Navy Dropwing, Trithemis furva, Blouvalvlerkie

MaleMale

Young Male Young Male

femal Broken wing Female

Short description: 

Navy Dropwing, Trithemis furva, Blouvalvlerkie is medium sized and all dark blue with yellow facial markings.

Family Libellulidae Leach, 1815

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More mages:
 Wing Venation

Explain complete and incomplete Ax veins

Annotated Images of complete and incomplete Ax veins Ax Navy DropwingWing venation

 

 

 

 

 

Key identification features:

Male:100 932 Trithemis furva Navy Dropwing Male Kloofzight GP RSA Oct 2016r 2

  • Face light yellowish brown, dark brown and black. 100 2905 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 9  100 2906 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 11   Labium pale yellow with wide central black stripe. Labrum black. Anteclypeus light creamy to brown. Postclypeus dark brown at back, light yellow brown at sides. Frons dark brown in front, light yellowish brown at sides. Frons above and top of head dimpled, metallic bluish purple
  • Eyes dark purplish brown, lighter below.  100 2905 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 9 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019
  • Thorax dark blue can have a purplish undertone Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019 100 2904 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 8 
  • Abdomen dark blue yellow and black when young. Trithemis furva Navy Dropwing Young Male Close up MP RSA Sep 2018When old becoming dark blue with the yellow stripes fading with age to become dark blue with age. Dorsal abdomen with narrow black stripe broadening slightly towards segment 10, becoming dark blue with age. .100 2909 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 19
  • Wings are clear with very small basal amber patch on hindwings. Ax veins dark.
  • Both sexes the last Ax vein is mostly incomplete.100 2899 Ax Vein Complete Navy Dropwing1 Lajuma 4 12 18 This may vary from specimen to specimen where one wing Ax vein may be complete100 2900 Trithemis furva Navy Dropwing Male Annotated Right Wing Ezemvelo GP RSA Nov 2019r 21 (probably the right wing)100 2915 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 30 100 2916 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 31 Pterostigmas brownish black, 3 mm.
  • Young male and female alike. 100 931 Trithemis furva Navy Dropwing Young Male Close up MP RSA Sep 2018r 3100 933 Trithemis furva Navy Dropwing Young Male Badplaas MP RSA Nov 2016r 3

Females:100 2884 Trithemis furva Navy Dropwing FemaleEzemvelo Nature Reserve LP RSA Dec 2018r 1

  • Yellowish with black markings.100 2913 Trithemis furva Navy Dropwing Female Old Close up Bobejaan NWP RSA Aug 2017r 8
  • Thorax has black zigzag line alongside.100 2917 Trithemis furva Navy Dropwing Female Old Close up Bobejaan NWP RSA Aug 2017r 10
  • Abdomen with narrow black stripe running along its top.100 2923 Trithemis furva Navy Dropwing Female Old Close up Bobejaan NWP RSA Aug 2017r 32
  • Wings each slightly smoky around nodus and tip, Hindwings with small basal splash.100 2925 Trithemis furva Navy Dropwing Female Old Close up Bobejaan NWP RSA Aug 2017r 40
  • Pterostigmas yellowish brown, becoming dark brown with age.100 2925 Trithemis furva Navy Dropwing Female Old Close up Bobejaan NWP RSA Aug 2017r 40
Habitat:
  • Mostly streams, but also rivers, in open landscapes and open areas in forest. Often with emergent vegetation and rocks. 
  • From 0 to 2500 m above sea level, but mostly below 2000.
Behaviour:
  • Mostly perches on rocks, where it looks almost blackish, or on twigs and reeds at water's edge.
  • Female usually away from the water, among tall grass or small bushes.
Compared with other species:
  • The Navy Dropwing, T. Furva Trithemis furva Navy Dropwing Male Nwanedi LP RSA Dec 2015 and the Highlands Dropwing, Trithemis dorsalis, Trithemis dorsalis Highlands Dropwing Male Kloofzight GP RSA Oct 2016 is virtually indistinguishable in the field.
  • T. Furva Trithemis furva Navy Dropwing Male Nwanedi LP RSA Dec 2015 Ax veins are dark .Trithemis dorsalis, Trithemis dorsalis Highlands Dropwing Male Kloofzight GP RSA Oct 2016 Ax veins yellow/cream bur may darken with age 
  • A guide however, is firstly the habitat, being usually rocky rivers at low elevations. Secondly pterostigmas that are usually all brownish black, with no white end-veins, and thirdly, a female which has a single zig-zaggy thoracic side stripe.
  • Also, the blue of the male is not so colourful and more blackish than in T. dorsalis.
  • It is essential to examine secondary genitalia, with scythe-like hamules and bristle tuft on anterior lamina.
    Link to similar species
    Trithemis donaldsoni (Denim Dropwing)
        Trithemis dorsalis (Highland Dropwing)

Learn More about other Dropwings, (Trithemis) Species

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Distribution

 Trithemis furva Navy Dropwing Distribution Map May 2020Distribution Map
South Africa

Political Map South Africa Political Map
South Africa

Topographical Map South Africa Topographical Map South Africa

Trithemis furva Navy Dropwing Distribution Map Africa May 2023 Distribution Map Africa

Political Map AfricaPolitical Map
Africa

Topographical Map AfricaPhysical Map
Africa 

  South Africa:

  •  Most of South Africa but with insufficient records for the Dry central parts.

Africa:

  • Angola; Botswana; Cameroon; Chad; Democratic Republic of the Congo; Equatorial Guinea; Eritrea; Ethiopia; Kenya; Lesotho; Malawi; Mozambique; Namibia; Nigeria; Republic of South Africa; Somalia; Sudan; Swaziland; Tanzania; Uganda; Zambia; Zimbabwe
Further reading:

Websites:

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