Mechanitis

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Mechanitis
Mechanitis polymnia casabranca 1.jpg
Mechanitis polymnia
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Nymphalidae
Tribe: Ithomiini
Genus: Mechanitis
Fabricius, 1807
Species

See text

Synonyms
  • NereisHübner, [1806]
  • Hymenitis[Illiger], 1807
  • EpimetesBillberg, 1820

Mechanitis is a genus of butterflies in the tribe Ithomiini, commonly known as tigerwings. They were named by Johan Christian Fabricius in 1807. They are in the brush-footed butterfly family, Nymphalidae. Members of the genus Mechanitis were named for the machine-like metallic appearance of the chrysalis in certain species such as the Mechanitis polymnia . The chrysalises have a reflective chitin coating with a metallic appearance.

Contents

Taxonomy

Mechanitis was described by Johan Christian Fabricius in 1807. [1] Members of the genus Mechanitis in the brush-footed butterfly family, Nymphalidae. [2] Mechanitis are in the Ithomiini tribe which includes other Neotropical species of butterflies. The classification of Mechanitis, when based entirely on appearance of wing pattern and color is inaccurate because of the incidence of polymorphic butterflies. When wing patterns are similar the accuracy in identifying butterfly species is improved with the use of ecological and mitochondrial DNA. [3]

Description

Mechanitis polymnia Chrysalis Mechanitis Polymnia Chrysalis.jpg
Mechanitis polymnia Chrysalis
Mechanitis lysimnia Caterpillar Lagarta Maria-Boba Adulta.jpg
Mechanitis lysimnia Caterpillar

Butterflies in the genus Mechanitis are abundant and they are unpalatable. [2] The mature Mechanitis butterflies in the genus have warning colors which are black, orange, and yellow. They also have tiger patterns on their wings. [4] The butterfly gets the name Mechanitis from the chrysalises of the genus, which have a machine-like quality. [5] They are thin and small bodied butterflies with rounded wings and long yellow antennae. [5] The size of the adult or imago Mechanitis butterfly is 65–75 mm. [6]

Life history

The species are primarily forest butterflies and they are found at sea level and as high as 3,000 feet (910 m) above sea level in rainforests and humid forests. [3] Female members of the genus Mechanitis lay their eggs in clusters on the small hairs found on the leaves of poisonous plants in the genus of solanum and in the family Apocynaceae. [7] When the elongated white eggs hatch, the larva – caterpillars – feed in groups on the foliage. [8] Some eggs clusters are also laid on food plants, which can result in them being destroyed by predators. [9] Up to three egg clusters can be found on one plant, but only one is found per leaf. [9] If a female Mechanitis is disturbed while laying the eggs on the upper side of a leaf, she flies away but returns to the same leaf to continue ovipositing. [9] The egg clusters of the Mechanitis isthmia can range between 30 and 60 eggs. [9] Those plants which are exposed to direct sunlight during most of the day are chosen for ovipositing. [10] Most egg clusters are to be found on leaves less than a meter above the surface. [9] After the eggs develop into larvae, the larvae begin to feed themselves from the leaf on which they were laid, and later move on to other leaves. [10] Feeding is performed in tight groups in intervals. [10] Sometimes one group rests, while another one feeds. [10]

Reflective chrysalis

The pupa – chrysalis – of the Mechanitis polymnia have a mirror-like metallic appearance. The polymnia chrysalises have a reflective coating which conceals the defenseless pupa by reflecting its surroundings to confuse predators. It is thought that predators see their own reflection in the chrysalis and then flee. [11] Another theory is that a reflective exterior does not reduce predation but it may assist the larva in regulating their body temperature while pupating. [12]

The metallic-looking coating of the chrysalis is made of chitin. [13] The substance is also found in coatings on other insects such as jewel beetles. Unlike the jewel beetles, which retain their chitin, the Mechanitis chrysalis loses the reflective coating in about a week. [11] The fragile coating which gives the chrysalis of the Mechanitis its golden sheen is caused by light reflecting on the transparent chitin. The coating is dense, and there are up to 25 transparent layers which lie in the yellow-orange spectrum; the human eye then perceives the coating as gold. The chrysalis begins as blue or greenish, and then appears "golden" or "silver" after about two to four days. [6] [7]

Mating

Biologists believe the chemical scent diffusion is influential in mating. [14] When a male butterfly chases another butterfly with a similar color pattern which is recognized as female, he hovers over it, fanning it from the front and back. [14] If the target is recognized as a male, the chasing butterfly usually returns to his original observational place. [14] If the female is receptive to the courting, they try to mate. If they are disturbed during mating, the female usually carries the male to another place to mate. [14] After mating, the butterflies separate again and fly their own ways. [14]

Distribution

Mechanitis are found in the rainforests of South America [11] and in Central America as far north as Mexico. [6] The genus is distributed throughout the humid forests from Mexico to southern Brazil, into Paraguay, and stretching to three of the Caribbean islands. They have also been found in the Andean region of Colombia. [3]

Species

Arranged alphabetically: [15] [16]

ImageCaterpillarScientific nameDistribution
Mechanitis lysimnia lysimnia 28567565.jpg Lagarta Maria-Boba.jpg Mechanitis lysimnia (Fabricius, 1793) – confused tigerwingsouthern Mexico to Uruguay
Mechanitis messenoides1.jpg Mechanitis mazaeus Hewitson, 1860 – Mazaeus tigerwingSouth America
Mechanitis menapis mantineus (Nymphalidae, Danainae, Ithomiini) (31791364080).jpg Mechanitis menapis Hewitson, [1856] – variable tigerwingSouth America
Mechanitis polymnia Oranzovy tygr.jpg Mechanitis polymnia (Linnaeus, 1758) – disturbed tigerwing, orange-spotted tiger clearwingfrom Mexico to the Amazon rainforest

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<span class="mw-page-title-main">Butterfly</span> Group of insects in the order Lepidoptera

Butterflies (Rhopalocera) are insects that have large, often brightly coloured wings, and a conspicuous, fluttering flight. The group comprises the superfamilies Hedyloidea and Papilionoidea. The oldest butterfly fossils have been dated to the Paleocene, about 56 million years ago, though they may have originated earlier.

<span class="mw-page-title-main">Danainae</span> Subfamily of butterfly family Nymphalidae

Danainae is a subfamily of the family Nymphalidae, the brush-footed butterflies. It includes the Daniadae, or milkweed butterflies, who lay their eggs on various milkweeds on which their larvae (caterpillars) feed, as well as the clearwing butterflies (Ithomiini), and the tellervini.

<span class="mw-page-title-main">Pupa</span> Life stage of some insects undergoing transformation

A pupa is the life stage of some insects undergoing transformation between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their life cycle, the stages thereof being egg, larva, pupa, and imago. The processes of entering and completing the pupal stage are controlled by the insect's hormones, especially juvenile hormone, prothoracicotropic hormone, and ecdysone. The act of becoming a pupa is called pupation, and the act of emerging from the pupal case is called eclosion or emergence.

<span class="mw-page-title-main">Gulf fritillary</span> Sole species in brush-footed butterfly genus Agraulis

The Gulf fritillary or passion butterfly is a bright orange butterfly in the subfamily Heliconiinae of the family Nymphalidae. That subfamily was formerly set apart as a separate family, the Heliconiidae. The Heliconiinae are "longwing butterflies", which have long, narrow wings compared to other butterflies.

<i>Papilio polyxenes</i> Species of insect

Papilio polyxenes, the (eastern) black swallowtail, American swallowtail or parsnip swallowtail, is a butterfly found throughout much of North America. An extremely similar-appearing species, Papilio joanae, occurs in the Ozark Mountains region, but it appears to be closely related to Papilio machaon, rather than P. polyxenes. The species is named after the figure in Greek mythology, Polyxena, who was the youngest daughter of King Priam of Troy. Its caterpillar is called the parsley worm because the caterpillar feeds on parsley.

<i>Dryas iulia</i> Sole species of brush-footed butterfly genus Dryas

Dryas iulia, commonly called the Julia butterfly, Julia heliconian, the flame, or flambeau, is a species of brush-footed butterfly. The sole representative of its genus Dryas, it is native from Brazil to southern Texas and Florida, and in summer can sometimes be found as far north as eastern Nebraska. Over 15 subspecies have been described.

<i>Hamearis lucina</i> Species of butterfly

Hamearis lucina, the Duke of Burgundy, the only member of the genus Hamearis, is a European butterfly in the family Riodinidae. For many years, it was known as the "Duke of Burgundy fritillary", because the adult's chequered pattern is strongly reminiscent of "true" fritillaries of the family Nymphalidae.

<i>Limenitis camilla</i> Species of butterfly

Limenitis camilla, the (Eurasian) white admiral, is a butterfly of the family Nymphalidae. It is found in woodland throughout southern Britain and much of Europe and the Palearctic, extending as far east as Japan.

<span class="mw-page-title-main">Sara longwing</span> Species of butterfly

The Sara longwing is a species of neotropical heliconiid butterfly found from Mexico to the Amazon Basin and southern Brazil. It is a colourful species: the dorsal wing surface is black with a large medial patch of metallic blue that is framed by two bands of white on the forewings. The ventral wing surface is a dull brown to black with muted bands and small red spots on the proximal margin; total wingspan is 55–60 mm.

<i>Acraea terpsicore</i> Species of butterfly

Acraea terpsicore, the tawny coster, is a small, 53–64 millimetres (2.1–2.5 in), leathery-winged butterfly common in grassland and scrub habitats. It belongs to the Nymphalidae or brush-footed butterfly family. It has a weak fluttery flight. It is avoided by most insect predators. This species and the yellow coster are the only two Indian representatives of the predominantly African tribe Acraeini. It is found in India, Sri Lanka, Maldives to Myanmar, Thailand, Laos, Cambodia, Vietnam, Bangladesh, Singapore, and recently Australia

<i>Polygonia interrogationis</i> Species of butterfly

Polygonia interrogationis, commonly called the question mark butterfly, is a North American nymphalid butterfly. It lives in wooded areas, city parks, generally in areas with a combination of trees and open space. The color and textured appearance of the underside of its wings combine to provide camouflage that resembles a dead leaf. The adult butterfly has a wingspan of 4.5–7.6 cm (1.8–3.0 in). Its flight period is from May to September. "The silver mark on the underside of the hindwing is broken into two parts, a curved line and a dot, creating a ?-shaped mark that gives the species its common name."

<i>Charaxes</i> Genus of brush-footed butterflies

The rajah and pasha butterflies, also known as emperors in Africa and Australia, make up the huge type genus of the brush-footed butterfly subfamily Charaxinae, or leafwing butterflies. They belong to the tribe Charaxini, which also includes the nawab butterflies (Polyura). Charaxes are tropical Old World butterflies, with by far the highest diversity in sub-Saharan Africa, a smaller number from South Asia to Melanesia and Australia, and a single species in Europe. They are generally strong flyers and very popular among butterfly collectors.

<span class="mw-page-title-main">Ithomiini</span> Tribe of butterflies in the subfamily Danainae

Ithomiini is a butterfly tribe in the nymphalid subfamily Danainae. It is sometimes referred to as the tribe of clearwing butterflies or glasswing butterflies. Some authors consider the group to be a subfamily (Ithomiinae). These butterflies are exclusively Neotropical, found in humid forests from sea level to 3000 m, from Mexico to Argentina. There are around 370 species in some 40–45 genera.

<i>Mechanitis polymnia</i> Species of butterfly

Mechanitis polymnia, the orange-spotted tiger clearwing or disturbed tigerwing, is a butterfly of the family Nymphalidae. It is found from Mexico to the Amazon rainforest. The wingspan is 65–75 mm (2.6–3.0 in). The larvae feed on Solanum species.

<i>Brenthis daphne</i> Species of butterfly

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<i>Asterocampa celtis</i> Species of butterfly

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<i>Methona confusa</i> Species of butterfly

Methona confusa is a species of clearwinged butterfly in the order Lepidoptera and in the family Nymphalidae. It can be found in some Central and South American countries in regions with forests and mountains.

<i>Mechanitis lysimnia</i> Species of butterfly

Mechanitis lysimnia, the confused tigerwing, sweet-oil tiger or lysimnia tigerwing, is a species of butterfly of the family Nymphalidae. It was described by Johan Christian Fabricius in 1793. It is found in Central and South America, from southern Mexico to Uruguay. The habitat consists of disturbed forests at altitudes up to 1,500 metres (4,900 ft).

<i>Methona themisto</i> Species of butterfly

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<i>Chrysina limbata</i> Species of beetle

Chrysina limbata is a species of scarab beetle found only in mid-altitude forests in Costa Rica and western Panama. It is in the genus Chrysina, in the subfamily Rutelinae. It is notable for its metallic reflective silver color.

References

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