○ Smaller, with abdomen shorter than 42 mm, hindwings shorter than 35 mm ● Fewer than 27 postnodals
b ↑
Megapodagrionidae: Key couplet 2 of 31
● 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
● Anterior frons, clypeus and labrum dark greenish brown to black
b ↑
Megapodagrionidae: Key couplet 6 of 31
● 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
● Humeral stripe not widened at upper end
b ↑
Megapodagrionidae: Key couplet 9 of 31
● Superior anal appendages with ventral spur not visible from above
b ↑
Megapodagrionidae: Key couplet 12 of 31
● 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
● Inferior anal appendages, viewed from below, almost triangular with sharply pointed tips
⇒ species: Common Flatwing (Austroargiolestes icteromelas)
b ↑
Megapodagrionidae: Key couplet 14 of 31
● 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
● 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
● Outer face of mandible largely pale
b ↑
Megapodagrionidae: Key couplet 18 of 31
● 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
● 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)