DragonflyPix

Water Prince (Hydrobasileus brevistylus)

The Water Prince (Hydrobasileus brevistylus) is a dragonfly species of the family Libellulidae, which contains 56 species in Australia.

The identification key to the family Libellulidae consists of 67 couplets, 10 of which are pertinent to Hydrobasileus brevistylus. 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.
 LibellulidaeWater Prince
(Hydrobasileus brevistylus)
  • Libellulidae: Key couplet 1 of 67

  • couplet drawing
  • ● Distal antenodal of forewing incomplete, only the costal section present
  • b ↑
  • Libellulidae: Key couplet 35 of 67

  • couplet drawing
  • ● Hindwing triangle free
  • b ↑
  • Libellulidae: Key couplet 39 of 67

  • ○ Not as above
  • b ↑
  • Libellulidae: Key couplet 40 of 67

  • couplet drawing
  • ● Base of hindwing triangle at or slightly proximal to arculus
  • b ↑
  • Libellulidae: Key couplet 41 of 67

  • couplet drawing
  • ● Tip of anal loop closed, the bounding veins meeting midvein one row of cells away from wing margin
  • b ↑
  • Libellulidae: Key couplet 45 of 67

  • couplet drawingcouplet drawing
  • ● Subtriangle of forewing with one to three cells, its basal side well-defined
  • a ↑
  • Libellulidae: Key couplet 45 of 67

  • couplet drawingcouplet drawing
  • ● Basal side of forewing subtriangle poorly defined
    ● If recognisable, containing more than three cells
  • b ↑
  • Libellulidae: Key couplet 46 of 67

  • ○ Large dragonflies, hindwing longer than 38 mm
    ○ Male abdomen black, with dorsal pairs of yellow spots

    ⇒ species: Water Prince (Hydrobasileus brevistylus) (part)
  • a ↑
  • Libellulidae: Key couplet 56 of 67

  • ○ Wing membrane hyaline or yellow, with, at most, dark markings at extreme wing tip, beyond pterostigma
  • a ↑
  • Libellulidae: Key couplet 57 of 67

  • ○ Abdomen black, with dorsal pair of yellow spots

    ⇒ species: Water Prince (Hydrobasileus brevistylus) (part)
  • a ↑
1  
  • Libellulidae: Key couplet 1 of 67

  • couplet drawing
  • ● Distal antenodal of forewing complete, both costal and subcostal sections present
a ↑
b ↓
  • couplet drawing
  • ● Distal antenodal of forewing incomplete, only the costal section present

2  
  • Libellulidae: Key couplet 35 of 67

  • couplet drawing
  • ● Hindwing triangle crossed
a ↑
b ↓
  • couplet drawing
  • ● Hindwing triangle free

3  
  • Libellulidae: Key couplet 39 of 67

  • couplet drawingcouplet drawing
  • ○ Small (hindwing c. 25 mm)
    ● Synthorax and abdomen black with well-defined pale yellowish-green markings

    ⇒ species: Forestwatcher (Huonia melvillensis) (part)
a ↑
b ↓
  • ○ Not as above

4  
  • Libellulidae: Key couplet 40 of 67

  • couplet drawing
  • ● Base of hindwing triangle well beyond arculus

    ⇒ species: Spiny-Chested Percher (Raphismia bispina)
a ↑
b ↓
  • couplet drawing
  • ● Base of hindwing triangle at or slightly proximal to arculus

5  
  • Libellulidae: Key couplet 41 of 67

  • couplet drawing
  • ● Tip of anal loop usually open on one or both sides of midvein, the bounding veins of loop extending to wing margin, occasionally closed, the bounding veins meeting at wing margin
a ↑
b ↓
  • couplet drawing
  • ● Tip of anal loop closed, the bounding veins meeting midvein one row of cells away from wing margin

6 (part)
  • Libellulidae: Key couplet 45 of 67

  • couplet drawingcouplet drawing
  • ● Subtriangle of forewing with one to three cells, its basal side well-defined
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Basal side of forewing subtriangle poorly defined
    ● If recognisable, containing more than three cells

7 (part)
  • Libellulidae: Key couplet 45 of 67

  • couplet drawingcouplet drawing
  • ● Subtriangle of forewing with one to three cells, its basal side well-defined
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Basal side of forewing subtriangle poorly defined
    ● If recognisable, containing more than three cells

8  
  • Libellulidae: Key couplet 46 of 67

  • ○ Large dragonflies, hindwing longer than 38 mm
    ○ Male abdomen black, with dorsal pairs of yellow spots

    ⇒ species: Water Prince (Hydrobasileus brevistylus) (part)
a ↑
b ↓
  • ○ Smaller dragonflies, hindwing shorter than 38 mm

9  
  • Libellulidae: Key couplet 56 of 67

  • ○ Wing membrane hyaline or yellow, with, at most, dark markings at extreme wing tip, beyond pterostigma
a ↑
b ↓
  • ○ Wing membrane with reddish-brown, dark brown or black markings, at least at base of hindwing

10  
  • Libellulidae: Key couplet 57 of 67

  • ○ Abdomen black, with dorsal pair of yellow spots

    ⇒ species: Water Prince (Hydrobasileus brevistylus) (part)
a ↑
b ↓
  • ○ Abdomen brownish yellow to orange red, with black markings on some segments

Australian distribution