DragonflyPix

Square-Spot Basker (Aethriamanta circumsignata)

The Square-Spot Basker (Aethriamanta circumsignata) 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, 9 of which are pertinent to Aethriamanta circumsignata. 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.
 LibellulidaeSquare-Spot Basker
(Aethriamanta circumsignata)
  • 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 drawingcouplet drawing
  • ● Anal loop present
  • b ↑
  • Libellulidae: Key couplet 9 of 67

  • couplet drawing
  • ● Anal loop well developed, generally stocking-shaped, usually closed at tip
  • b ↑
  • Libellulidae: Key couplet 14 of 67

  • ○ Not as above
  • b ↑
  • Libellulidae: Key couplet 15 of 67

  • couplet drawing
  • ● Base of hindwing triangle at or proximal to arculus
    ○ Top of frons, if metallic, dully so
  • b ↑
  • Libellulidae: Key couplet 20 of 67

  • ○ Smaller dragonflies, hindwing up to 40 mm long
    ○ Wings patterned or hyaline
  • b ↑
  • Libellulidae: Key couplet 21 of 67

  • couplet drawing
  • ● Subtriangle of forewing single-celled
  • a ↑
  • Libellulidae: Key couplet 22 of 67

  • couplet drawing
  • ● Sectors of arculus, particularly in forewing, fused for only a short distance, separating well before level of second antenodal crossvein

    ⇒ genus: Aethriamanta
  • a ↑
  • Libellulidae: Key couplet 23 of 67

  • couplet drawing
  • ● Base of hindwing extensively marked with dark brown between C and R+M, CuP and 1A, and in the anal field, commonly extending to or beyond level of arculus

    ⇒ species: Square-Spot Basker (Aethriamanta circumsignata)
  • 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 2 of 67

  • couplet drawing
  • ● Hindwing lacking anal loop

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

3  
  • Libellulidae: Key couplet 9 of 67

  • couplet drawing
  • ● Anal loop rounded, poorly developed, of three to five cells
a ↑
b ↓
  • couplet drawing
  • ● Anal loop well developed, generally stocking-shaped, usually closed at tip

4  
  • Libellulidae: Key couplet 14 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

5  
  • Libellulidae: Key couplet 15 of 67

  • couplet drawing
  • ● Base of hindwing triangle just beyond to well beyond arculus
    ○ Top of frons brilliant metallic blue or green, particularly in male
a ↑
b ↓
  • couplet drawing
  • ● Base of hindwing triangle at or proximal to arculus
    ○ Top of frons, if metallic, dully so

6  
  • Libellulidae: Key couplet 20 of 67

  • ○ Large dragonflies, hindwing 45 mm or longer, wing membrane extensively marked with reddish- or blackish-brown

    ⇒ species: Black Knight (Camacinia othello) (part)
a ↑
b ↓
  • ○ Smaller dragonflies, hindwing up to 40 mm long
    ○ Wings patterned or hyaline

7  
  • Libellulidae: Key couplet 21 of 67

  • couplet drawing
  • ● Subtriangle of forewing single-celled
a ↑
b ↓
  • couplet drawing
  • ● Subtriangle of forewing with three or more cells

8  
  • Libellulidae: Key couplet 22 of 67

  • couplet drawing
  • ● Sectors of arculus, particularly in forewing, fused for only a short distance, separating well before level of second antenodal crossvein

    ⇒ genus: Aethriamanta
a ↑
b ↓
  • couplet drawing
  • ● Fusion of sectors of arculus more extensive, stalk extending to level of second antenodal crossvein

    ⇒ species: Pygmy Percher (Nannodiplax rubra)

9  
  • Libellulidae: Key couplet 23 of 67

  • couplet drawing
  • ● Base of hindwing extensively marked with dark brown between C and R+M, CuP and 1A, and in the anal field, commonly extending to or beyond level of arculus

    ⇒ species: Square-Spot Basker (Aethriamanta circumsignata)
a ↑
b ↓
  • couplet drawing
  • ● Base of hindwing often marked only with yellow, otherwise with dark brown marks restricted to L-shaped patch consisting of bar between CuP and 1A and stripe at extreme base of anal field, with or without dark fleck between Sc and R+M

    ⇒ species: L-Spot Basker (Aethriamanta nymphaeae)

Australian distribution