Elegant Dropwing (Trithemis werneri)

View the above photo record (by Eugene Troskie) in OdonataMAP here.

Find the Elegant Dropwing in the FBIS database (Freshwater Biodiversity Information System) here.

Family Libellulidae

Trithemis werneri ELEGANT DROPWING

Identification

Small size

Length up to 40mm; Wingspan attains 66mm.

Males are readily identified by their orange colouration with black markings, and large amber hindwing patch.

Females are less distinctive and are most similar to Trithemis annulata (Violet Dropwing) and Trithemis pluvialis (Russet Dropwing). They can be identified based on abdomen and thorax patterns, and amber patches at the base of the hind wings. Some females also have small amber patches in the outer wings.

Click here for more details on identification.

Trithemis werneri – Male
Ndumo Game Reserve, KwaZulu-Natal
Photo by Ryan Tippett

Habitat

Its natural habitats are large tropical and subtropical rivers in hot savanna regions. It inhabits well wooded areas with large trees along the upper banks. Frequently found along river sections with steep banks.

Habitat – Usutu River, Ndumo Game Reserve, KwaZulu-Natal
Photo by Ryan Tippett

Behaviour

Most often found perched on trees and large bushes away from the water and above the riverbanks. Individuals may be found more than 100m from the river. Both sexes occur in the same vicinity. Frequently perches high up in the outer canopy of riverine trees where it is inconspicuous. Skypoints from the tips of branches during the heat of the day. Seldom seen at the waters edge.

Status and Conservation

Trithemis werneri is uncommon and very localised in South Africa. This species is only known from undisturbed habitats and is not tolerant of habitat degradation. It is listed as of Least Concern in the IUCN Red List of Threatened Species. However, the South African population is considered Near Threatened due to its marginal occurrence and dependence on pristine habitats.

Distribution

The Elegant Dropwing is sparsely distributed and is found mostly in Eastern and Southern Africa. It occurs from southern Sudan down to extreme northern KwaZulu-Natal in South Africa. There are also outlying populations in Angola and north-western Namibia.

Below is a map showing the distribution of records in South Africa for Trithemis werneri. Taken from the OdonataMAP database as at February 2020.

The next map below is an imputed map, produced by an interpolation algorithm, which attempts to generate a full distribution map from the partial information in the map above. This map will be improved by the submission of records to the OdonataMAP section of the Virtual Museum.

Ultimately, we will produce a series of maps for all the odonata species in the region. The current algorithm is a new algorithm. The objective is mainly to produce “smoothed” maps that could go into a field guide for odonata. This basic version of the algorithm (as mapped above) does not make use of “explanatory variables” (e.g. altitude, terrain roughness, presence of freshwater — we will be producing maps that take these variables into account soon). Currently, it only makes use of the OdonataMAP records for the species being mapped, as well as all the other records of all other species. The basic maps are “optimistic” and will generally show ranges to be larger than what they probably are.

These maps use the data in the OdonataMAP section of the Virtual Museum, and also the database assembled by the previous JRS funded project, which was led by Professor Michael Samways and Dr KD Dijkstra.

Dragonfly Atlas: Megan Loftie-Eaton, Sally Hofmeyr, Ryan Tippett & Les Underhill
Dragonfly Atlas: Megan Loftie-Eaton, Sally Hofmeyr, Ryan Tippett & Les Underhill
Megan Loftie-Eaton is our communications, social media and citizen science coordinator. Prior to her work for the BDI, she coordinated OdonataMAP, the Atlas of African Odonata. Sally Hofmeyr has many years' experience in the academic world, writing her own material and editing the work of others. Her academic background is in the natural sciences: her PhD and first postdoc in ornithology and environmental change (Animal Demography Unit, University of Cape Town). Ryan Tippett is an enthusiastic contributor to Citizen Science and has added many important and interesting records of fauna and flora. He has been a member of the VMU since 2014 and has currently submitted over 11000 records. He is also on the expert identification panel for the Odonata Map project. Prof Les Underhill has been Director of the Animal Demography Unit (ADU) at the University of Cape Town since it started in 1991. Although citizen science in biology is Les’s passion, his academic background is in mathematical statistics.