DragonflyPix

Tropical Cascade Darner (Spinaeschna watsoni)

The Tropical Cascade Darner (Spinaeschna watsoni) is a dragonfly species of the family Telephlebiidae and Brachytronidae, which contains 37 species in Australia.

The identification key to the family Telephlebiidae and Brachytronidae consists of 37 couplets, 6 of which are pertinent to Spinaeschna watsoni. 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.
 Telephlebiidae and BrachytronidaeTropical Cascade Darner
(Spinaeschna watsoni)
  • Telephlebiidae: Key couplet 1 of 37

  • couplet drawing
  • ● No crossveins in median space
  • b ↑
  • Telephlebiidae: Key couplet 9 of 37

  • couplet drawing
  • ○ Wings hyaline
    ● Two to four, occasionally five, cells in triangles and hypertriangles
  • b ↑
  • Telephlebiidae: Key couplet 11 of 37

  • couplet drawingcouplet drawing
  • ● Both wings with a single supplementary radial vein (Rspl)
    ● Posterior angle of hindwing triangle and 1A joined by a short crossvein
  • b ↑
  • Telephlebiidae: Key couplet 12 of 37

  • couplet drawingcouplet drawing
  • ● Male with five distinct longitudinal dorsal ridges on segment 10
    ○ Anal appendages of female at least twice as long as segment 10 (sometimes broken, thus appearing short)
    ● Supra-anal plate ending in long prominent spine
  • b ↑
  • Telephlebiidae: Key couplet 35 of 37

  • couplet drawingcouplet drawing
  • ● Top of frons dark brown to black, with a pale oval spot on each side
    ● Pale abdominal pattern largely consisting of almond-shaped spots, widely separated along midline

    ⇒ genus: Spinaeschna
  • b ↑
  • Telephlebiidae: Key couplet 37 of 37

  • couplet drawingcouplet drawing
  • ● Abdominal segment 10 of male and segment 9 of female entirely dark brown or blackish brown above
    ● Superior anal appendages of male slightly angulated near base

    ⇒ species: Tropical Cascade Darner (Spinaeschna watsoni)
  • a ↑
1  
  • Telephlebiidae: Key couplet 1 of 37

  • couplet drawing
  • ● Crossveins present in median space
a ↑
b ↓
  • couplet drawing
  • ● No crossveins in median space

2  
  • Telephlebiidae: Key couplet 9 of 37

  • couplet drawing
  • ○ Wings with dark band just behind anterior margin
    ● Six to twelve cells in triangles and hypertriangles

    ⇒ genus: Austrophlebia
a ↑
b ↓
  • couplet drawing
  • ○ Wings hyaline
    ● Two to four, occasionally five, cells in triangles and hypertriangles

3  
  • Telephlebiidae: Key couplet 11 of 37

  • couplet drawingcouplet drawing
  • ● Both wings with two supplementary radial veins (Rspl1 and Rspl2)
    ● Posterior angle of hindwing triangle meeting 1A

    ⇒ species: Thylacine Darner (Acanthaeschna victoria)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Both wings with a single supplementary radial vein (Rspl)
    ● Posterior angle of hindwing triangle and 1A joined by a short crossvein

4  
  • Telephlebiidae: Key couplet 12 of 37

  • couplet drawingcouplet drawing
  • ● Male with three or fewer, or without, distinct longitudinal dorsal ridges on segment 10
    ○ Anal appendages of female shorter than to slightly longer than segment 10
    ● Supra-anal plate rounded to subtriangular

    ⇒ genus: Austroaeschna and Dromaeschna
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Male with five distinct longitudinal dorsal ridges on segment 10
    ○ Anal appendages of female at least twice as long as segment 10 (sometimes broken, thus appearing short)
    ● Supra-anal plate ending in long prominent spine

5  
  • Telephlebiidae: Key couplet 35 of 37

  • couplet drawingcouplet drawing
  • ● Top of frons dark brown to black, with pale band running just in front of antenna and eye margin on each side
    ● Pale abdominal pattern largely consisting of elongate triangular spots along thin, dark midline

    ⇒ genus: Notoaeschna
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Top of frons dark brown to black, with a pale oval spot on each side
    ● Pale abdominal pattern largely consisting of almond-shaped spots, widely separated along midline

    ⇒ genus: Spinaeschna

6  
  • Telephlebiidae: Key couplet 37 of 37

  • couplet drawingcouplet drawing
  • ● Abdominal segment 10 of male and segment 9 of female entirely dark brown or blackish brown above
    ● Superior anal appendages of male slightly angulated near base

    ⇒ species: Tropical Cascade Darner (Spinaeschna watsoni)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Abdominal segments 9, 10 of male and segment 9 of female with a pair of pale, posterodorsal patches
    ● Superior anal appendages with ventral tooth near base

    ⇒ species: Southern Cascade Darner (Spinaeschna tripunctata)

Australian distribution