Stout Vicetail (Hemigomphus heteroclytus)

Stout Vicetail (Hemigomphus heteroclytus)

Inhabits streams and rivers, which during summer are often reduced to trickles between the pools

© 2011 DECCW, NSW 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 converging at tips, bearing basal, ventral to lateral spine or toothed spur

• Gomphidae: Key couplet 11 of 47

• 
• ● Upper projection of bipartite sternum 11 concealed by basal, toothed spine of superior anal appendage
  ○ From eastern and northern Australia
  
  ⇒ genus: Hemigomphus

• Gomphidae: Key couplet 12 of 47

• 
• ● Abdominal sternites 7 and/or 8 each with pair of strong, central setal tufts protruding below ventral carina

• Gomphidae: Key couplet 13 of 47

• 
• ● Tip of superior appendage smoothly curved inwards
  ● Setal tufts on sternite 7 and 8

• Gomphidae: Key couplet 14 of 47

• 
• ● Abdominal terga 4-7 with basal yellow ring, or basal pair of large yellow spots, narrowly separated in midline

• Gomphidae: Key couplet 15 of 47

• 
• ● Superior appendages widely separated at base, maximum separation more than 1.05 mm
  ● Inner margin of superior appendage convex beyond basal divergence, curving smoothly into distal convergence
  
  ⇒ species: Stout Vicetail (Hemigomphus heteroclytus)

• Gomphidae: Key couplet 19 of 47

• 
• ● Anterior part of abdominal segments 3 and 4, in front of supplementary transverse carina, with broad, mid-dorsal black patch or band

• Gomphidae: Key couplet 20 of 47

• 
• ● Ovipositor less than half length of sternum 9

• Gomphidae: Key couplet 21 of 47

• 
• ● Two or three (occasionally one) crossveins between sectors of arculus proximal to fork of Rs in hindwing
  ○ From eastern and northern Australia
  
  ⇒ genus: Hemigomphus

• Gomphidae: Key couplet 22 of 47

• 
• ● Occiput unarmed

• Gomphidae: Key couplet 24 of 47

• 
  
• ● Central part of yellow humeral stripe present, joined or not to upper humeral spot

• Gomphidae: Key couplet 25 of 47

• 
• ● Black band along line of intersegmental suture continuous below metastigma, lacking or almost so above it

• Gomphidae: Key couplet 26 of 47

• 
• ● Postgena not swollen on either side of occiput
  ● Antehumeral stripe commonly fused below with outer corner of collar
  
  ⇒ species: Stout Vicetail (Hemigomphus heteroclytus)