Lycaenidae | |
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The large blue, a lycaenid butterfly | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Lepidoptera |
Superfamily: | Papilionoidea |
Family: | Lycaenidae Leach, 1815 |
Subfamilies | |
and see text or List of lycaenid genera |
Lycaenidae is the second-largest family of butterflies (behind Nymphalidae, brush-footed butterflies), with over 6,000 species worldwide, [1] whose members are also called gossamer-winged butterflies. They constitute about 30% of the known butterfly species.
The family comprises seven subfamilies, including the blues (Polyommatinae), the coppers (Lycaeninae), the hairstreaks (Theclinae), and the harvesters (Miletinae).
Adults are small, under 5 cm usually, and brightly coloured, sometimes with a metallic gloss. Lycaenidae wings are generally blue or green. More than half of these butterflies depend on ants in some way. [2]
Larvae are often flattened rather than cylindrical, with glands that may produce secretions that attract and subdue ants. Their cuticles tend to be thickened. Some larvae are capable of producing vibrations and low sounds that are transmitted through the substrates they inhabit. They use these sounds to communicate with ants. [3] [4]
Adult individuals often have hairy antenna-like tails complete with black and white annulated (ringed) appearance. Many species also have a spot at the base of the tail and some turn around upon landing to confuse potential predators from recognizing the true head orientation. This causes predators to approach from the true head end resulting in early visual detection or to attack the false head ending up with a beak of dusty scales. [5]
Lycaenid caterpillars are diverse in their food habits and apart from phytophagy, some are entomophagous, feeding on aphids, scale insects, and ant larvae. Some lycaenids even exploit their association with ants by inducing ants to feed them by regurgitation, a process called trophallaxis. Not all lycaenid butterflies need ants, but about 75% of species associate with ants, [3] a relationship called myrmecophily. These associations can be mutualistic, parasitic, or predatory depending on the species.
In some species, larvae are attended and protected by ants while feeding on the host plant, and the ants receive sugar-rich honeydew from them, throughout the larval life, and in some species during the pupal stage. In other species, only the first few instars are spent on the plant, and the remainder of the larval lifespan is spent as a predator within the ant nest. It becomes a parasite, feeding on ant regurgitations, or a predator on the ant larvae. [3] The caterpillars pupate inside the ants' nest and the ants continue to look after the pupae. Just before the adults emerge, the wings of the butterfly inside the pupal case detach from it, and the pupa becomes silvery. The adult butterfly emerges from the pupa after three to four weeks, still inside the ant nest. The butterfly must crawl out of the ant nest before it can expand its wings.
Several evolutionary adaptations enable these associations, including small glands on the skin of the caterpillars called "pore cupola organs". Caterpillars of many species have a gland on the seventh abdominal segment that produces honeydew and is called the "dorsal nectary gland" (also called "Newcomer's gland"). An eversible organ called the "tentacular organ" is present on the eighth abdominal segment and this is cylindrical and topped with a ring of spikes and emits chemical signals which are believed to help in communicating with ants. [6]
Many taxonomists only include the Lycaeninae, Theclinae, Polyommatinae, Poritiinae, Miletinae, and Curetinae under the Lycaenidae. [7] [8] The Aphnaeinae, which used to be a tribe (Aphnaeini) within the Theclinae, were recently given subfamily rank too. [9]
Some older classifications used to include other subfamilies such as Liphyrinae (now Liphyrini, a tribe within Miletinae), Lipteninae (now Liptenini, a tribe within Poritiinae), or Riodininae (now a separate family: Riodinidae).
The fossil genus Lithodryas is usually (but not unequivocally) placed here; Lithopsyche is sometimes placed here, but sometimes in the Riodininae.
The great purple hairstreak, also called the great blue hairstreak, is a common gossamer-winged butterfly species in parts of the United States. It is actually a Neotropical species; its North American range only includes the warm-temperate and subtropical parts of that continent, and it ranges southwards almost to the Isthmus of Panama. The type specimen, however, was shipped to Europe from the Colony of Virginia, probably around the time of the United States Declaration of Independence.
Riodinidae is the family of metalmark butterflies. The common name "metalmarks" refers to the small, metallic-looking spots commonly found on their wings. The 1,532 species are placed in 146 genera. Although mostly Neotropical in distribution, the family is also represented both in the Nearctic, Palearctic, Australasian (Dicallaneura), Afrotropic, and Indomalayan realms.
Phengaris alcon, the Alcon blue or Alcon large blue, is a butterfly of the family Lycaenidae and is found in Europe and across the Palearctic to Siberia and Mongolia.
The gray hairstreak is also called the bean lycaenid or cotton square borer. It is a member of the Lycaenidae family, known as the gossamer-winged butterflies and the second-largest family of butterflies. It is one of the most common hairstreaks in North America, ranging over nearly the entire continent. It also occurs throughout Central America and in northern South America.
Lycaeninae, the coppers, are a subfamily of the gossamer-winged butterflies (Lycaenidae).
Miletinae is a subfamily of the family Lycaenidae of butterflies, commonly called harvesters and woolly legs, and virtually unique among butterflies in having predatory larvae. Miletinae are entirely aphytophagous. The ecology of the Miletinae is little understood, but adults and larvae live in association with ants, and most known species feed on Hemiptera, though some, like Liphyra, feed on the ants themselves. The butterflies, ants, and hemipterans, in some cases, seem to have complex symbiotic relationships benefiting all.
Polyommatini is a tribe of lycaenid butterflies in the subfamily of Polyommatinae. These were extensively studied by Russian novelist and lepidopterist Vladimir Nabokov.
Glaucopsyche, commonly called blues, is a Holarctic genus of butterfly in the family Lycaenidae, found mainly in Palearctic Asia. For other species called "blues" see subfamily Polyommatinae and genus Plebejus.
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.
The blue copper, also known as Lycaena heteronea, is an American butterfly that belongs to the gossamer-winged family. The butterfly is named so because of the bright blue hue of the upper side of the males' wings. Females are brown on their upper side. Both sexes are white with black spots on the underside of the wings. Blue coppers are seen on the west coast of the United States and the southwest region of Canada, particularly British Columbia and Alberta. The males are often confused with Boisduval’s blue, another species of butterfly. Blue coppers prefer to live in areas where species of Eriogonum are found. Blue copper larvae sometimes form mutualistic associations with Formica francoeuri, an ant species.
Singing caterpillars is a term coined by Philip James DeVries, referring to the fact that the larvae of ant-associated butterfly species of the families Riodinidae and Lycaenidae produce substrate borne sounds that attract ants. The study of these symbiotic associations was pioneered by Phil DeVries in Central America, and Naomi Pierce in Australia. Recently, Lucas Kaminski and collaborators are expanding the studies of riodinid-ant symbioses in Brazil.
Lycaena boldenarum, the boulder copper, is a species of butterfly which is endemic to New Zealand, it is found on both North Island and South Island in a wide variety of open habitats including grassland, shingle and sand dunes. They are normally only active in bright sunny conditions and their flight is usually low to the ground. The boldenarum part of the species name given by the Scottish entomologist Adam White in honour of his first wife, Helen and her sister Frances, whose maiden name was Bolden. It shares the Maori name pepe para riki with two congeners the common copper and the glade copper.
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.