DragonflyPix

Pinchtail (Odontogomphus donnellyi)

The Pinchtail (Odontogomphus donnellyi) 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 Odontogomphus donnellyi. 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.
 GomphidaePinchtail
(Odontogomphus donnellyi)
  • 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
    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
  • b ↑
  • Gomphidae: Key couplet 18 of 47

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Two or three crossveins between sectors of arculus proximal to fork of Rs in hindwing
    ● Superior appendages with slender ventral spine at extreme base

    ⇒ species: Pinchtail (Odontogomphus donnellyi)
  • b ↑
  • Gomphidae: Key couplet 19 of 47

  • couplet drawing
  • ● Anterior part of abdominal segments 3 and 4, in front of supplementary transverse carina, with broad, mid-dorsal black patch or band
  • a ↑
  • Gomphidae: Key couplet 20 of 47

  • couplet drawing
  • ● Ovipositor about as long as sternum 9

    ⇒ species: Pinchtail (Odontogomphus donnellyi)
  • 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 18 of 47

  • couplet drawing
    couplet drawingcouplet drawing
  • ● One crossvein between sectors of arculus proximal to fork of Rs in hindwing
    ● Superior appendages with lateroventral spine near base
    ○ From south-western Australia

    ⇒ species: Armourtail (Armagomphus armiger)
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Two or three crossveins between sectors of arculus proximal to fork of Rs in hindwing
    ● Superior appendages with slender ventral spine at extreme base

    ⇒ species: Pinchtail (Odontogomphus donnellyi)

5 Female only
  • Gomphidae: Key couplet 19 of 47

  • couplet drawing
  • ● Anterior part of abdominal segments 3 and 4, in front of supplementary transverse carina, with broad, mid-dorsal black patch or band
a ↑
b ↓
  • couplet drawing
    couplet drawing
    couplet drawing
  • ● Anterior of abdominal segments 3 and 4 with mid-dorsal yellow band, sometimes narrow, or entirely yellow

6 Female only
  • Gomphidae: Key couplet 20 of 47

  • couplet drawing
  • ● Ovipositor about as long as sternum 9

    ⇒ species: Pinchtail (Odontogomphus donnellyi)
a ↑
b ↓
  • couplet drawing
  • ● Ovipositor less than half length of sternum 9

Australian distribution