Morpho (butterfly)
From Wikipedia, the free encyclopedia
| Morpho Butterfly | ||||||||||||||||||||
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 Menelaus Blue Morpho, Morpho menelaus
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| Diversity | ||||||||||||||||||||
| c.80 species | ||||||||||||||||||||
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| Papilio achilles Linnaeus, 1758 |
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M. absoloni |
A Morpho butterfly may be one of over 80 species of the genus Morpho. They are neotropical butterflies found mostly in South America as well as Mexico and Central America. Morphos range in wingspan from the 7.5 cm (3 inch) M. rhodopteron to the imposing 20 cm (8 inch) Sunset Morpho, M. hecuba. The name Morpho, meaning changed or modified, is also an epithet of Aphrodite and Venus.
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[edit] Physical description
Many Morpho butterflies are colored in metallic, shimmering shades of blue and green. These colors are not a result of pigmentation but are an example of iridescence: the extremely fine lamellated scales covering the Morpho's wings reflect incident light repeatedly at successive layers, leading to interference effects that depend on both wavelength and angle of incidence/observance. Thus the colors produced vary with viewing angle, however they are actually surprisingly uniform, perhaps due to the tetrahedral (diamond-like) structural arrangement of the scales or diffraction from overlying cell layers. This structure may be likened to a photonic crystal. The lamellate structure of their wing scales has been studied as a model in the development of fabrics, dye-free paints, and anti-counterfeit technology used in currency.
The iridescent lamellae are only present on the dorsal side of their wings, leaving the ventral side a drab brown.
The ventral side is decorated with ocelli or eyespots. In some species, such as M. godarti, the dorsal lamellae are so thin as to allow the ventral ocelli to peek through. While not all Morphos have iridescent coloration, they all have ocelli. In most species only the males are colorful, supporting the theory that the coloration is used for intrasexual communication between males. The lamellae reflect up to 70% of light falling on them, including any UV. The eyes of Morpho butterflies are thought to be highly sensitive to UV light and therefore the males are able to see each other from great distances. Some South American species are reportedly visible by the human eye up to one kilometre away.
There also exist a number of white Morpho species, principal among these being M. catenarius and M. laertes. An unusual species that is fundamentally white in coloration, but which exhibits a stunning purple iridescence when viewed at certain angles is the rare M. sulkowskyi, while among the metallic blue Morpho species, M. rhetenor stands out as the most iridescence of all, with M. cypris a close second. Indeed, M. cypris is notable in that specimens that are mounted in entomological collections will exhibit color differences across the wings if they are not 'set' perfectly flat.
[edit] Habitat
Morpho butterflies are forest dwellers but will venture into sunny clearings to warm themselves. Males are territorial and will chase any rivals. The peoples along the Rio Negro in Brazil once exploited the territorial habits of the Blue Morpho (M. menelaus) by luring them into clearings with bright blue decoys. The collected butterfly wings were used as embellishment for ceremonial masks.
Morpho butterflies feed on the juices of fermenting fruit with which they may also be lured. The inebriated butterflies wobble in flight and are easy to catch. Morphos will also feed on the bodily fluids of dead animals and on fungi. Therefore, Morpho butterflies may be important in dispersing fungal spores.
The entire life cycle of the Morpho butterfly, from egg to death, is approximately 137 days. The adults live for about a month. They have few predators as the adults are poisonous due to the feeding caterpillar sequestering poisonous compounds. The hairy brown caterpillars feed on a variety of leguminous plants. In some species the caterpillars are cannibalistic. If disturbed, some Morpho caterpillars will secrete a fluid smelling of rancid butter. The tufts of hair decorating the caterpillars have been recorded to irritate human skin.
The commoner (Blue) Morphos are reared en masse in commercial breeding programmes. The iridescent wings are used in the manufacture of jewellery and as inlay in woodworking. Papered specimens are sold with the abdomen removed to prevent its oily contents from staining the wings. Significant quantities of live specimens are exported as pupae from several neotropical countries for exhibition in butterfly houses.
[edit] References
- Eugène Le Moult with P.Real Les Morpho d'Amerique du Sud et Centrale. E. Le Moult, Paris : Editions scientifiques du Cabinet entomologique E. Le Moult. 1962-1963.
[edit] External links
- Morpho at funet.fi
- Butterflycorner.net
- Tree of Life
- Collecting trips to Amazonia
- Insectia.com: Morpho butterfly profile
- Quantified interference and diffraction in single Morpho butterfly scales
- Singapore Zoological Gardens' butterflies at the Zoo
- BBC Blue Sky: flights of fancy
- Stembol.com: Morpho butterflies
- Morphidae in online museum - including rare gynandomorph of Morphidae
- Pteron In Japanese but binomial names against the excellent photos.
