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Blue Ringtail (Austrolestes annulosus)

The Blue Ringtail (Austrolestes annulosus) is a damselfly species of the family Lestidae, which contains 14 species in Australia.

The identification key to the family Lestidae consists of 15 couplets, 8 of which are pertinent to Austrolestes annulosus. 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.
 LestidaeBlue Ringtail
(Austrolestes annulosus)
  • Lestidae: Key couplet 1 of 15

  • couplet drawing
  • ● Quadrilateral cell of hindwing more than 1.15 times, usually 1.3-1.5 times longer than that of forewing
  • b ↑
  • Lestidae: Key couplet 2 of 15

  • couplet drawingcouplet drawing
    couplet drawingcouplet drawingcouplet drawing
  • ● Front of synthorax unicolorous or striped, the stripe not expanded near centre
    ● Ac generally near Ax1, basal or distal, occasionally almost midway between Ax1 and Ax2

    ⇒ genus: Austrolestes
  • b ↑
  • Lestidae: Key couplet 5 of 15

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Central part of pterostigma overlying one or more crossveins of adjoining row
    ● Ac closer to level of Ax1 than of Ax2, sometimes basal to Ax1
    ○ Abdominal tergum 2 with well-defined light and dark pattern, sometimes like that of dark A. insularis (see above), or substantially dark
  • b ↑
  • Lestidae: Key couplet 6 of 15

  • couplet drawingcouplet drawing
  • ● Pale humeral stripe narrow, with at most a small upper patch extending across mesopleural suture, not meeting subalar ridge
  • b ↑
  • Lestidae: Key couplet 8 of 15

  • couplet drawing
  • ● Humeral stripe not extending across mesopleural suture
  • b ↑
  • Lestidae: Key couplet 11 of 15

  • couplet drawing
  • ○ Abdominal tergum 2 without pale basal spot
    ● Superior appendages of male forcipate, converging at tips
  • b ↑
  • Lestidae: Key couplet 12 of 15

  • ○ Abdominal tergum 2 without pale mid-dorsal stripe
  • b ↑
  • Lestidae: Key couplet 13 of 15

  • couplet drawingcouplet drawing
  • ● Ac proximal to Ax1 in forewing
    ● Abdominal terga 3-7 of male substantially pale, with forward pointing, dark arrow-shaped mark on posterior half

    ⇒ species: Blue Ringtail (Austrolestes annulosus)
  • a ↑
1  
  • Lestidae: Key couplet 1 of 15

  • couplet drawing
  • ● Quadrilateral cells of forewing and hindwing similar in size and shape, that of hindwing less than 1.10 times length of forewing quadrilateral

    ⇒ species: Dusky Spreadwing (Lestes concinnus)
a ↑
b ↓
  • couplet drawing
  • ● Quadrilateral cell of hindwing more than 1.15 times, usually 1.3-1.5 times longer than that of forewing

2  
  • Lestidae: Key couplet 2 of 15

  • couplet drawingcouplet drawing
  • ● Front of synthorax marked with vertical, metallic green stripe on each side, expanded laterally near centre to form brownish green or green spot
    ● Ac approximately midway between Ax1 and Ax2 in forewing, often nearer to Ax2

    ⇒ genus: Indolestes
a ↑
b ↓
  • couplet drawingcouplet drawing
    couplet drawingcouplet drawingcouplet drawing
  • ● Front of synthorax unicolorous or striped, the stripe not expanded near centre
    ● Ac generally near Ax1, basal or distal, occasionally almost midway between Ax1 and Ax2

    ⇒ genus: Austrolestes

3  
  • Lestidae: Key couplet 5 of 15

  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Pterostigma overlying crossveins of adjoining row only near each end
    ● Ac far beyond level of Ax1, generally about midway between Ax1 and Ax2
    ● Abdominal tergum 2 marked with dark longitudinal stripe on each side of pale midline, or with ill-defined marks on pale background

    ⇒ species: Northern Ringtail (Austrolestes insularis)
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Central part of pterostigma overlying one or more crossveins of adjoining row
    ● Ac closer to level of Ax1 than of Ax2, sometimes basal to Ax1
    ○ Abdominal tergum 2 with well-defined light and dark pattern, sometimes like that of dark A. insularis (see above), or substantially dark

4  
  • Lestidae: Key couplet 6 of 15

  • couplet drawingcouplet drawing
  • ● Pale humeral stripe broad, its upper end crossing mesopleural suture on to mesepimeron and subalar ridge almost to segmental junction
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Pale humeral stripe narrow, with at most a small upper patch extending across mesopleural suture, not meeting subalar ridge

5  
  • Lestidae: Key couplet 8 of 15

  • couplet drawing
  • ● Humeral stripe extending across mesopleural suture
a ↑
b ↓
  • couplet drawing
  • ● Humeral stripe not extending across mesopleural suture

6  
  • Lestidae: Key couplet 11 of 15

  • couplet drawingcouplet drawing
  • ● Abdominal tergum 2 dark distally, with basal pale semicircular, triangular or pointed half-oval spot
    ● Superior appendages of male sinuate, reflexed and broadly contiguous at tips

    ⇒ species: Metallic Ringtail (Austrolestes cingulatus)
a ↑
b ↓
  • couplet drawing
  • ○ Abdominal tergum 2 without pale basal spot
    ● Superior appendages of male forcipate, converging at tips

7  
  • Lestidae: Key couplet 12 of 15

  • couplet drawingcouplet drawing
  • ● Abdominal tergum 2 with pale mid-dorsal stripe over entire length, broad in male, narrow in female

    ⇒ species: Wandering Ringtail (Austrolestes leda) (part)
a ↑
b ↓
  • ○ Abdominal tergum 2 without pale mid-dorsal stripe

8  
  • Lestidae: Key couplet 13 of 15

  • couplet drawingcouplet drawing
  • ● Ac proximal to Ax1 in forewing
    ● Abdominal terga 3-7 of male substantially pale, with forward pointing, dark arrow-shaped mark on posterior half

    ⇒ species: Blue Ringtail (Austrolestes annulosus)
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Ac distal to Ax1 in forewing
    ● Abdominal terga 3-7 of male substantially dark, with pale basal rings

Australian distribution