Austrogomphus cornutus

Unicorn Hunter (Austrogomphus cornutus)

Inhabits streams and rivers

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

• Gomphidae: Key couplet 1 of 47

• 
• ● Generally no incomplete antenodal crossvein proximal to Ax1 in any wing
  ● End of abdomen not elongate, mid-dorsal length of abdominal tergum 9 less than 2.3 mm in male, 2.1 mm in female

• Gomphidae: Key couplet 10 of 47

• 
• ● Superior anal appendages parallel or divergent, not converging at tips, each bearing a long, curved ventrobasal branch

• Gomphidae: Key couplet 19 of 47

• 
  
  
• ● Anterior of abdominal segments 3 and 4 with mid-dorsal yellow band, sometimes narrow, or entirely yellow

• Gomphidae: Key couplet 27 of 47

• ○ Abdominal terga 9-10 usually marked with black or chocolate brown
  ○ If yellow or reddish, then tergum 8 substantially black

• Gomphidae: Key couplet 32 of 47

• 
  
  
• ● Metanepisternum substantially pale
  ● Pterostigma yellow, brown or black, its length more than 3.3 times its maximum width

• Gomphidae: Key couplet 33 of 47

• 
• ● Black and yellow or greenish-yellow, lacking lilac colouration
  ● Metepimeron posteriorly not margined with brown

• Gomphidae: Key couplet 35 of 47

• 
• ● Antehumeral stripe aslant, isolated or its lower end fused with collar
  ● Black mark on lower mesepimeron extending to level of, or engulfing, metastigma
  ● If not, metapleural suture lined with black
  
  ⇒ genus: Austrogomphus

• Gomphidae: Key couplet 39 of 47

• ○ Abdominal segment 10 black above

• Gomphidae: Key couplet 40 of 47

• 
• ● Male superior appendage tapering evenly to sharp tip
  ● Rear of female occiput with flattened tooth on each side, behind inner margin of eye, its hind border irregularly serrated

• Gomphidae: Key couplet 41 of 47

• 
  
• ● Antehumeral stripe broadly fused with collar
  ● Male occiput yellow, with darker edges, greatly swollen, forming blunt triangular horn
  ● Occipital margin of female swollen in centre
  
  ⇒ species: Unicorn Hunter (Austrogomphus cornutus)