DragonflyPix

Black Vicetail (Hemigomphus atratus)

The Black Vicetail (Hemigomphus atratus) is a dragonfly species of the family Gomphidae, which contains 35 species in Australia.

The identification key to the family Gomphidae consists of 47 couplets, 6 of which are pertinent to Hemigomphus atratus. Click on the numbers on the right to display the corresponding couplets. Or click on the ALLin1 button to see all the relevant couplets together in a single, scrollable window.

#FamilySpeciesCouplet No.
 GomphidaeBlack Vicetail
(Hemigomphus atratus)
  • Gomphidae: Key couplet 1 of 47

  • couplet drawingcouplet drawing
  • ● 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
  • b ↑
  • Gomphidae: Key couplet 10 of 47

  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Superior anal appendages converging at tips, bearing basal, ventral to lateral spine or toothed spur
  • b ↑
  • Gomphidae: Key couplet 11 of 47

  • couplet drawingcouplet drawing
  • ● Upper projection of bipartite sternum 11 concealed by basal, toothed spine of superior anal appendage
    ○ From eastern and northern Australia

    ⇒ genus: Hemigomphus
  • a ↑
  • Gomphidae: Key couplet 12 of 47

  • couplet drawingcouplet drawing
  • ● Abdominal sternites 7 and/or 8 each with pair of strong, central setal tufts protruding below ventral carina
  • b ↑
  • Gomphidae: Key couplet 13 of 47

  • couplet drawingcouplet drawing
  • ● Tip of superior appendage smoothly curved inwards
    ● Setal tufts on sternite 7 and 8
  • a ↑
  • Gomphidae: Key couplet 14 of 47

  • couplet drawing
  • ● Abdominal terga 4-7 with basal pair of small, lateral yellow spots, broadly separated in midline

    ⇒ species: Black Vicetail (Hemigomphus atratus)
  • a ↑
1  
  • Gomphidae: Key couplet 1 of 47

  • couplet drawingcouplet drawing
  • ● Incomplete (subcostal) antenodal crossvein proximal to Ax1 usually present in forewings, sometimes lacking in hindwings
    ● End of abdomen elongate, mid-dorsal length of abdominal tergum 9 more than 2.4 mm in male, 2.3 mm in female

    ⇒ genus: Antipodogomphus
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● 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

2 Male only
  • Gomphidae: Key couplet 10 of 47

  • couplet drawingcouplet drawing
  • ● Superior anal appendages parallel or divergent, not converging at tips, each bearing a long, curved ventrobasal branch
a ↑
b ↓
  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Superior anal appendages converging at tips, bearing basal, ventral to lateral spine or toothed spur

3 Male only
  • Gomphidae: Key couplet 11 of 47

  • couplet drawingcouplet drawing
  • ● Upper projection of bipartite sternum 11 concealed by basal, toothed spine of superior anal appendage
    ○ From eastern and northern Australia

    ⇒ genus: Hemigomphus
a ↑
b ↓
  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Upper projection of bipartite sternum 11 lying outside base of superior anal appendage, its upper end turned to rear and toothed or sculptured

4 Male only
  • Gomphidae: Key couplet 12 of 47

  • couplet drawing
  • ● Abdominal sternites 7 and 8 lacking strong, central tufts of setae

    ⇒ species: Kakadu Vicetail (Hemigomphus magela)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Abdominal sternites 7 and/or 8 each with pair of strong, central setal tufts protruding below ventral carina

5 Male only
  • Gomphidae: Key couplet 13 of 47

  • couplet drawingcouplet drawing
  • ● Tip of superior appendage smoothly curved inwards
    ● Setal tufts on sternite 7 and 8
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Tip of superior appendage abruptly folded inward
    ● Setal tufts present or absent on sternite 7

6 Male only
  • Gomphidae: Key couplet 14 of 47

  • couplet drawing
  • ● Abdominal terga 4-7 with basal pair of small, lateral yellow spots, broadly separated in midline

    ⇒ species: Black Vicetail (Hemigomphus atratus)
a ↑
b ↓
  • couplet drawing
  • ● Abdominal terga 4-7 with basal yellow ring, or basal pair of large yellow spots, narrowly separated in midline

Australian distribution