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Butterfly

 

Butterfly

Butterflies
Temporal range: Eocene-Recent, 45–0Ma
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Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Suborder: Rhopalocera
Subgroups

Butterflies are part of the Class (biology) of Insects in the order Lepidoptera. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. The group comprises the true butterflies (superfamily Papilionoidea), the skippers (superfamily Hesperioidea) and the moth-butterflies (superfamily Hedyloidea). Butterfly fossils date to the mid Eocene epoch, 40–50 million years ago.[1]

Butterflies exhibit

  • Lamas, Gerardo (1990). "An Annotated List of Lepidopterological Journals" (PDF). Journal of Research on the Lepidoptera 29 (1-2): 92–104. 

Literature

  • BugGuide.net Many images of North American butterflies, many licensed via Creative Commons
  • Butterfly Pictures and Information
  • Butterfly of Brazil
  • Reference quality large format photographs, common butterflies of North America
  • Gallery of Florida Butterflies and Moths
  • Butterfly Picture Gallery
  • Photographs of most of the Butterflies in Southern California
  • Butterflies of Southern Illinois
  • Butterflies of France
  • Butterflies of Spain and Portugal
  • Butterfly Movies (Tree of Life)
  • 1000+ photos of Massachusetts butterflies
  • European butterfly pictures - common names and wildlife photography
  • Online videos of Skippers of the Northeast-USA
  • Butterflies Monitoring & Photography Society of Turkey

Images and movies

  • Collodi Butterfly House Tuscany
  • Butterflies and Moths of North America
  • Butterflies of America
  • Africa
  • Butterflies of Canada
  • North American Butterfly Association (NABA)
  • Butterflies and Moths in the Netherlands
  • Butterflies of Spain and Portugal
  • Insect and butterfly diversity of Pakistan
  • Butterflies of the Philippines
  • Butterflies of Southern India
  • Butterflies of Sri Lanka
  • Butterflies of Singapore
  • Israel Insect World
  • Singapore Butterfly Checklist
  • Butterfly Conservation Society of Taiwan
  • Butterflies of Morocco
  • Butterflies of Indo-China Chiefly Thailand, Laos and Vietnam.
  • Butterflies of Southeastern Sulawesi
  • Naturalis Butterflies of Sulawesi (Illustrated pdf)
  • Butterflies of Thailand
  • Butterflies of Mexico
  • Butterflies of Ghana
  • Butterflies of Turkey

Regional lists

  • Papilionoidea on the Tree of Life Web project
  • Butterflies on the UF / IFAS Featured Creatures Web site
  • Butterflies at Lepidoptera.pro: thousands of species and photos
  • International Field Guides database—a (more) comprehensive list of field guides

External links

  • Butterflies of North America, Jim P. Brock and Kenn Kaufman (2003)
  • Butterflies through Binoculars: The East, Jeffrey Glassberg (1999)
  • Butterflies through Binoculars: The West, Jeffrey Glassberg (2001)
  • Catalogue of the Butterflies of the United States and Canada Jonathan Pelham (2008)
  • Butterflies of British Columbia Crispin S. Guppy and Jon H. Shepard(2001)
  • Life Histories of Cascadia Butterflies David G. James and David Nunnallee(2011)
  • The Butterflies of Cascadia Robert Michael Pyle (2002)
  • A Field Guide to Eastern Butterflies, Paul Opler (1994)
  • A Field Guide to Western Butterflies, Paul Opler (1999)
  • Peterson First Guide to Butterflies and Moths, Paul Opler (1994)
  • Las Mariposas de Machu Picchu by Gerardo Lamas (2003)
  • The Millennium Atlas of Butterflies in Britain and Ireland by Jim Asher (Editor), et al.
  • Pocket Guide to the Butterflies of Great Britain and Ireland by Richard Lewington
  • Butterflies of Britain and Europe (Collins Wildlife Trust Guides) by Michael Chinery
  • Butterflies of Europe by Tom Tolman and Richard Lewington (2001)
  • Butterflies of Europe New Field Guide and Key by Tristan Lafranchis (2004)
  • Butterflies of Lebanon by Torben B. Larsen. Beirut. (1974)
  • The butterflies of Saudi Arabia and its neighbours. by Torben B. Laren (Stacey intl.) (1984)
  • The butterflies of Egypt by Torben B. Larsen (Apollo Books, Denmark). (1990)
  • Field Guide to Butterflies of South Africa by Steve Woodhall (2005)
  • The butterflies of Kenya and their natural history by Torben B. Larsen (OUP) (1991)
  • Butterflies of Sikkim Himalaya and their Natural History by Meena Haribal (1994).
  • Butterflies of Peninsular India by Krushnamegh Kunte, Universities Press (2005).
  • Butterflies of the Indian Region by Col M. A. Wynter-Blyth, Bombay Natural History Society, Mumbai, India (1957).
  • A Guide to Common Butterflies of Singapore by Steven Neo Say Hian (Singapore Science Centre)
  • Butterflies of West Malaysia and Singapore by W.A.Fleming. (Longman Malaysia)
  • The Butterflies of the Malay Peninsula by A.S. Corbet and H. M. Pendlebury. (The Malayan Nature Society)
  • Butterflies of West Africa (two vols.) by Torben B. Larsen. (Apollo Books, Denmark) (2005)
  • Oxford Butterflies of India by Thomas Gray, I.D.Kehimkar, J Punetha, Oxford University Press (2008)

Some field guides to butterfly species include:

Further reading

  • Boggs, C., Watt, W., Ehrlich, P. 2003. Butterflies: Evolution and Ecology Taking Flight. University of Chicago Press, Chicago, USA.
  • Darby, Gene, 1958. What Is A Butterfly. Chicago, Benefic Press. pp. 5–48.
  • Heppner, J. B. 1998. Classification of Lepidoptera. Holarctic Lepidoptera, Suppl. 1.
  • Monteiro, A., Pierce, N. E. (2001). "Phylogeny of Bicyclus (Lepidoptera : Nymphalidae) inferred from COI, COII, and EF-1 alpha gene sequences". Molecular Phylogenetics and Evolution 18 (2): 264–281.  
  • Nemos, F. ca. 1895. Europas bekannteste Schmetterlinge. Beschreibung der wichtigsten Arten und Anleitung zur Kenntnis und zum Sammeln der Schmetterlinge und Raupen Oestergaard Verlag, Berlin, (pdf 77MB)
  • Peña, C.; Waklberg, N.; Weingartner, E.; Kodandaramaiah, U.; Nylin, S.; Freitas, A. V. L.; Brower, A. V. Z. (2006). "Higher level phylogeny of Satyrinae butterflies (Lepidoptera: Nymphalidae) based on DNA sequence data". Molecular Phylogenetics and Evolution 40 (1): 29–49.  
  • Pyle, R. M. 1992. Handbook for Butterfly Watchers. Houghton Mifflin. First published, 1984. ISBN 0-395-61629-8
  • Stevens, M. (2005). "The role of eyespots as anti-predator mechanisms, principally demonstrated in the Lepidoptera". Biological Reviews 80 (4): 573–588.  

References

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  23. ^ Brakefield, Paul M.; Larsen, Torben B. (1984). "The evolutionary significance of dry and wet season forms in some tropical butterflies". Biological Journal of the Linnean Society 22: 1.  
  24. ^ Lyytinen, A.; Brakefield, P. M.; Lindström, L.; Mappes, J. (2004). "Does predation maintain eyespot plasticity in Bicyclus anynana". The Proceedings of the Royal Society B 271 (1536): 279–283.  
  25. ^ Brakefield, P. M.; Gates, J.; Keys, D.; Kesbeke, F.; Wijngaarden, P. J.; Monteiro, A.; French, V.; Carroll, S. B. (1996). "Development, plasticity and evolution of butterfly eyespot patterns". Nature 384 (6606): 236–242.  
  26. ^ Gilbert, L. E. (1972). butterflies"Heliconius"Pollen feeding and reproductive biology of . Proceedings of the National Academy of Sciences 69 (6): 1402–1407.  
  27. ^ Herrera, C. M. (1987). "Components of pollinator 'quality': comparative analysis of a diverse insect assemblage". Oikos (Oikos) 50 (1): 79–90.  
  28. ^  
  29. ^ Molleman, Freerk; Grunsven, Roy H. A.; Liefting, Maartje; Zwaan, BAS J.; Brakefield, Paul M. (2005). "Is male puddling behaviour of tropical butterflies targeted at sodium for nuptial gifts or activity?". Biol. J. Linn. Soc. 86 (3): 345–361.  
  30. ^ Colours take wing Frontline Magazine , pg 75, Oct 27–Nov 9, 1990
  31. ^ "Article on San Diego Zoo website". Sandiegozoo.org. Retrieved 2009-03-30. 
  32. ^ Obara, Y, Hidaki, T. (1968). "Recognition of the female by the male, on the basis of ultra-violet reflection, in the white cabbage butterfly Pieris rapae crucivora". Boisduval. Proc. Japan Acad. 44: 829–832. 
  33. ^ Hirota, Tadao; Yoshiomi, Yoshiomi (2004). (Lepidoptera: Pieridae)"Eurema hecabe"Color discrimination on orientation of female . Applied Entomology and Zoology 39 (2): 229–233.  
  34. ^ Kinoshita, Michiyo; Shimada, Naoko; Arikawa, Kentaro (1999). "Papilio xuthus"Color vision of the foraging swallowtail butterfly . The Journal of Experimental Biology 202 (2): 95–102.  
  35. ^ Swihart, S. L (1967). "Hearing in butterflies".  
  36. ^ Reppert, Steven M.; Zhu, Haisun; White, Richard H. (2004). "Polarized light helps monarch butterflies navigate". Current biology 14 (2): 155–158.  
  37. ^ Ellers, J., Boggs, Carol L. (2002). butterflies: Heritability, Sex Linkage, and population divergence"Colias"The evolution of wing color in . Evolution 56 (4): 836–840.  
  38. ^ Srygley, R. B., Thomas, A. L. R. (2002). "Aerodynamics of insect flight: flow visualisations with free flying butterflies reveal a variety of unconventional lift-generating mechanisms" (PDF). Nature 420 (6916): 660–664.  
  39. ^ Chill turns monarchs north; Cold weather flips butterflies’ migratory path March 23, 2013; Vol.183 #6 Science News
  40. ^ Pyle, Robert Michael. National Audubon Society Field Guide to North American Butterflies. pp. 712-713, Alfred A. Knopf, New York, ISBN 0-394-51914-0
  41. ^ Williams, C. B. (1927). "A study of butterfly migration in south India and Ceylon, based largely on records by Messrs. G Evershed, E.E.Green, J.C.F. Fryer and W. Ormiston". Trans. Ent. Soc. London 75: 1–33. 
  42. ^ Urquhart, F. A., Urquhart, N. R. (1977). "Overwintering areas and migratory routes of the Monarch butterfly (Danaus p. plexippus, Lepidoptera: Danaidae) in North America, with special reference to the western population". Can. Ent. 109 (12): 1583–1589.  
  43. ^ Wassenaar, L.I., Hobson, K.A. (1998). "Natal origins of migratory monarch butterflies at wintering colonies in Mexico: new isotopic evidence". Proc. Natl. Acad. Sci. U.S.A. 95 (26): 15436–9.  
  44. ^ Sauman, Ivo, Briscoe, Adriana D., Zhu, Haisun, Shi, Dingding, Froy, Oren, Stalleicken, Julia, Yuan, Quan, Casselman, Amy, Reppert, Steven M. et al. (2005). "Connecting the Navigational Clock to Sun Compass Input in Monarch Butterfly Brain". Neuron 46 (3): 457–467.  
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  46. ^ Dennis, R L H, Shreeve, Tim G., Arnold, Henry R., Roy, David B. (2005). "Does diet breadth control herbivorous insect distribution size? Life history and resource outlets for specialist butterflies". Journal of Insect Conservation 9 (3): 187–200.  
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  48. ^ Robbins, Robert K. (1981). "The "False Head" Hypothesis: Predation and Wing Pattern Variation of Lycaenid Butterflies". American Naturalist 118 (5): 770–775.  
  49. ^ Nafus, D. M. and I. H. Schreiner (1988) Parental care in a tropical nymphalid butterfly Hypolimas anomala. Anim. Behav. 36: 1425- 143
  50. ^ William E. Cooper, Jr. (1998) Conditions favoring anticipatory and reactive displays deflecting predatory attack. Behavioral Ecology
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  57. ^ Rabuzzi, M. 1997. Butterfly etymology. Cultural Entomology November 1997 Fourth issue online
  58. ^ Dorset Chronicle, May 1825, reprinted in: "The First Butterfly", in The Every-day Book and Table Book; or, Everlasting Calendar of Popular Amusements, Sports, Pastimes, Ceremonies, Manners, Customs, and Events, Each of the Three Hundred and Sixty-Five Days, in Past and Present Times; Forming a Complete History of the Year, Months, and Seasons, and a Perpetual Key to the Almanac, Including Accounts of the Weather, Rules for Health and Conduct, Remarkable and Important Anecdotes, Facts, and Notices, in Chronology, Antiquities, Topography, Biography, Natural History, Art, Science, and General Literature; Derived from the Most Authentic Sources, and Valuable Original Communication, with Poetical Elucidations, for Daily Use and Diversion. Vol III., ed. William Hone, (London: 1838) p 678.
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Notes

Lists

See also

Butterfly counts are organized to assess the numbers and species of butterflies in a given locale. Much of this work is organized and recorded by volunteers who share their information with researchers.

Citizen/Scientists

The discoloration and health of butterflies in butterfly farms, is now being studied for use as indicators of air quality in several cities.

The structural coloration of butterflies is inspiring nanotechnology research to produce paints that do not use toxic pigments and in the development of new display technologies.

Studies on the reflection and scattering of light by the scales on wings of swallowtail butterflies led to the innovation of more efficient light-emitting diodes.[60]

Technological inspiration

In the NBC television show Kings, butterflies are the national symbol of the fictional nation of Gilboa and a sign of God's favor.

The idiom "butterflies in the stomach" is used to describe a state of nervousness.

Some people say that when a butterfly lands on you it means good luck. However, in Devonshire, people would traditionally rush around to kill the first butterfly of the year that they see, or else face a year of bad luck.[58] Also, in the Philippines, a lingering black butterfly or moth in the house is taken to mean that someone in the family has died or will soon die.[59]

Der Schmetterlingsjäger (The butterfly hunter) by Carl Spitzweg (1840), a depiction from the era of butterfly collection.

In some old cultures, butterflies also symbolize rebirth after being inside a cocoon for a period of time.

In Chinese culture, two butterflies flying together symbolize love. Also, Butterfly Lovers is a famous Chinese folktale. The Taoist philosopher, Zhuangzi, once had a dream about being a butterfly that flew without care about humanity; however; when he awoke and realized that it was just a dream, he thought to himself, "Was I before a man who dreamt about being a butterfly, or am I now a butterfly who dreams about being a man?"

Butterfly and Chinese wisteriaflowers, by Xü Xi (c.886–c.975), painted around 970 during the early Song Dynasty.

According to Mircea Eliade's Encyclopedia of Religion, some of the Nagas of Manipur trace their ancestry from a butterfly.[57]

The ancient Greek word for "butterfly" is ψυχή (psȳchē), which primarily means "soul" or "mind".[56]

The Russian word for "butterfly", бабочка (bábochka), also means "bow tie". It is a diminutive of "baba" or "babka" (= "woman, grandmother, cake"), whence also "babushka" = "grandmother".

According to Kwaidan: Stories and Studies of Strange Things, by Lafcadio Hearn, a butterfly was seen in Japan as the personification of a person's soul; whether they be living, dying, or already dead. One Japanese superstition says that if a butterfly enters your guestroom and perches behind the bamboo screen, the person whom you most love is coming to see you. However, large numbers of butterflies are viewed as bad omens. When Taira no Masakado was secretly preparing for his famous revolt, there appeared in Kyoto so vast a swarm of butterflies that the people were frightened — thinking the apparition to be a portent of coming evil.[55]

Symbolism

Today, butterflies are widely used in various objects of art and jewelry: mounted in frames, embedded in resin, displayed in bottles, laminated in paper, and used in some mixed media artworks and furnishings.[54] Butterflies have also inspired the "butterfly fairy" as an art and fictional character, including in the Barbie Mariposa film.

A serving tray decorated with butterfly wings

In the ancient Mesoamerican city of Teotihuacan, the brilliantly colored image of the butterfly was carved into many temples, buildings, jewelry, and emblazoned on incense burners in particular. The butterfly was sometimes depicted with the maw of a jaguar and some species were considered to be the reincarnations of the souls of dead warriors. The close association of butterflies to fire and warfare persisted through to the Aztec civilization and evidence of similar jaguar-butterfly images has been found among the Zapotec, and Mayan civilizations.[53]

Artistic depictions of butterflies have been used in many cultures including Egyptian hieroglyphs 3500 years ago.[52]

Art

In culture

There are between 15,000 and 20,000 species of butterflies worldwide. Some well-known species from around the world include:

Rusty-tipped Page (Siproeta epaphus), Butterfly World (Florida)

Notable species

A butterfly's hind wings are thought to allow them to take swift, tight turns to evade predators.[51]

Eyespots and tails are found in many lycaenid butterflies. It is thought that their function is to divert the attention of predators from the more vital head region. An alternative theory is that these cause ambush predators such as spiders to approach from the wrong end and allow for early visual detection.[50]

Eyespots on wings of Speckled Wood, Pararge aegeria, appear to distract predators from attacking the head. The left hind wing has been badly damaged by birds, but the insect is alive and able to fly.

Behavioural defenses include perching and wing positions to avoid being conspicuous. Some female Nymphalid butterflies are known to guard their eggs from parasitoid wasps.[49]

Cryptic coloration is found in many butterflies. Some like the Oakleaf butterfly and Autumn Leaf are remarkable imitations of leaves.[48] As caterpillars, many defend themselves by freezing and appearing like sticks or branches. Some papilionid caterpillars resemble bird dropping in their early instars. Some caterpillars have hairs and bristly structures that provide protection while others are gregarious and form dense aggregations. Some species also form associations with ants and gain their protection (See Myrmecophile).

Chemical defenses are widespread and are mostly based on chemicals of plant origin. In many cases the plants themselves evolved these toxic substances as protection against herbivores. Butterflies have evolved mechanisms to sequester these plant toxins and use them instead in their own defense.[47] These defense mechanisms are effective only if they are also well advertised and this has led to the evolution of bright colours in unpalatable butterflies. This signal may be mimicked by other butterflies. These mimetic forms are usually restricted to the females.

Butterflies are threatened in their early stages by parasitoids and in all stages by predators, diseases and environmental factors. They protect themselves by a variety of means.

See also Defense in insects
Wings of a butterfly (Leopard Lacewing Cethosia cyane) become increasingly damaged as they age, and do not repair

Defense

It is suggested that most migratory butterflies are those that belong to semi-arid areas where breeding seasons are short.[45] The life-histories of their host plants also influence the strategies of the butterflies.[46]

Butterflies have been shown to navigate using time compensated sun compasses. They can see polarized light and therefore orient even in cloudy conditions. The polarized light in the region close to the ultraviolet spectrum is suggested to be particularly important.[44]

Other well known migratory species include the Painted Lady and several of the Danaine butterflies. Spectacular and large scale migrations associated with the Monsoons are seen in peninsular India.[41] Migrations have been studied in more recent times using wing tags and also using stable hydrogen isotopes.[42][43]

The eastern population of monarchs migrates hundreds to thousands of miles to overwintering sites in Mexico. There is a northward migration in the spring.[39][40]

Monarch Butterflies in Pacific Grove, California
Overwintering monarchs cluster on oyamel trees in a preserve outside of Angangueo, Michoacan, Mexico; one tree is completely covered in butterflies.
Monarch migration route
Many butterflies migrate over long distances.
See also Insect migration

Migration

Like many other members of the insect world, the lift generated by butterflies is more than what can be accounted for by steady-state, non-transitory aerodynamics. Studies using Vanessa atalanta in a windtunnel show that they use a wide variety of aerodynamic mechanisms to generate force. These include wake capture, vortices at the wing edge, rotational mechanisms and Weis-Fogh 'clap-and-fling' mechanisms. The butterflies were also able to change from one mode to another rapidly.[38]

See also Insect flight
Heteronympha merope taking off

Flight

Many species of butterfly maintain territories and actively chase other species or individuals that may stray into them. Some species will bask or perch on chosen perches. The flight styles of butterflies are often characteristic and some species have courtship flight displays. Basking is an activity which is more common in the cooler hours of the morning. Many species will orient themselves to gather heat from the sun. Some species have evolved dark wingbases to help in gathering more heat and this is especially evident in alpine forms.[37]

Many butterflies, such as the Monarch butterfly, are migratory and capable of long distance flights. They migrate during the day and use the sun to orient themselves. They also perceive polarized light and use it for orientation when the sun is hidden.[36]

Monarch butterflies

Some butterflies have organs of hearing and some species are also known to make stridulatory and clicking sounds.[35]

Vision is well developed in butterflies and most species are sensitive to the ultraviolet spectrum. Many species show sexual dimorphism in the patterns of UV reflective patches.[32] Color vision may be widespread but has been demonstrated in only a few species.[33][34]

Butterflies use their antennae to sense the air for wind and scents. The antennae come in various shapes and colours; the hesperids have a pointed angle or hook to the antennae, while most other families show knobbed antennae. The antennae are richly covered with sensory organs known as sensillae. A butterfly's sense of taste, 200 times stronger than humans,[30] is coordinated by chemoreceptors on the tarsi, or feet, which work only on contact, and are used to determine whether an egg-laying insect's offspring will be able to feed on a leaf before eggs are laid on it.[31] Many butterflies use chemical signals, pheromones, and specialized scent scales (androconia) and other structures (coremata or "hair pencils" in the Danaidae) are developed in some species.

Adult butterflies consume only liquids, ingested through the proboscis. They sip water from damp patches for hydration and feed on nectar from flowers, from which they obtain sugars for energy, and sodium and other minerals vital for reproduction. Several species of butterflies need more sodium than that provided by nectar and are attracted by sodium in salt; they sometimes land on people, attracted by the salt in human sweat. Some butterflies also visit dung, rotting fruit or carcasses to obtain minerals and nutrients. In many species, this mud-puddling behaviour is restricted to the males, and studies have suggested that the nutrients collected may be provided as a nuptial gift along with the spermatophore, during mating.[29]

Butterflies feed primarily on nectar from flowers. Some also derive nourishment from pollen,[26] tree sap, rotting fruit, dung, decaying flesh, and dissolved minerals in wet sand or dirt. Butterflies are important as pollinators for some species of plants although in general they do not carry as much pollen load as bees. They are however capable of moving pollen over greater distances.[27] Flower constancy has been observed for at least one species of butterfly.[28]

The Australian painted lady feeding on a flowering shrub
Antennal shape in the Lepidoptera from C. T. Bingham (1905)

Habits

Bicyclus anynana is a species of butterfly that exhibits a clear example of seasonal polyphenism. These butterflies, endemic to Africa, have two distinct phenotypic forms that alternate according to the season. The wet-season forms have large, very apparent ventral eyespots whereas the dry-season forms have very reduced, often nonexistent, ventral eyespots. Larvae that develop in hot, wet conditions develop into wet-season adults whereas those growing in the transition from the wet to the dry season, when the temperature is declining, develop into dry-season adults.[24] This polyphenism has an adaptive role in B. anynana. In the dry-season it is disadvantageous to have conspicuous eyespots because B. anynana blend in with the brown vegetation better without eyespots. By not developing eyespots in the dry-season they can more easily camouflage themselves in the brown brush. This minimizes the risk of visually mediated predation. In the wet-season, these brown butterflies cannot as easily rely on cryptic coloration for protection because the background vegetation is green. Thus, eyespots, which may function to decrease predation, are beneficial for B. anynana to express.[25]

[23] The dry-season forms are usually more cryptic and it has been suggested that the protection offered may be an adaptation. Some also show greater dark colours in the wet-season form which may have thermoregulatory advantages by increasing ability to absorb solar radiation.[22] Experimental modification by ecdysone hormone treatment has demonstrated that it is possible to control the continuum of expression of variation between the wet and dry-season forms.[21] and the seasonal forms of the butterflies are called the dry-season and wet-season forms. How the season affects the genetic expression of patterns is still a subject of research.seasonal polyphenismMany of the tropical butterflies have distinctive seasonal forms. This phenomenon is termed

Seasonal polyphenism

Wing markings called eyespots are present in some species; these may have an automimicry role for some species. In others, the function may be intraspecies communication, such as mate attraction. In several cases, however, the function of butterfly eyespots is not clear, and may be an evolutionary anomaly related to the relative elasticity of the genes that encode the spots.[19][20]

Batesian and Mullerian mimicry in butterflies is common. Batesian mimics imitate other species to enjoy the protection of an attribute they do not share, aposematism in this case. The Common Mormon of India has female morphs which imitate the unpalatable red-bodied swallowtails, the Common Rose and the Crimson Rose. Mullerian mimicry occurs when aposematic species evolve to resemble each other, presumably to reduce predator sampling rates, the Heliconius butterflies from the Americas being a good example.

The Heliconius butterflies from the tropics of the Western Hemisphere are the classical model for Müllerian mimicry.[18]

Mimicry

Genetic abnormalities such as gynandromorphy also occur from time to time. In addition many butterflies are infected by Wolbachia and infection by the bacteria can lead to the conversion of males into females[16] or the selective killing of males in the egg stage.[17]

Many adult butterflies exhibit polymorphism, showing differences in appearance. These variations include geographic variants and seasonal forms. In addition many species have females in multiple forms, often with mimetic forms. Sexual dimorphism in coloration and appearance is widespread in butterflies. In addition many species show sexual dimorphism in the patterns of ultraviolet reflectivity, while otherwise appearing identical to the unaided human eye. Most of the butterflies have a sex-determination system that is represented as ZW with females being the heterogametic sex (ZW) and males homogametic (ZZ).[15]

Polymorphism


Photographic and light microscopic images
Zoomed-out view of an Inachis io. Closeup of the scales of the same specimen. High magnification of the coloured scales (probably a different species).
Electron microscopic images
A patch of wing Scales close up A single scale Microstructure of a scale
Magnification Approx. ×50 Approx. ×200 ×1000 ×5000

Butterflies are characterized by their scale-covered wings. The coloration of butterfly wings is created by minute scales. These scales are pigmented with melanins that give them blacks and browns, but blues, greens, reds and iridescence are usually created not by pigments but the microstructure of the scales. This structural coloration is the result of coherent scattering of light by the scales.[12][13][14] The scales cling somewhat loosely to the wing and come off easily without harming the butterfly.

Scales

Adult butterflies have four wings: a forewing and hindwing on both the left and the right side of the body. The body is divided into three segments: the head, thorax, and the abdomen. They have two antennae, two compound eyes, and a proboscis.

External morphology

The adult, sexually mature, stage of the insect is known as the imago. As Lepidoptera, butterflies have four wings that are covered with tiny scales (see photo). The fore and hindwings are not hooked together, permitting a more graceful flight. An adult butterfly has six legs, but in the nymphalids, the first pair is reduced. After it emerges from its pupal stage, a butterfly cannot fly until the wings are unfolded. A newly emerged butterfly needs to spend some time inflating its wings with hemolymph and let them dry, during which time it is extremely vulnerable to predators. Some butterflies' wings may take up to three hours to dry while others take about one hour. Most butterflies and moths will excrete excess dye after hatching. This fluid may be white, red, orange, or in rare cases, blue.

Adult or imago

The pupal transformation into a butterfly through metamorphosis has held great appeal to mankind. To transform from the miniature wings visible on the outside of the pupa into large structures usable for flight, the pupal wings undergo rapid mitosis and absorb a great deal of nutrients. If one wing is surgically removed early on, the other three will grow to a larger size. In the pupa, the wing forms a structure that becomes compressed from top to bottom and pleated from proximal to distal ends as it grows, so that it can rapidly be unfolded to its full adult size. Several boundaries seen in the adult color pattern are marked by changes in the expression of particular transcription factors in the early pupa.

The larva transforms into a pupa (or chrysalis) by anchoring itself to a substrate and moulting for the last time. The chrysalis is usually incapable of movement, although some species can rapidly move the abdominal segments or produce sounds to scare potential predators.

When the larva is fully grown, hormones such as prothoracicotropic hormone (PTTH) are produced. At this point the larva stops feeding and begins "wandering" in the quest of a suitable pupation site, often the underside of a leaf.

Pupa

Near pupation, the wings are forced outside the epidermis under pressure from the hemolymph, and although they are initially quite flexible and fragile, by the time the pupa breaks free of the larval cuticle they have adhered tightly to the outer cuticle of the pupa (in obtect pupae). Within hours, the wings form a cuticle so hard and well-joined to the body that pupae can be picked up and handled without damage to the wings.

Wing disks are very small until the last larval instar, when they increase dramatically in size, are invaded by branching tracheae from the wing base that precede the formation of the wing veins, and begin to develop patterns associated with several landmarks of the wing.

Wings or wing pads are not visible on the outside of the larva, but when larvae are dissected, tiny developing wing disks can be found on the second and third thoracic segments, in place of the spiracles that are apparent on abdominal segments. Wing disks develop in association with a trachea that runs along the base of the wing, and are surrounded by a thin peripodial membrane, which is linked to the outer epidermis of the larva by a tiny duct.

Detail of a butterfly wing
Last instar wing disk, Junonia coenia

Wing development

Host plants often have toxic substances in them and caterpillars are able to sequester these substances and retain them into the adult stage. This makes them unpalatable to birds and other predators. Such unpalatibility is advertised using bright red, orange, black or white warning colours, a practice known as aposematism. The toxic chemicals in plants are often evolved specifically to prevent them from being eaten by insects. Insects in turn develop countermeasures or make use of these toxins for their own survival. This "arms race" has led to the coevolution of insects and their host plants.[11]

Some caterpillars have the ability to inflate parts of their head to appear snake-like. Many have false eye-spots to enhance this effect. Some caterpillars have special structures called osmeteria which are everted to produce foul-smelling chemicals. These are used in defense.

Butterfly caterpillars have three pairs of true legs from the thoracic segments and up to 6 pairs of prolegs arising from the abdominal segments. These prolegs have rings of tiny hooks called crochets that help them grip the substrate.[10]

Caterpillars mature through a series of stages called instars. Near the end of each instar, the larva undergoes a process called apolysis, in which the cuticle, a tough outer layer made of a mixture of chitin and specialized proteins, is released from the softer epidermis beneath, and the epidermis begins to form a new cuticle beneath. At the end of each instar, the larva moults the old cuticle, and the new cuticle expands, before rapidly hardening and developing pigment. Development of butterfly wing patterns begins by the last larval instar.

Some larvae, especially those of the Lycaenidae, form mutual associations with ants. They communicate with the ants using vibrations that are transmitted through the substrate as well as using chemical signals.[7][8] The ants provide some degree of protection to these larvae and they in turn gather honeydew secretions. Others such as Phengaris arion communicate with ants to form a parasitic relationship.[9]

Butterfly larvae, or caterpillars, consume plant leaves and spend practically all of their time in search of food. Although most caterpillars are herbivorous, a few species such as Spalgis epius and Liphyra brassolis are entomophagous (insect eating).

Caterpillars

The egg stage lasts a few weeks in most butterflies but eggs laid close to winter, especially in temperate regions, go through a diapause (resting) stage, and the hatching may take place only in spring. Other butterflies may lay their eggs in the spring and have them hatch in the summer. These butterflies are usually northern species, such as the Mourning Cloak (Camberwell Beauty) and the Large and Small Tortoiseshell butterflies.

Eggs are almost invariably laid on plants. Each species of butterfly has its own hostplant range and while some species of butterfly are restricted to just one species of plant, others use a range of plant species, often including members of a common family.

Butterfly eggs are fixed to a leaf with a special glue which hardens rapidly. As it hardens it contracts, deforming the shape of the egg. This glue is easily seen surrounding the base of every egg forming a meniscus. The nature of the glue is unknown and is a suitable subject for research. The same glue is produced by a pupa to secure the setae of the cremaster. This glue is so hard that the silk pad, to which the setae are glued, cannot be separated.

Butterfly eggs are protected by a hard-ridged outer layer of shell, called the chorion. This is lined with a thin coating of wax which prevents the egg from drying out before the larva has had time to fully develop. Each egg contains a number of tiny funnel-shaped openings at one end, called micropyles; the purpose of these holes is to allow sperm to enter and fertilize the egg. Butterfly and moth eggs vary greatly in size between species, but they are all either spherical or ovate.

Eggs

Butterflies may have one or more broods per year. The number of generations per year varies from temperate to tropical regions with tropical regions showing a trend towards multivoltinism.

Butterflies in their adult stage can live from a week to nearly a year depending on the species. Many species have long larval life stages while others can remain dormant in their pupal or egg stages and thereby survive winters.[6]

The face of a Dryas iulia, more commonly known as a Julia butterfly.
Mating Junonia coenia (Common Buckeye) butterflies

Life cycle

Donald Ringe writes that the name is derived from Middle English buterflie, butturflye, boterflye, from Old English butorflēoge, buttorflēoge, buterflēoge, perhaps a compound of butor (beater), mutation of bēatan (to beat), and flēoge (fly).[5]

The Oxford English Dictionary derives the word from a combination of butter and fly. It adds: "The reason of the name is unknown", and refers to Hensleigh Wedgwood, who "points out a Dutch synonym boterschijte in Kilian, which suggests that the insect was so called from the appearance of its excrement".[4]

Etymology

Contents

  • Etymology 1
  • Life cycle 2
    • Eggs 2.1
    • Caterpillars 2.2
      • Wing development 2.2.1
    • Pupa 2.3
    • Adult or imago 2.4
  • External morphology 3
    • Scales 3.1
  • Polymorphism 4
    • Mimicry 4.1
    • Seasonal polyphenism 4.2
  • Habits 5
  • Flight 6
    • Migration 6.1
  • Defense 7
  • Notable species 8
  • In culture 9
    • Art 9.1
    • Symbolism 9.2
    • Technological inspiration 9.3
    • Citizen/Scientists 9.4
  • See also 10
    • Lists 10.1
  • Notes 11
  • References 12
  • Further reading 13
  • External links 14
    • Regional lists 14.1
    • Images and movies 14.2
    • Literature 14.3
Butterfly flying around a flower

) eat harmful insects. Culturally, butterflies are a popular motif in the visual and literary arts. Harvesters of some plants, and caterpillars of a few butterflies (e.g., pollination Some species are pests because in their larval stages they can damage domestic crops or trees; however, some species are agents of [3] [2]

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