DragonflyPix

Dune Glider (Tramea eurybia)

The Dune Glider (Tramea eurybia) 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, 11 of which are pertinent to Tramea eurybia. 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.
 LibellulidaeDune Glider
(Tramea eurybia)
  • 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
  • ● Basal side of forewing subtriangle poorly defined
    ● If recognisable, containing more than three cells
  • b ↑
  • Libellulidae: Key couplet 56 of 67

  • ○ Wing membrane with reddish-brown, dark brown or black markings, at least at base of hindwing
  • b ↑
  • Libellulidae: Key couplet 59 of 67

  • ○ Wing membrane hyaline except for narrow to broad, dark reddish-brown patch at base of hindwing and variable, small reddish patch at base of forewing, often lacking
    ○ Male abdomen orange-red, red, or reddish-brown, the last few segments marked with black

    ⇒ genus: Tramea
  • a ↑
  • Libellulidae: Key couplet 60 of 67

  • couplet drawing
  • ● Dark mark at base of hindwing broader, generally reaching to or beyond base of triangle
    ● If not, clear patch behind membranule broad, extending well beyond level of first vein descending into anal field
  • b ↑
  • Libellulidae: Key couplet 61 of 67

  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ○ Synthorax almost uniformly red, top of pleural sutures darkened
    ● Male genital hamule, when retracted, extending well beyond end of genital lobe
    ● Vulvar scale of female more than 1.8 mm long, reaching to or beyond end of segment 9
  • b ↑
  • Libellulidae: Key couplet 62 of 67

  • couplet drawingcouplet drawing
  • ● Hamule 1.7-2.2 mm long when retracted
    ● Male genital lobe relatively broad, length:breadth 1.2 to 1.5, posterior margin rounded
    ● End of vulvar scale reaching to, or almost to, end of tergum 9

    ⇒ species: Dune Glider (Tramea eurybia)
  • 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  
  • 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  
  • 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

8  
  • Libellulidae: Key couplet 59 of 67

  • ○ Wing membrane hyaline except for narrow to broad, dark reddish-brown patch at base of hindwing and variable, small reddish patch at base of forewing, often lacking
    ○ Male abdomen orange-red, red, or reddish-brown, the last few segments marked with black

    ⇒ genus: Tramea
a ↑
b ↓
  • ○ Both forewing and hindwing with dark brown to black markings
    ○ Male abdomen black

    ⇒ genus: Rhyothemis

9  
  • Libellulidae: Key couplet 60 of 67

  • couplet drawing
  • ● Dark mark at base of hindwing narrow, elongate, not extending far beyond Ac, and not reaching base of triangle
    ● Clear patch behind membranule, if present, narrow, not extending beyond level of first vein descending into anal field

    ⇒ species: Northern Glider (Tramea propinqua)
a ↑
b ↓
  • couplet drawing
  • ● Dark mark at base of hindwing broader, generally reaching to or beyond base of triangle
    ● If not, clear patch behind membranule broad, extending well beyond level of first vein descending into anal field

10  
  • Libellulidae: Key couplet 61 of 67

  • couplet drawing
    couplet drawingcouplet drawing
  • ● Areas along sutures on side of synthorax darker than areas between them, giving impression of two dull yellowish to brown stripes on dark purplish background
    ● Male genital hamule, when retracted, only slightly longer than genital lobe
    ● Vulvar scale of female less than 1.8 mm long, not reaching end of abdominal segment 9

    ⇒ species: Common Glider (Tramea loewii)
a ↑
b ↓
  • couplet drawingcouplet drawing
    couplet drawingcouplet drawing
  • ○ Synthorax almost uniformly red, top of pleural sutures darkened
    ● Male genital hamule, when retracted, extending well beyond end of genital lobe
    ● Vulvar scale of female more than 1.8 mm long, reaching to or beyond end of segment 9

11  
  • Libellulidae: Key couplet 62 of 67

  • couplet drawingcouplet drawing
  • ● Hamule 1.7-2.2 mm long when retracted
    ● Male genital lobe relatively broad, length:breadth 1.2 to 1.5, posterior margin rounded
    ● End of vulvar scale reaching to, or almost to, end of tergum 9

    ⇒ species: Dune Glider (Tramea eurybia)
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Hamule 2.1-2.5 mm long when retracted
    ● Male genital lobe relatively narrow, length:breadth 1.4 to 2.0, tending to be parallel-sided
    ● Vulvar scale ending at or beyond end of tergum 9

    ⇒ species: Narrow-Lobed Glider (Tramea stenoloba)

Australian distribution