Grey-Chested Flatwing (Griseargiolestes eboracus)

The Grey-Chested Flatwing (Griseargiolestes eboracus) 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, 7 of which are pertinent to Griseargiolestes eboracus. 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.

#	Family	Species	Couplet No.
	Megapodagrionidae	Grey-Chested Flatwing (Griseargiolestes eboracus)	Megapodagrionidae: Key couplet 1 of 31 ○ Smaller, with abdomen shorter than 42 mm, hindwings shorter than 35 mm ● Fewer than 27 postnodals b ↑ Megapodagrionidae: Key couplet 2 of 31 ● Generally two, sometimes three, cells in discoidal field between discoidal cell and level of subnodus ● Male superior anal appendage without ventral spur b ↑ Megapodagrionidae: Key couplet 22 of 31 ● Pale humeral stripe well developed, conspicuous ○ From eastern Australia ⇒ genus: Griseargiolestes a ↑ Megapodagrionidae: Key couplet 23 of 31 ○ Labium pale b ↑ Megapodagrionidae: Key couplet 24 of 31 ● Black marking on metepimeron much more extensive, occupying approximately half of width and at least one third of length of epimeron b ↑ Megapodagrionidae: Key couplet 27 of 31 ● Mesepimeral portion of humeral stripe narrow, scarcely wider than the adjacent part of episternal portion ● Pale marks on sides of median and posterior lobes of pronotum widely separated b ↑ Megapodagrionidae: Key couplet 28 of 31 ● Yellow patch along the intersegmental suture triangular and the dorsal two-thirds of the adjacent black bar almost parallel-sided ● Pterostigma generally markedly paler with the posterior side approximately twice as long as the distal or proximal side ○ Pruinescence restricted to the front of the thorax ⇒ species: Grey-Chested Flatwing (Griseargiolestes eboracus) a ↑
1			Megapodagrionidae: Key couplet 1 of 31 ○ Large, with abdomen longer than 42 mm ○ hindwings longer than 40 mm ● More than 27 postnodals ⇒ species: Treehole Flatwing (Podopteryx selysi) a ↑ b ↓ ○ Smaller, with abdomen shorter than 42 mm, hindwings shorter than 35 mm ● Fewer than 27 postnodals
2			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 ↑ b ↓ ● 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 22 of 31 ● Pale humeral stripe well developed, conspicuous ○ From eastern Australia ⇒ genus: Griseargiolestes a ↑ b ↓ ● Pale humeral stripe vestigial or absent ○ From south-western Australia
4			Megapodagrionidae: Key couplet 23 of 31 ○ Labium dark brown to black ⇒ species: Springs Flatwing (Griseargiolestes fontanus) a ↑ b ↓ ○ Labium pale
5			Megapodagrionidae: Key couplet 24 of 31 ● Black marking on metepimeron reduced to a small patch, occupying less than one third of length and width of epimeron a ↑ b ↓ ● Black marking on metepimeron much more extensive, occupying approximately half of width and at least one third of length of epimeron
6			Megapodagrionidae: Key couplet 27 of 31 ● Mesepimeral portion of humeral stripe substantial, much wider than the adjacent part of episternal portion ● Pale lateral marks on median and posterior lobes of pronotum fused ⇒ species: Grey Flatwing (Griseargiolestes griseus) a ↑ b ↓ ● Mesepimeral portion of humeral stripe narrow, scarcely wider than the adjacent part of episternal portion ● Pale marks on sides of median and posterior lobes of pronotum widely separated
7			Megapodagrionidae: Key couplet 28 of 31 ● Yellow patch along the intersegmental suture triangular and the dorsal two-thirds of the adjacent black bar almost parallel-sided ● Pterostigma generally markedly paler with the posterior side approximately twice as long as the distal or proximal side ○ Pruinescence restricted to the front of the thorax ⇒ species: Grey-Chested Flatwing (Griseargiolestes eboracus) a ↑ b ↓ ● Yellow patch along the intersegmental suture anterodorsally rather evenly curved and the dorsal third of the adjacent black bar distinctly conical ● Pterostigma generally markedly darker with the posterior side approximately 1.5 times as long as the distal or proximal side ○ Pruinescence occurs over almost the whole insect ⇒ species: Alpine Flatwing (Griseargiolestes intermedius)