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Iota Ringtail (Austrolestes io)

The Iota Ringtail (Austrolestes io) 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, 7 of which are pertinent to Austrolestes io. 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.
 LestidaeIota Ringtail
(Austrolestes io)
  • 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 extending across mesopleural suture
  • a ↑
  • Lestidae: Key couplet 9 of 15

  • couplet drawing
  • ○ Abdominal segment 10 of male pale above
    ● Dorsal dark mark on abdominal tergum 2 of female broad, divided by narrow, pale mid-dorsal line, pale lateral areas scarcely visible from above
  • b ↑
  • Lestidae: Key couplet 10 of 15

  • couplet drawingcouplet drawing
  • ● Median lobe of pronotum with pale lateral margin
    ● Abdominal tergum 2 of male dark above, with pale, narrow mid-dorsal line over distal third

    ⇒ species: Iota Ringtail (Austrolestes io)
  • 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 9 of 15

  • couplet drawing
  • ○ Abdominal segment 10 of male black
    ● Dorsal dark band on abdominal tergum 2 of female relatively narrow, the pale lateral areas clearly visible from above

    ⇒ species: Dune Ringtail (Austrolestes minjerriba) (part)
a ↑
b ↓
  • couplet drawing
  • ○ Abdominal segment 10 of male pale above
    ● Dorsal dark mark on abdominal tergum 2 of female broad, divided by narrow, pale mid-dorsal line, pale lateral areas scarcely visible from above

7  
  • Lestidae: Key couplet 10 of 15

  • couplet drawingcouplet drawing
  • ● Median lobe of pronotum with pale lateral margin
    ● Abdominal tergum 2 of male dark above, with pale, narrow mid-dorsal line over distal third

    ⇒ species: Iota Ringtail (Austrolestes io)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Median lobe of pronotum dark laterally
    ● Abdominal tergum 2 of male dark above with broad, pale mid-dorsal stripe

    ⇒ species: Wandering Ringtail (Austrolestes leda) (part)

Australian distribution