Arrowhead Rockmaster (Diphlebia nymphoides)

The Arrowhead Rockmaster (Diphlebia nymphoides) is a damselfly species of the family Diphlebiidae, which contains 5 species in Australia.

The identification key to the family Diphlebiidae consists of 9 couplets, 6 of which are pertinent to Diphlebia nymphoides. 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.
	Diphlebiidae	Arrowhead Rockmaster (Diphlebia nymphoides)	Diphlebiidae: Key couplet 2 of 9 ● Terga 4-6 black above, at least in midline a ↑ Diphlebiidae: Key couplet 3 of 9 ● Terga 4-6 with blue patch on each side, more than half length of tergum ⇒ species: Arrowhead Rockmaster (Diphlebia nymphoides) a ↑ Diphlebiidae: Key couplet 6 of 9 ● Abdominal terga 4-7 with or without black mid-dorsal line ● Segments 8, 9 black with pale markings b ↑ Diphlebiidae: Key couplet 7 of 9 ● Dark mid-dorsal line on terga 2 and 3 considerably narrower than on terga 4-7, or missing, distal black dorsal patch on segments 4-6 more or less onion-shaped, rounded at sides b ↑ Diphlebiidae: Key couplet 8 of 9 ● Mid-dorsal stripe on tergum 3 narrow in front, broadening progressively towards swollen spot at end of segment ○ South of Paluma-Eungella gap b ↑ Diphlebiidae: Key couplet 9 of 9 ● Pale lateral stripe on terga 4-7 narrow, sharply downcurved in front, forming L-shape ⇒ species: Arrowhead Rockmaster (Diphlebia nymphoides) a ↑
1		Male only	Diphlebiidae: Key couplet 2 of 9 ● Terga 4-6 black above, at least in midline a ↑ b ↓ ○ Terga 4-6 largely blue or grey above, without broad, mid-dorsal black stripe
2		Male only	Diphlebiidae: Key couplet 3 of 9 ● Terga 4-6 with blue patch on each side, more than half length of tergum ⇒ species: Arrowhead Rockmaster (Diphlebia nymphoides) a ↑ b ↓ ● Terga 4-6 with or without blue basal spot on each side, no more than quarter length of tergum
3		Female only	Diphlebiidae: Key couplet 6 of 9 ● Abdominal terga 4-7 without black mid-dorsal line, or with line of darkening confined to dorsal ridge ● Segments 8-10 entirely black ⇒ species: Giant Rockmaster (Diphlebia hybridoides) a ↑ b ↓ ● Abdominal terga 4-7 with or without black mid-dorsal line ● Segments 8, 9 black with pale markings
4		Female only	Diphlebiidae: Key couplet 7 of 9 ● Dark mid-dorsal line, if present, of almost uniform width on terga 2-7, except for transverse black bar on supplementary transverse carina, sometimes extending to end of segment ⇒ species: Whitewater Rockmaster (Diphlebia lestoides) a ↑ b ↓ ● Dark mid-dorsal line on terga 2 and 3 considerably narrower than on terga 4-7, or missing, distal black dorsal patch on segments 4-6 more or less onion-shaped, rounded at sides
5		Female only	Diphlebiidae: Key couplet 8 of 9 ● Mid-dorsal stripe on tergum 3 a very narrow line, or lacking ○ North of Paluma-Eungella gap ⇒ species: Tropical Rockmaster (Diphlebia euphoeoides) a ↑ b ↓ ● Mid-dorsal stripe on tergum 3 narrow in front, broadening progressively towards swollen spot at end of segment ○ South of Paluma-Eungella gap
6		Female only	Diphlebiidae: Key couplet 9 of 9 ● Pale lateral stripe on terga 4-7 narrow, sharply downcurved in front, forming L-shape ⇒ species: Arrowhead Rockmaster (Diphlebia nymphoides) a ↑ b ↓ ● Pale lateral stripe on terga 4-7 broad, slightly widened basally ⇒ species: Sapphire Rockmaster (Diphlebia coerulescens)