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Black-Winged Threadtail (Nososticta baroalba)

The Black-Winged Threadtail (Nososticta baroalba) 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, 7 of which are pertinent to Nososticta baroalba. 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.
 DisparoneurinaeBlack-Winged Threadtail
(Nososticta baroalba)
  • Disparoneurinae: Key couplet 2 of 23

  • ○ Central portion of the wings with brown to black markings
  • a ↑
  • Disparoneurinae: Key couplet 3 of 23

  • ○ Wings with broader, more diffuse brown patch, from about level of nodus almost to pterostigma

    ⇒ species: Black-Winged Threadtail (Nososticta baroalba)
  • b ↑
  • Disparoneurinae: Key couplet 13 of 23

  • couplet drawingcouplet drawing
    couplet drawing
    couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum not scoop-shaped
    ● Apex, if defined, protuberant from lateral contour of lobe
  • b ↑
  • Disparoneurinae: Key couplet 18 of 23

  • couplet drawingcouplet drawingcouplet drawing
  • ● Posterior lobe of pronotum with well-defined apex, bearing blunt to finger-like or subtriangular projection
  • a ↑
  • Disparoneurinae: Key couplet 19 of 23

  • couplet drawing
  • ● Projection of apex of posterior lobe of pronotum blunt to finger-like
  • b ↑
  • Disparoneurinae: Key couplet 20 of 23

  • couplet drawing
  • ● Black band extending across gena from anterior mandibular articulation to, or almost to, eye, sometimes contiguous with black lower margin of gena
  • b ↑
  • Disparoneurinae: Key couplet 21 of 23

  • couplet drawing
  • ● Antehumeral stripes narrow, separated from lower end of dorsal carina by approximately three times their width at that level

    ⇒ species: Black-Winged Threadtail (Nososticta baroalba)
  • 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 3 of 23

  • ○ Wings with well-defined brownish-black transverse band between levels of about 3rd-4th and 7th-9th postnodal veins

    ⇒ species: Spot-Winged Threadtail (Nososticta kalumburu)
a ↑
b ↓
  • ○ Wings with broader, more diffuse brown patch, from about level of nodus almost to pterostigma

    ⇒ species: Black-Winged Threadtail (Nososticta baroalba)

3 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

4 Female only
  • Disparoneurinae: Key couplet 18 of 23

  • couplet drawingcouplet drawingcouplet drawing
  • ● Posterior lobe of pronotum with well-defined apex, bearing blunt to finger-like or subtriangular projection
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum without well-defined apex

5 Female only
  • Disparoneurinae: Key couplet 19 of 23

  • couplet drawing
  • ● Projection of apex of posterior lobe of pronotum subtriangular

    ⇒ species: Striped Threadtail (Nososticta mouldsi)
a ↑
b ↓
  • couplet drawing
  • ● Projection of apex of posterior lobe of pronotum blunt to finger-like

6 Female only
  • Disparoneurinae: Key couplet 20 of 23

  • couplet drawing
  • ● Gena pale at anterior (upper) mandibular articulation

    ⇒ species: Melville Island Threadtail (Nososticta taracumbi)
a ↑
b ↓
  • couplet drawing
  • ● Black band extending across gena from anterior mandibular articulation to, or almost to, eye, sometimes contiguous with black lower margin of gena

7 Female only
  • Disparoneurinae: Key couplet 21 of 23

  • couplet drawing
  • ● Antehumeral stripes narrow, separated from lower end of dorsal carina by approximately three times their width at that level

    ⇒ species: Black-Winged Threadtail (Nososticta baroalba)
a ↑
b ↓
  • couplet drawing
  • ● Antehumeral stripes broad, separated from lower end of dorsal carina by approximately their own width at that level

    ⇒ species: Citrine Threadtail (Nososticta koongarra)

Australian distribution