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Northern Threadtail (Nososticta fraterna)

The Northern Threadtail (Nososticta fraterna) is a damselfly species of the family Disparoneurinae, which contains 12 species in Australia.

The identification key to the family Disparoneurinae consists of 23 couplets, 9 of which are pertinent to Nososticta fraterna. 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.
 DisparoneurinaeNorthern Threadtail
(Nososticta fraterna)
  • Disparoneurinae: Key couplet 2 of 23

  • ○ Wing membrane hyaline or yellow
  • b ↑
  • Disparoneurinae: Key couplet 4 of 23

  • ○ Antehumeral stripes ochraceus, with whitish, pale green or blue
  • b ↑
  • Disparoneurinae: Key couplet 6 of 23

  • ○ Abdominal tergum 5 with at most narrow basal spot or spots occupying 10% or less the length of the tergum, tergum 8 pale only along lateral margin
  • b ↑
  • Disparoneurinae: Key couplet 7 of 23

  • couplet drawing
  • ● Small ferruginous spot, or no pale mark, beside each lateral ocellus
  • b ↑
  • Disparoneurinae: Key couplet 8 of 23

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Postclypeus black, genae substantially to entirely black
    ● Antehumeral stripes ochreous to greenish blue, narrow, parallel-sided or slightly widened above, sometimes short, truncate

    ⇒ species: Northern Threadtail (Nososticta fraterna)
  • a ↑
  • Disparoneurinae: Key couplet 13 of 23

  • couplet drawing
    couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum reflexed, scoop-shaped, strongly concave above, uniformly rounded to subtriangular with rounded apex
  • a ↑
  • Disparoneurinae: Key couplet 14 of 23

  • ○ Abdominal tergum 1 dark brown or black above
  • b ↑
  • Disparoneurinae: Key couplet 16 of 23

  • couplet drawing
  • ● Posterior lobe shallowly concave, subtriangular, almost equilateral from above, edges almost straight in profile
  • b ↑
  • Disparoneurinae: Key couplet 17 of 23

  • couplet drawing
  • ● Antehumeral stripes narrow, separated from lower end of dorsal carina by at least twice their width at that level, commonly three times or more

    ⇒ species: Northern Threadtail (Nososticta fraterna)
  • a ↑
1 Male only
  • Disparoneurinae: Key couplet 2 of 23

  • ○ Central portion of the wings with brown to black markings
a ↑
b ↓
  • ○ Wing membrane hyaline or yellow

2 Male only
  • Disparoneurinae: Key couplet 4 of 23

  • ○ Antehumeral stripes bright orange
a ↑
b ↓
  • ○ Antehumeral stripes ochraceus, with whitish, pale green or blue

3 Male only
  • Disparoneurinae: Key couplet 6 of 23

  • ○ Abdominal terga 5 and 8 with substantial basal green to yellowish marks, that on segment 8 occupying approximately half the tergum

    ⇒ species: Fivespot Threadtail (Nososticta solitaria)
a ↑
b ↓
  • ○ Abdominal tergum 5 with at most narrow basal spot or spots occupying 10% or less the length of the tergum, tergum 8 pale only along lateral margin

4 Male only
  • Disparoneurinae: Key couplet 7 of 23

  • couplet drawing
  • ● Broad oval greenish to whitish spot beside each lateral ocellus
    ○ Antehumeral stripes pale green

    ⇒ species: Malachite Threadtail (Nososticta liveringa)
a ↑
b ↓
  • couplet drawing
  • ● Small ferruginous spot, or no pale mark, beside each lateral ocellus

5 Male only
  • Disparoneurinae: Key couplet 8 of 23

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Postclypeus black, genae substantially to entirely black
    ● Antehumeral stripes ochreous to greenish blue, narrow, parallel-sided or slightly widened above, sometimes short, truncate

    ⇒ species: Northern Threadtail (Nososticta fraterna)
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Postclypeus blue, or blue and black
    ● Genae substantially blue
    ● Antehumeral stripes each occupying almost half the width of mesanepisternum, or more, narrowing above

6 Female only
  • Disparoneurinae: Key couplet 13 of 23

  • couplet drawing
    couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum reflexed, scoop-shaped, strongly concave above, uniformly rounded to subtriangular with rounded apex
a ↑
b ↓
  • couplet drawingcouplet drawing
    couplet drawing
    couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum not scoop-shaped
    ● Apex, if defined, protuberant from lateral contour of lobe

7 Female only
  • Disparoneurinae: Key couplet 14 of 23

  • ○ Abdominal tergum 1 pale to dull orange
a ↑
b ↓
  • ○ Abdominal tergum 1 dark brown or black above

8 Female only
  • Disparoneurinae: Key couplet 16 of 23

  • couplet drawing
  • ● Posterior lobe of pronotum deeply concave, edges strongly bowed in profile, apex broad and rounded, appearing semicircular to truncate from above

    ⇒ species: Fivespot Threadtail (Nososticta solitaria)
a ↑
b ↓
  • couplet drawing
  • ● Posterior lobe shallowly concave, subtriangular, almost equilateral from above, edges almost straight in profile

9 Female only
  • Disparoneurinae: Key couplet 17 of 23

  • couplet drawing
  • ● Antehumeral stripes narrow, separated from lower end of dorsal carina by at least twice their width at that level, commonly three times or more

    ⇒ species: Northern Threadtail (Nososticta fraterna)
a ↑
b ↓
  • couplet drawing
  • ● Antehumeral stripes broader, separated from lower end of dorsal carina by up to twice their width at that level

    ⇒ species: Malachite Threadtail (Nososticta liveringa)

Australian distribution