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Green-Blue Threadtail (Nososticta coelestina)

The Green-Blue Threadtail (Nososticta coelestina) 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, 12 of which are pertinent to Nososticta coelestina. 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.
 DisparoneurinaeGreen-Blue Threadtail
(Nososticta coelestina)
  • 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 blue, or blue and black
    ● Genae substantially blue
    ● Antehumeral stripes each occupying almost half the width of mesanepisternum, or more, narrowing above
  • b ↑
  • Disparoneurinae: Key couplet 9 of 23

  • couplet drawing
  • ● Antehumeral stripes greenish blue or blue, inner margins straight or concave, separated in midline by half or more of the maximum width of stripe
  • b ↑
  • Disparoneurinae: Key couplet 10 of 23

  • couplet drawing
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    couplet drawing
  • ● Superior anal appendages blue, broad in profile, their apices shallowly bifid
    ● Abdominal terga 3-5 with dorsal yellowish or greenish-blue basal spots, entirely or narrowly subdivided in midline, sometimes very small or absent
  • b ↑
  • Disparoneurinae: Key couplet 12 of 23

  • couplet drawing
  • ● Pale basal spots on terga 3-7 extending across mid-dorsal line

    ⇒ species: Green-Blue Threadtail (Nososticta coelestina)
  • b ↑
  • Disparoneurinae: Key couplet 13 of 23

  • couplet drawingcouplet drawing
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  • ● 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 drawing
  • ● Posterior lobe of pronotum without well-defined apex
  • b ↑
  • Disparoneurinae: Key couplet 22 of 23

  • couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum low, comprising two small, widely separated peaks
  • b ↑
  • Disparoneurinae: Key couplet 23 of 23

  • couplet drawingcouplet drawing
  • ● Hind part of posterior lobe of pronotum broad and shelf-like, its lateral tooth partly behind upright triangular flap of anterior part

    ⇒ species: Green-Blue Threadtail (Nososticta coelestina)
  • 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
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  • ● 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 Male only
  • Disparoneurinae: Key couplet 9 of 23

  • couplet drawing
  • ● Antehumeral stripes bright blue, occupying most of mesanepisterna, their inner margins straight, separated in midline by much less than half the maximum width of stripe

    ⇒ species: Citrine Threadtail (Nososticta koongarra)
a ↑
b ↓
  • couplet drawing
  • ● Antehumeral stripes greenish blue or blue, inner margins straight or concave, separated in midline by half or more of the maximum width of stripe

7 Male only
  • Disparoneurinae: Key couplet 10 of 23

  • couplet drawing
  • ● Superior anal appendages largely black, slender in profile, with single apex
    ○ Abdominal terga 3-5 with lateral, whitish basal spots, broadly separated in dorsal midline
    ○ Antehumeral stripes bright blue
a ↑
b ↓
  • couplet drawing
    couplet drawing
    couplet drawing
  • ● Superior anal appendages blue, broad in profile, their apices shallowly bifid
    ● Abdominal terga 3-5 with dorsal yellowish or greenish-blue basal spots, entirely or narrowly subdivided in midline, sometimes very small or absent

8 Male only
  • Disparoneurinae: Key couplet 12 of 23

  • couplet drawing
  • ● Pale basal spots on abdominal terga 4-7 often lacking, when present much reduced, divided by narrow black mid-dorsal line

    ⇒ species: Koolpinyah Threadtail (Nososticta koolpinyah)
a ↑
b ↓
  • couplet drawing
  • ● Pale basal spots on terga 3-7 extending across mid-dorsal line

    ⇒ species: Green-Blue Threadtail (Nososticta coelestina)

9 Female only
  • Disparoneurinae: Key couplet 13 of 23

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

10 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

11 Female only
  • Disparoneurinae: Key couplet 22 of 23

  • couplet drawing
  • ● Posterior lobe of pronotum a large, upright flap, almost flat, the upper margin variably emarginate in midline

    ⇒ species: Spot-Winged Threadtail (Nososticta kalumburu)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Posterior lobe of pronotum low, comprising two small, widely separated peaks

12 Female only
  • Disparoneurinae: Key couplet 23 of 23

  • couplet drawingcouplet drawing
  • ● Hind part of posterior lobe of pronotum broad and shelf-like, its lateral tooth partly behind upright triangular flap of anterior part

    ⇒ species: Green-Blue Threadtail (Nososticta coelestina)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Hind part of posterior lobe of pronotum narrower, scarcely shelf-like, its lateral tooth lying behind upright triangular flap of anterior part

    ⇒ species: Koolpinyah Threadtail (Nososticta koolpinyah)

Australian distribution