Erikssonia edgei

Last updated

Waterberg copper
Erikssonia edgei, bo Rankinspas, a.jpg
Male and female
Scientific classification
Kingdom:
Phylum:
Class:
Order:
Family:
Genus:
Species:
E. edgei
Binomial name
Erikssonia edgei
Gardiner & Terblanche, 2010
Erikssonia edgei, verspreiding.jpg
Range in Limpopo, South Africa

Erikssonia edgei, commonly known as the Waterberg copper, tilodi copper or Edge's acraea copper, is an obligate myrmecophylous lycaenid butterfly, [1] which is native to Limpopo, South Africa. The critically endangered butterfly occurs in high-altitude grasslands on sandy substrates, and has only been obtained from the type and one subsequent locality. The population at the type locality, a farm in the Waterberg, went extinct about 12 years after its 1980 discovery. [2] It was afforded species status in 2010, when no extant populations were known. The status of two populations, discovered in 2013 at a private nature reserve to the southeast, remains indeterminate.

Contents

Description and biology

The forewing length is 12.3-16.8 mm for males and 16.1–19.1 mm for females. It was found to be closely related to the Aloeides rough coppers (cf. A. dentatis and A. thyra ) [3] and like them, is associated with ground-nesting ants. The larvae feed on two species of Gnidia , both poisonous, and shelter by day in the nests of Lepisiota ants, wherein the pupae also develop.

Adults are on wing from November to April. They fly slowly and weakly in the vicinity of their host plants, and dive into the grass when disturbed. The males are territorial during the warmer hours of the day, but the females not. They like basking in the sun, and often feed on nectar, but not during the hours devoted to territorial behaviour or egg-laying. In cool cloudy weather they may be found resting on the sand between grass tufts. [3]

Egg-laying

A female that is ready to oviposit will investigate the surfaces of plants with her antennae. When she encounters the food plant she uses her antennae to search for traces of the trail pheromones of the host ant. Upon encountering this, she will walk down until she reaches the ground at the base of the plant. There she will oviposit the yellowish ochre eggs by curving her abdomen down to the ground surface. The eggs darken to greyish brown, and their appearance has been likened to a truffle. Their micro-structure is considered quite unique among lycaenid eggs. Ants carry the eggs into the nest where the larvae hatch in about 18 days, and congregate with the ant brood. [3]

Instars

The different larval instars are fairly uniform in appearance. They have pinkish grey bodies with a maroon line down the dorsum, flanked by bluish green and regular reddish brown markings on the sides. The head is dark with yellow markings, while the neck and anal shields are likewise dark, but with a broad, yellow median line. The well-developed honey-gland is located on the seventh segment, and retractile white tubercles with protective spines are located on the eighth segment. [3]

The larvae shelter during the day in the nest of the host ant, and emerge at night, sometimes simultaneously, to feed on the host plant. The first two instars feed on the leaf surfaces, while the third and fourth begin to consume the leaf margins. The larvae are much larger than the ants, which always accompany them. The ants may stroke them slowly with their antennae, and often feed at their honey-glands. Motionless larvae may extrude their tubercles to ward them off. The 5th and 6th instars feed only on leaf edges. The sixth and last instar takes about three weeks to grow to over 3 cm in length. It pupates inside the ant nest, but will only expand its wings once exposed to light. [3]

Aposematism

It is believed that the adult butterfly's black-spotted orange markings are a sign of unpalatability, and they may be toxic due to the larval stage's poisonous food plants. [2] It is suspected that they may form part of a mimicry ring with Telchinia serena .

Range and populations

It has only been found in Limpopo, South Africa, and was originally deemed to be a southern population of E. acraeina . No specimens were obtained in the years 1993 to 2012, and the southern population was feared extinct. As of 2017, it status is indeterminate as its continued presence at Bateleur Nature Reserve has not been confirmed.

Jan Trichardt's Pass

The first known population was located at 1,595 m.a.s.l. in a sparse mountain bushveld near Jan Trichardt's Pass in the central Waterberg. They frequented 3 ha at the northwestern base of Perdekop, a peak on the edge of an expansive, level valley. [3] It was discovered there on 21 December 1980 by Dr. Dave Edge, who was accompanied by his spouse Esmé. [4] This population was known to fly from December to early February. About 12 years later it was locally extinct, and no other populations were then known. Its local extinction was ascribed to habitat changes induced by altered grazing and fire management practices. [1] [5] The short grass and host plants were taken over by turpentine grass during a period when the conservation area suffered from poor administration. [6]

Bateleur Nature Reserve

On 2 March 2013, Prof. Mark Williams and his spouse Tildie discovered two new colonies in a 5 ha area of the private Bateleur Nature Reserve, some 42 km southeast of the type locality. They are situated at 1,550 and 1,580 m.a.s.l. respectively. This population was found to fly from November to April. Jeremy Dobson and Owen Garvie were assigned to implement a conservation plan for this new locality in the southeastern Waterberg. [7] Vegetation at the new locality is treeless grassland, with the hitherto known larval host-plant, Gnidia kraussiana , present but uncommon. Females were observed to lay their eggs at the base of Gnidia microcephala besides G. kraussiana, and the ant host appeared to be a Lepisiota species, as was the case at the type locality. [5] Following the severe 2015/2016 drought, the butterflies did not appear as expected in November 2016. [6]

Etymology

It is named after Dr. Dave Edge, who, together with Esmé Edge, [8] discovered the population in the Waterberg Mountains near Vaalwater and first realized this species to be distinct. Tilodi recalls Tlodi game farm where it was discovered, tlodi being the Pedi word for serval.

Related Research Articles

Ichneumonoidea

The superfamily Ichneumonoidea contains one extinct and three extant families, including the two largest families within Hymenoptera: Ichneumonidae and Braconidae. The group is thought to contain as many as 100,000 species, many of which have not yet been described. Like other parasitoid wasps, they were long placed in the "Parasitica", variously considered as an infraorder or an unranked clade, now known to be paraphyletic.

Large blue Species of butterfly

The large blue is a species of butterfly in the family Lycaenidae. The species was first defined in 1758 and first recorded in Britain in 1795. In 1979 the species became extinct in Britain but has been successfully reintroduced with new conservation methods. Currently large blue is classified as "near threatened" on the IUCN Red List of Threatened Species. Today P. arion can be found in Europe, the Caucasus, Armenia, western Siberia, Altai, north-western Kazakhstan and Sichuan.

<i>Pieris brassicae</i> Species of butterfly

Pieris brassicae, the large white, also called cabbage butterfly, cabbage white, cabbage moth (erroneously), or in India the large cabbage white, is a butterfly in the family Pieridae. It is a close relative of the small white, Pieris rapae.

Common blue species of butterfly

The common blue butterfly is a butterfly in the family Lycaenidae and subfamily Polyommatinae. The butterfly is found throughout the Palearctic. Butterflies in the Polyommatinae are collectively called blues, from the coloring of the wings. Common blue males usually have wings that are blue above with a black-brown border and a white fringe. The females are usually brown above with a blue dusting and orange spots.

Lycaenidae Family of butterflies

Lycaenidae is the second-largest family of butterflies, with over 6,000 species worldwide, whose members are also called gossamer-winged butterflies. They constitute about 30% of the known butterfly species.

<i>Polygonia c-album</i> Species of butterfly

Polygonia c-album, the comma, is a food generalist (polyphagous) butterfly species belonging to the family Nymphalidae. The angular notches on the edges of the forewings are characteristic of the genus Polygonia, which is why species in the genus are commonly referred to as anglewing butterflies. Comma butterflies can be identified by their prominent orange and dark brown/black dorsal wings.

Large copper Species of butterfly

The large copper is a butterfly of the family Lycaenidae. L. dispar has been commonly arranged into three subspecies: L. dispar dispar, (single-brooded) which was commonly found in England, but is now extinct, L. d. batavus, (single-brooded) can be found in the Netherlands and has been reintroduced into the United Kingdom, and lastly, L. d. rutilus, (double-brooded) which is widespread across central and southern Europe. The latter has been declining in many European countries, due to habitat loss. Currently L. dispar is in severe decline in northwest Europe, but expanding in central and northern Europe.

Marsh fritillary Species of butterfly

The marsh fritillary is a butterfly of the family Nymphalidae. Commonly distributed in the Palearctic region, the marsh fritillary's common name derives from one of its several habitats, marshland. The prolonged larval stage lasts for approximately seven to eight months and includes a period of hibernation over the winter. The larvae are dependent on the host food plant Succisa pratensis not only for feeding but also for hibernation, because silken webs are formed on the host plant as the gregarious larvae enter hibernation. Females lay eggs in batches on the host plant and are, like other batch-layers, selective about the location of oviposition because offspring survivorship levels for batch-layers are more tied to location selection than they are for single-egg layers.

Cabbage moth Species of moth

The cabbage moth is primarily known as a pest that is responsible for severe crop damage of a wide variety of plant species. The common name, cabbage moth, is a misnomer as the species feeds on many fruits, vegetables, and crops in the genus Brassica. Other notable host plants include tobacco, sunflower, and tomato, making this pest species particularly economically damaging.

<i>Agrotis ipsilon</i> Species of moth

Agrotis ipsilon, the dark sword-grass, black cutworm, greasy cutworm, floodplain cutworm or ipsilon dart, is a small noctuid moth found worldwide. The moth gets its scientific name from black markings on its forewings shaped like the letter "Y" or the Greek letter upsilon. The larvae are known as "cutworms" because they cut plants and other crops. The larvae are serious agricultural pests and feed on nearly all varieties of vegetables and many important grains.

<i>Phengaris rebeli</i> Species of butterfly

Phengaris rebeli, common name mountain Alcon blue, is a species of butterfly in the family Lycaenidae. It was first found and described in Styria, Austria, on Mount Hochschwab around 1700. Although it was initially classified as a subspecies of P. alcon, a European researcher, Lucien A. Berger, designated it as a separate species in 1946. Genetic similarities between P. rebeli and P. alcon have led many researchers to argue that the two are the same species and differences are due to intraspecific variation.

<i>Orachrysops niobe</i> Species of butterfly

Orachrysops niobe, the Brenton blue, is a species of butterfly in the family Lycaenidae and is endemic to South Africa.

<i>Epargyreus clarus</i> Species of butterfly

Epargyreus clarus, the silver-spotted skipper, is a butterfly of the family Hesperiidae. It is claimed to be the most recognized skipper in North America. E. clarus occurs in fields, gardens, and at forest edges and ranges from southern Canada throughout most of the United States to northern Mexico, but is absent in the Great Basin and western Texas.

<i>Jalmenus evagoras</i> Species of butterfly

Jalmenus evagoras, the imperial hairstreak, imperial blue, or common imperial blue, is a small, metallic blue butterfly of the family Lycaenidae. It is commonly found in eastern coastal regions of Australia. This species is notable for its unique mutualism with ants of the genus Iridomyrmex. The ants provide protection for juveniles and cues for adult mating behavior. They are compensated with food secreted from J. evagoras larvae. The ants greatly enhance the survival and reproductive success of the butterflies. J. evagoras lives and feeds on Acacia plants, so butterfly populations are localized to areas with preferred species of both host plants and ants.

<i>Lycaena feredayi</i> Species of butterfly

Lycaena feredayi, the glade copper, is a butterfly of the family Lycaenidae. It is endemic to New Zealand.

<i>Erikssonia cooksoni</i> Species of butterfly

Erikssonia cooksoni, the Cookson's copper, is a butterfly of the family Lycaenidae. The species was first described by Hamilton Herbert Druce in 1905. It is found in the Democratic Republic of the Congo (Lualaba) and north-western Zambia. It is found in sparse miombo woodland with low herbs.

<i>Gentiana cruciata</i>

Gentiana cruciata, the star gentian or cross gentian, is a herbaceous perennial flowering plant in the Gentianaceae family.

Madrone butterfly Species of butterfly

Eucheira socialis, commonly known as the Madrone butterfly is a lepidopteran that belongs to the family Pieridae. It was first described by Westwood in 1834. Locally known as Mariposa del madroño or tzauhquiocuilin, it is endemic to the highlands of Mexico, and exclusively relies on the Madrone as a host-plant. The species is of considerable interest to lepidopterists due to gregarious nest-building in the larval stages, and heavily male biased sex ratio. It takes an entire year for this adult butterfly to develop from an egg. The eggs are laid in the month of June and the adults emerge the following May–June. The adults have a black and white pattern on their wings, and the males are generally much smaller and paler than the females. The larvae do not undergo diapause and continue to feed and grow communally in the coldest months of the year. There are two subspecies of E. socialis, named E. socialis socialis and E. socialis westwoodi.

<i>Lycaena rubidus</i> Species of butterfly

Lycaena rubidus, the ruddy copper, is a butterfly of the family Lycaenidae. It is found in the western mountains of North America. Adults lay their eggs on plants of the genus Rumex, which later become the larval food plants. This butterfly gets its name from the brightly colored wings of the males, which are important in sexual selection. Its larvae exhibit mutualism with red ants, and are often raised in ant nests until they reach adulthood. Adults are on wing from mid-July to early August.

<i>Niphanda fusca</i> Species of butterfly

Niphanda fusca is a parasitic butterfly primarily found in East Asian countries such as Japan and Korea. It is a "cuckoo-type" parasite of the ant Camponotus japonicus. It utilizes chemical mimicry to trick the host worker ants into adopting it while it is a third-instar caterpillar. From there, it is fed mouth-to-mouth by the worker ants as though it were one of their own young.

References

  1. 1 2 New, Tim R. (2012). Insect conservation: past, present and prospects. Dordrecht: Springer. p. 287. ISBN   9789400729629.
  2. 1 2 "Erikssonia edgei (Waterberg Copper)". brentonbluetrust.co.za. Brenton Blue Trust. 2013. Retrieved 24 April 2017.
  3. 1 2 3 4 5 6 Williams, Mark C. (2015). "Genus Erikssonia Trimen, 1891". Butterflies and Skippers of the Afrotropical Region (PDF). metamorphosis.org.za (14 ed.). Retrieved 9 June 2016.
  4. Edge, D. A. (1982). "Rediscovery of a rare butterfly". Rostrum, Newsletter of the Entomological society of Southern Africa. 2 (2).
  5. 1 2 Underhill, Les. "The good news Threat Thursday: The "Critically Endangered" Waterberg Copper, thought to be extinct, rediscovered on 2 March 2013". adu.org.za. Animal Demography Unit. Retrieved 24 April 2017.
  6. 1 2 Smillie, Shaun (24 January 2017). "Nets out as scientists stalk elusive butterfly". timeslive.co.za. Times Live. Retrieved 24 April 2017.
  7. Press Release: Rare Butterfly thought to be extinct rediscovered on 2nd March 2013.
  8. Nel, Nikki (28 May 2010). "Butterfly specie is named after a NWU lecturer". News. North-west University. Retrieved 7 August 2013.