DragonflyPix

Black Tigertail (Eusynthemis nigra)

The Black Tigertail (Eusynthemis nigra) is a dragonfly species of the family Synthemistidae, which contains 26 species in Australia.

The identification key to the family Synthemistidae consists of 26 couplets, 10 of which are pertinent to Eusynthemis nigra. 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.
 SynthemistidaeBlack Tigertail
(Eusynthemis nigra)
  • Synthemistidae: Key couplet 1 of 26

  • ○ Dark markings, if present, confined to basal parts of wings
  • b ↑
  • Synthemistidae: Key couplet 2 of 26

  • couplet drawing
  • ● Generally two to five crossveins in median space of all wings
  • b ↑
  • Synthemistidae: Key couplet 9 of 26

  • couplet drawing
  • ● An accessory thick antenodal in forewing in addition to the two primaries; this and the two previous alternating with thin antenodals
    ○ Male tergum 10 without pale dorsal cone
    ○ Ovipositor, if developed, not reaching beyond segment 9
  • b ↑
  • Synthemistidae: Key couplet 11 of 26

  • couplet drawing
  • ● Anterior frons pale, or pale with black stripe, often quite broad, in midline
  • b ↑
  • Synthemistidae: Key couplet 12 of 26

  • couplet drawing
  • ○ Frons broad
    ○ Membranule of both wings well developed
    ● Female ovipositor reduced to vulvar lamina or poorly developed

    ⇒ genus: Eusynthemis
  • b ↑
  • Synthemistidae: Key couplet 14 of 26

  • ○ Labrum black
  • b ↑
  • Synthemistidae: Key couplet 16 of 26

  • couplet drawing
  • ● Intermediary piece at base of each wing white or pale yellow
  • a ↑
  • Synthemistidae: Key couplet 17 of 26

  • couplet drawing
  • ● Front of synthorax dark except for pale dorsal carina
  • b ↑
  • Synthemistidae: Key couplet 18 of 26

  • couplet drawing
  • ● Metascutum dark brown to black
  • b ↑
  • Synthemistidae: Key couplet 20 of 26

  • couplet drawing
  • ● Top of frons black, anterior and lateral margins pale

    ⇒ species: Black Tigertail (Eusynthemis nigra)
  • a ↑
1  
  • Synthemistidae: Key couplet 1 of 26

  • ○ Wings with dark brown spots at nodus

    ⇒ species: Tasmanian Spotwing (Synthemiopsis gomphomacromioides)
a ↑
b ↓
  • ○ Dark markings, if present, confined to basal parts of wings

2  
  • Synthemistidae: Key couplet 2 of 26

  • couplet drawing
  • ● Generally one crossvein in median space, sometimes two in one or two wings
a ↑
b ↓
  • couplet drawing
  • ● Generally two to five crossveins in median space of all wings

3  
  • Synthemistidae: Key couplet 9 of 26

  • couplet drawing
    couplet drawingcouplet drawing
  • ● No accessory thick antenodal in forewing, only the two primaries present
    ● Male tergum 10 with posteriorly directed pale mid-dorsal cone
    ● Ovipositor reaching beyond segment 9

    ⇒ genus: Synthemis
a ↑
b ↓
  • couplet drawing
  • ● An accessory thick antenodal in forewing in addition to the two primaries; this and the two previous alternating with thin antenodals
    ○ Male tergum 10 without pale dorsal cone
    ○ Ovipositor, if developed, not reaching beyond segment 9

4  
  • Synthemistidae: Key couplet 11 of 26

  • couplet drawing
  • ● Anterior frons metallic black

    ⇒ species: Royal Tigertail (Parasynthemis regina)
a ↑
b ↓
  • couplet drawing
  • ● Anterior frons pale, or pale with black stripe, often quite broad, in midline

5  
  • Synthemistidae: Key couplet 12 of 26

  • couplet drawing
  • ○ Frons narrow
    ○ Membranule of both wings vestigial
    ● Female ovipositor well developed

    ⇒ genus: Choristhemis
a ↑
b ↓
  • couplet drawing
  • ○ Frons broad
    ○ Membranule of both wings well developed
    ● Female ovipositor reduced to vulvar lamina or poorly developed

    ⇒ genus: Eusynthemis

6  
  • Synthemistidae: Key couplet 14 of 26

  • ○ Labrum pale, with more or less extensive dark brown or black markings
a ↑
b ↓
  • ○ Labrum black

7  
  • Synthemistidae: Key couplet 16 of 26

  • couplet drawing
  • ● Intermediary piece at base of each wing white or pale yellow
a ↑
b ↓
  • couplet drawing
  • ● Intermediary piece brown or black

8  
  • Synthemistidae: Key couplet 17 of 26

  • couplet drawing
  • ● A large subtriangular yellow patch each side in basal half of front of synthorax

    ⇒ species: Pretty Tigertail (Eusynthemis netta)
a ↑
b ↓
  • couplet drawing
  • ● Front of synthorax dark except for pale dorsal carina

9  
  • Synthemistidae: Key couplet 18 of 26

  • couplet drawing
  • ● Metascutum yellow
a ↑
b ↓
  • couplet drawing
  • ● Metascutum dark brown to black

10  
  • Synthemistidae: Key couplet 20 of 26

  • couplet drawing
  • ● Top of frons black, anterior and lateral margins pale

    ⇒ species: Black Tigertail (Eusynthemis nigra)
a ↑
b ↓
  • couplet drawing
  • ● Top of frons black at base, continued into black midline between pair of conspicuous yellowish white anterior patches

Australian distribution