duskdarter (Zyxomma elgneri)

Inhabits streams, rivers, riverine pools, ponds and swamps

© 2011 DECCW, NSW and DragonflyPix.com

• Libellulidae: Key couplet 1 of 67

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

• 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 usually open on one or both sides of midvein, the bounding veins of loop extending to wing margin, occasionally closed, the bounding veins meeting at wing margin

• Libellulidae: Key couplet 42 of 67

• 
• ● Abdomen narrowing abruptly within the length of segment 3
  ○ Wing tips variably darkened, sometimes hyaline, rest of wing membrane hyaline except for dark flecks at extreme base and, in some, a dark costal band, or with general yellowish-brown suffusion
  ○ Male abdomen dull brown to blackish brown
  
  ⇒ genus: Zyxomma

• Libellulidae: Key couplet 43 of 67

• 
• ● Abdomen segment 4 not strongly constricted at supplementary transverse carina, posterior width of segment commonly less than anterior width

• Libellulidae: Key couplet 44 of 67

• 
• ○ Abdomen not longer than hindwing
  ● Junction of abdominal segments 3 and 4 almost straight
  
  ⇒ species: Short-Tailed Duskdarter (Zyxomma elgneri)