DragonflyPix

Western Pygmyfly (Nannophya occidentalis)

The Western Pygmyfly (Nannophya occidentalis) 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, 7 of which are pertinent to Nannophya occidentalis. 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.
 LibellulidaeWestern Pygmyfly
(Nannophya occidentalis)
  • Libellulidae: Key couplet 1 of 67

  • couplet drawing
  • ● Distal antenodal of forewing complete, both costal and subcostal sections present
  • a ↑
  • Libellulidae: Key couplet 2 of 67

  • couplet drawing
  • ● Hindwing lacking anal loop

    ⇒ genus: Nannophya
  • a ↑
  • Libellulidae: Key couplet 3 of 67

  • couplet drawing
  • ● Only one crossvein (Ac) in cubital space of hindwing
  • b ↑
  • Libellulidae: Key couplet 5 of 67

  • couplet drawing
  • ● Abdominal tergum 3 lacking mid-dorsal dark stripe
  • b ↑
  • Libellulidae: Key couplet 6 of 67

  • couplet drawing
  • ● Abdominal terga 1 and 2 marked dark brown to black above

    ⇒ species: Western Pygmyfly (Nannophya occidentalis)
  • b ↑
  • Libellulidae: Key couplet 7 of 67

  • couplet drawing
  • ● Abdomen with irregular, dark mid-dorsal band
  • b ↑
  • Libellulidae: Key couplet 8 of 67

  • couplet drawing
  • ● Black stripe on metapleural suture broad behind metastigma

    ⇒ species: Western Pygmyfly (Nannophya occidentalis)
  • b ↑
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 2 of 67

  • couplet drawing
  • ● Hindwing lacking anal loop

    ⇒ genus: Nannophya
a ↑
b ↓
  • couplet drawingcouplet drawing
  • ● Anal loop present

3  
  • Libellulidae: Key couplet 3 of 67

  • couplet drawing
  • ● Two to three crossveins in cubital space of hindwing (including Ac)

    ⇒ species: Australian Pygmyfly (Nannophya australis)
a ↑
b ↓
  • couplet drawing
  • ● Only one crossvein (Ac) in cubital space of hindwing

4 Male only
  • Libellulidae: Key couplet 5 of 67

  • couplet drawing
  • ● Mid-dorsal dark line present on abdominal terga 2-3, sometimes more extensive

    ⇒ species: Eastern Pygmyfly (Nannophya dalei)
a ↑
b ↓
  • couplet drawing
  • ● Abdominal tergum 3 lacking mid-dorsal dark stripe

5 Male only
  • Libellulidae: Key couplet 6 of 67

  • ○ Abdominal terga entirely red

    ⇒ species: Scarlet Pygmyfly (Nannophya paulsoni)
a ↑
b ↓
  • couplet drawing
  • ● Abdominal terga 1 and 2 marked dark brown to black above

    ⇒ species: Western Pygmyfly (Nannophya occidentalis)

6 Female only
  • Libellulidae: Key couplet 7 of 67

  • couplet drawing
  • ● Abdominal terga 2-4 pale in front of supplementary transverse carina, reddish brown behind

    ⇒ species: Scarlet Pygmyfly (Nannophya paulsoni)
a ↑
b ↓
  • couplet drawing
  • ● Abdomen with irregular, dark mid-dorsal band

7  
  • Libellulidae: Key couplet 8 of 67

  • couplet drawing
  • ● Black stripe on metapleural suture much narrower at level of metastigma than in upper half

    ⇒ species: Eastern Pygmyfly (Nannophya dalei)
a ↑
b ↓
  • couplet drawing
  • ● Black stripe on metapleural suture broad behind metastigma

    ⇒ species: Western Pygmyfly (Nannophya occidentalis)

Australian distribution