Pilbara Emerald (Hemicordulia koomina)

The Pilbara Emerald (Hemicordulia koomina) is a dragonfly species of the family Corduliidae, which contains 12 species in Australia.

The identification key to the family Corduliidae consists of 11 couplets, 7 of which are pertinent to Hemicordulia koomina. 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.
	Corduliidae	Pilbara Emerald (Hemicordulia koomina)	Corduliidae: Key couplet 1 of 11 ● Hypertriangles generally free b ↑ Corduliidae: Key couplet 2 of 11 ● Three crossveins between sectors of arculus basal to fork of Rs in hindwing ● Bridge crossvein at subnodus ● Ovipositor short, less than half length of tergum 9 ⇒ genus: Hemicordulia and Procordulia b ↑ Corduliidae: Key couplet 3 of 11 ● Top of frons yellow with dark T-mark, or black with pair of yellow spots b ↑ Corduliidae: Key couplet 8 of 11 ● Basal half or more of abdominal tergum 7 yellow, with or without narrow, mid-dorsal black line b ↑ Corduliidae: Key couplet 9 of 11 ● Top of frons with dark T-mark b ↑ Corduliidae: Key couplet 10 of 11 ● Male superior appendage with strong medioventral spine ○ Female anal appendages approximately 2 mm long b ↑ Corduliidae: Key couplet 11 of 11 ● Superior appendages similar in length to inferior appendage, not reflexed at tip ● Black distal band on abdominal tergum 7 of female occupying approximately 20% or less of mid-dorsal length of segment ⇒ species: Pilbara Emerald (Hemicordulia koomina) b ↑
1			Corduliidae: Key couplet 1 of 11 ● Hypertriangles of both wings crossed ⇒ species: Metallic Tigerhawk (Pentathemis membranulata) a ↑ b ↓ ● Hypertriangles generally free
2			Corduliidae: Key couplet 2 of 11 ● Two crossveins between sectors of arculus basal to fork of Rs in hindwing ● Bridge crossvein between subnodus and oblique vein ● Ovipositor long, spoon-like, extending to or beyond end of abdomen ⇒ species: Offshore Emerald (Metaphya tillyardi) a ↑ b ↓ ● Three crossveins between sectors of arculus basal to fork of Rs in hindwing ● Bridge crossvein at subnodus ● Ovipositor short, less than half length of tergum 9 ⇒ genus: Hemicordulia and Procordulia
3			Corduliidae: Key couplet 3 of 11 ● Top of frons brown or black with metallic blue-green reflections a ↑ b ↓ ● Top of frons yellow with dark T-mark, or black with pair of yellow spots
4			Corduliidae: Key couplet 8 of 11 ● Abdominal tergum 7 extensively black above, yellowish at sides ⇒ species: Tau Emerald (Hemicordulia tau) a ↑ b ↓ ● Basal half or more of abdominal tergum 7 yellow, with or without narrow, mid-dorsal black line
5			Corduliidae: Key couplet 9 of 11 ● Top of frons black with pale yellow spot on each side of midline ⇒ species: Superb Emerald (Hemicordulia superba) a ↑ b ↓ ● Top of frons with dark T-mark
6			Corduliidae: Key couplet 10 of 11 ● Male superior appendage lacking medioventral spine ○ Female anal appendages approximately 3 mm long ⇒ species: Desert Emerald (Hemicordulia flava) a ↑ b ↓ ● Male superior appendage with strong medioventral spine ○ Female anal appendages approximately 2 mm long
7			Corduliidae: Key couplet 11 of 11 ● Superior appendages markedly longer than inferior appendage, reflexed at tip ● Black distal band on abdominal tergum 7 of female occupying approximately 40-50% of mid-dorsal length of segment ⇒ species: Yellow-Spotted Emerald (Hemicordulia intermedia) a ↑ b ↓ ● Superior appendages similar in length to inferior appendage, not reflexed at tip ● Black distal band on abdominal tergum 7 of female occupying approximately 20% or less of mid-dorsal length of segment ⇒ species: Pilbara Emerald (Hemicordulia koomina)