100 930 Trithemis furva Navy Dropwing Male Nwanedi LP RSA Dec 2015 1 r 2100 933 Trithemis furva Navy Dropwing Young Male Badplaas MP RSA Nov 2016r 3100 942 Trithemis furva Navy dropwing femal Broken wing Jan 2016 r 2 of 2

Navy Dropwing.   Blouvalvlerkie

Family Libellulidae Leach, 1815
More mages:

Trithemis furva Navy Dropwing Male Nwanedi LP RSA Dec 2015Images Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019Mature Male 100 2069 Trithemis furva Navy Dropwing Male Close up Mooinooi NWP RSA Nov 2016r 1Male 100 931 Trithemis furva Navy Dropwing Young Male Close up MP RSA Sep 2018r 3Young Male, 100 2890 Trithemis furva Navy Dropwing Young Male Lajuma Nature Reserve LP RSA Dec 2018r 2Young Male 1 Trithemis furva Navy Dropwing Female Old Close up Bobejaan NWP RSA Aug 2017Old Female Annotated Images of complete and incomplete Ax veins Ax Navy DropwingAx veins Ax

 




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Guides:
Short description: 

Medium sized and all dark blue with yellow facial markings.

Key identification features:

Male:

  • 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 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019  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 9 100 2906 Trithemis furva Navy Dropwing Male Close up1 Ezemvelo GP RSA Nov 2019r 11 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
  • 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) Pterostigmas brownish black, 3 mm.
  • Abdomen sides black below with yellow stripes when 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.
  • Young male and female alike.

Females:

  • Yellowish with black markings.
  • Thorax has black zigzag line alongside.
  • Abdomen with narrow black stripe running along its top.
  • Wings each slightly smoky around nodus and tip, hindwings with small basal splash.
  • Pterostigmas yellowish brown, becoming dark brown with age.
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)
Distribution and habitat:

http://vmus.adu.org.za/vm_map_afr.php?&database=odonata&grid=2&outline=1&key=0&map=4&spp=%20668890Most of South Africa but with insufficient records for the Dry central parts.
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.
Further reading:
Websites
Warwick Tarboton
A Visual Guide to the Damselflies and Dragonflies of South Africa
The IUCN Red List of Threatened Species  Least Concern
Odonata Atlas of Africa VMU Number 661790
Africa Dragonflies & Damselflies Online

 

 

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