DragonflyPix

Common Flatwing (Austroargiolestes icteromelas)

The Common Flatwing (Austroargiolestes icteromelas) is a damselfly species of the family Megapodagrionidae, which contains 22 species in Australia.

The identification key to the family Megapodagrionidae consists of 31 couplets, 14 of which are pertinent to Austroargiolestes icteromelas. 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.
 MegapodagrionidaeCommon Flatwing
(Austroargiolestes icteromelas)
  • Megapodagrionidae: Key couplet 1 of 31

  • couplet drawing
  • ○ Smaller, with abdomen shorter than 42 mm, hindwings shorter than 35 mm
    ● Fewer than 27 postnodals
  • b ↑
  • Megapodagrionidae: Key couplet 2 of 31

  • couplet drawingcouplet drawing
  • ● Generally three or more cells, rarely two in discoidal field between discoidal cell and level of subnodus
    ● Male superior anal appendages with ventral spur

    ⇒ genus: Austroargiolestes
  • a ↑
  • Megapodagrionidae: Key couplet 3 of 31

  • couplet drawing
  • ● Anterior frons, clypeus and labrum dark greenish brown to black
  • b ↑
  • Megapodagrionidae: Key couplet 6 of 31

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Median part to much of front of synthorax dark brown to black with pale to yellowish brown humeral stripe on each side, sometimes pruinescent
  • b ↑
  • Megapodagrionidae: Key couplet 7 of 31

  • couplet drawing
  • ● Humeral stripe not widened at upper end
  • b ↑
  • Megapodagrionidae: Key couplet 9 of 31

  • couplet drawing
  • ● Superior anal appendages with ventral spur not visible from above
  • b ↑
  • Megapodagrionidae: Key couplet 12 of 31

  • couplet drawingcouplet drawing
  • ● Distal end of inner marginal ridge of superior appendages rounded, or continuing into inner ridge of ventral spur
  • b ↑
  • Megapodagrionidae: Key couplet 13 of 31

  • couplet drawing
  • ● Inferior anal appendages, viewed from below, almost triangular with sharply pointed tips

    ⇒ species: Common Flatwing (Austroargiolestes icteromelas)
  • b ↑
  • Megapodagrionidae: Key couplet 14 of 31

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Median part to much of front of synthorax dark brown to black, with pale to red-brown humeral stripe on each side, sometimes pruinescent
  • b ↑
  • Megapodagrionidae: Key couplet 15 of 31

  • couplet drawing
  • ● Pale stripe in front of mesopleural suture constricted near upper end, then broadened at tip, not obscured by pruinescence
  • a ↑
  • Megapodagrionidae: Key couplet 17 of 31

  • couplet drawing
  • ● Outer face of mandible largely pale
  • b ↑
  • Megapodagrionidae: Key couplet 18 of 31

  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Uppermost point of mesanepisternal part of humeral stripe at mesopleural suture, the upper part of stripe thus appearing acutely tapered
    ● Sometimes obscured by pruinescence
  • b ↑
  • Megapodagrionidae: Key couplet 19 of 31

  • couplet drawingcouplet drawingcouplet drawing
  • ● Black patch on metepimeron extending well beyond half-way down upper segment of metapleural suture, or separated from it by long gently tapering white stripe
  • b ↑
  • Megapodagrionidae: Key couplet 20 of 31

  • ○ Ratio between length of hindwing and length of metafemur approximately 5.0 (range 4.5 to 5.5)
    ○ Front of synthorax never strongly pruinescent

    ⇒ species: Common Flatwing (Austroargiolestes icteromelas)
  • a ↑
1  
  • Megapodagrionidae: Key couplet 1 of 31

  • couplet drawing
  • ○ Large, with abdomen longer than 42 mm
    ○ hindwings longer than 40 mm
    ● More than 27 postnodals

    ⇒ species: Treehole Flatwing (Podopteryx selysi)
a ↑
b ↓
  • couplet drawing
  • ○ Smaller, with abdomen shorter than 42 mm, hindwings shorter than 35 mm
    ● Fewer than 27 postnodals

2  
  • Megapodagrionidae: Key couplet 2 of 31

  • couplet drawingcouplet drawing
  • ● Generally three or more cells, rarely two in discoidal field between discoidal cell and level of subnodus
    ● Male superior anal appendages with ventral spur

    ⇒ genus: Austroargiolestes
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Generally two, sometimes three, cells in discoidal field between discoidal cell and level of subnodus
    ● Male superior anal appendage without ventral spur

3  
  • Megapodagrionidae: Key couplet 3 of 31

  • couplet drawing
  • ● Anterior frons and postclypeus largely pale, yellowish or reddish orange
a ↑
b ↓
  • couplet drawing
  • ● Anterior frons, clypeus and labrum dark greenish brown to black

4 Male only
  • Megapodagrionidae: Key couplet 6 of 31

  • couplet drawing
  • ● Front of synthorax almost completely pale, yellow to orange, not pruinescent

    ⇒ species: Golden Flatwing (Austroargiolestes chrysoides)
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Median part to much of front of synthorax dark brown to black with pale to yellowish brown humeral stripe on each side, sometimes pruinescent

5 Male only
  • Megapodagrionidae: Key couplet 7 of 31

  • couplet drawing
  • ● Humeral stripe constricted near upper end, then broadened at tip
a ↑
b ↓
  • couplet drawing
  • ● Humeral stripe not widened at upper end

6 Male only
  • Megapodagrionidae: Key couplet 9 of 31

  • couplet drawingcouplet drawing
  • ● Superior anal appendages with tip of ventral spur visible from above
a ↑
b ↓
  • couplet drawing
  • ● Superior anal appendages with ventral spur not visible from above

7 Male only
  • Megapodagrionidae: Key couplet 12 of 31

  • couplet drawingcouplet drawing
  • ● Distal end of inner marginal ridge of superior appendages ending in sharp point above ventral spur

    ⇒ species: Powdered Flatwing (Austroargiolestes calcaris) (some)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Distal end of inner marginal ridge of superior appendages rounded, or continuing into inner ridge of ventral spur

8 Male only
  • Megapodagrionidae: Key couplet 13 of 31

  • couplet drawing
  • ● Inferior anal appendages, viewed from below, broad, blunt, rounded apically

    ⇒ species: Milky Flatwing (Austroargiolestes christine)
a ↑
b ↓
  • couplet drawing
  • ● Inferior anal appendages, viewed from below, almost triangular with sharply pointed tips

    ⇒ species: Common Flatwing (Austroargiolestes icteromelas)

9 Female only
  • Megapodagrionidae: Key couplet 14 of 31

  • couplet drawing
  • ● Front of synthorax almost completely pale yellow to white

    ⇒ species: Golden Flatwing (Austroargiolestes chrysoides) (possibly teneral specimens)
a ↑
b ↓
  • couplet drawing
    couplet drawingcouplet drawing
  • ● Median part to much of front of synthorax dark brown to black, with pale to red-brown humeral stripe on each side, sometimes pruinescent

10 Female only
  • Megapodagrionidae: Key couplet 15 of 31

  • couplet drawing
  • ● Pale stripe in front of mesopleural suture constricted near upper end, then broadened at tip, not obscured by pruinescence
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Pale stripe in front of mesopleural suture not widened at tip, its inner margin commonly converging on mesopleural suture, sometimes obscured by pruinescence

11 Female only
  • Megapodagrionidae: Key couplet 17 of 31

  • couplet drawing
  • ● Outer face of mandible very dark brown to black

    ⇒ species: Azure Flatwing (Austroargiolestes elke)
a ↑
b ↓
  • couplet drawing
  • ● Outer face of mandible largely pale

12 Female only
  • Megapodagrionidae: Key couplet 18 of 31

  • couplet drawing
  • ● Uppermost point of mesanepisternal part of humeral stripe not at mesopleural suture, so that upper end of stripe appears peaked or truncate
    ● Not pruinescent

    ⇒ species: Golden Flatwing (Austroargiolestes chrysoides)
a ↑
b ↓
  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ● Uppermost point of mesanepisternal part of humeral stripe at mesopleural suture, the upper part of stripe thus appearing acutely tapered
    ● Sometimes obscured by pruinescence

13 Female only
  • Megapodagrionidae: Key couplet 19 of 31

  • couplet drawing
  • ● Black patch on metepimeron extending half-way down segment of metapleural suture above metastigma, its lower end usually truncate or bluntly angled

    ⇒ species: Sydney Flatwing (Austroargiolestes isabellae)
a ↑
b ↓
  • couplet drawingcouplet drawingcouplet drawing
  • ● Black patch on metepimeron extending well beyond half-way down upper segment of metapleural suture, or separated from it by long gently tapering white stripe

14 Female only
  • Megapodagrionidae: Key couplet 20 of 31

  • ○ Ratio between length of hindwing and length of metafemur approximately 5.0 (range 4.5 to 5.5)
    ○ Front of synthorax never strongly pruinescent

    ⇒ species: Common Flatwing (Austroargiolestes icteromelas)
a ↑
b ↓
  • ○ Ratio between length of hindwing and length of metafemur approximately 4.3 (range 4.0-4.6)
    ○ Mature adults with front of synthorax strongly pruinescent

Australian distribution