(Old World Swallowtail)
|Subfamilies and genera|
There are 31 genera and about 600 species:
Swallowtail butterflies are large, colorful butterflies in the family Papilionidae, and include over 550 species. Though the majority are tropical, members of the family inhabit every continent except Antarctica. The family includes the largest butterflies in the world, the birdwing butterflies of the genus Ornithoptera.
Swallowtails have a number of distinctive features; for example, the Papilionid caterpillar bears a repugnatorial organ called the osmeterium on its prothorax. The osmeterium normally remains hidden, but when threatened, the larva turns it outward through a transverse dorsal groove by inflating it with blood.
The forked appearance of the swallowtails' hind wings, which can be seen when the butterfly is resting with its wings spread, gave rise to the common name swallowtail. As for its formal name, Linnaeus chose Papilio for the type genus, as Papilio is Latin for 'butterfly'. For the specific epithets of the genus, Linnaeus applied the names of Greek heroes to the swallowtails. The type species: Papilio machaon honoured Machaon, one of the sons of Asclepius, mentioned in the Iliad.
- 1 Distribution
- 2 Appearance/Morphology
- 3 Special adaptations and defense
- 4 Taxonomy
- 5 Mating and young
- 6 Food
- 7 Swallowtails and humans
- 8 In popular culture
- 9 References
- 10 Further reading
- 11 External links
As of 2005, 552 extant species have been identified, which are distributed across the tropical and temperate regions of all continents except Antarctica. Various species inhabit altitudes ranging from sea level to high mountains, as in the case of most species of Parnassius. The majority of swallowtail species and the greatest diversity in form and lifestyle are found in the tropics and subtropical regions between 20°N and 20°S,: particularly Southeast Asia, and between 20°N and 40°N in East Asia. Only 12 species are found in Europe and only one species, Papilio machaon is found in the British Isles. North America has 40 species, including several tropical species and Parnassius.
The northernmost swallowtail is the Arctic Apollo (Parnassius arcticus), found in the Arctic Circle in northeastern Yakutia, at altitudes of 1500 meters above sea level. In the Himalayas, various Apollo species such as Parnassius epaphus, have been found at altitudes of 6,000 meters above sea level.:221
Egg. "Dome-shaped, smooth or obscurely facetted, not as high as wide, somewhat leathery, opaque." (Doherty.)
Larva. Stout, smooth or with a series of fleshy tubercles on the dorsum : sometimes with a raised fleshy protuberance (the so-called hood or crest) on the fourth segment. The second segment has a transverse opening, out of which the larva protrudes at will and an erect, forked, glandular fleshy organ that emits a strong, penetrating, and somewhat pleasant odor.
Pupa. Variable in form but most often curved backwards. It is angulate, with the head truncate or rounded and the back of abdomen is smooth or tuberculate. It is attached by the tail, normally in a perpendicular position, and further secured by a silken girth round the middle. In Parnassius, the pupa is placed in a loose silken web between leaves.
Imago. Wings extraordinarily variable in shape. Hind wing very frequently has a tail, which may be slender, or broad and spatulate, but is always an extension of the termen at vein 4. In one genus, Armandia, the termen of the hind wing is prolonged into tails at the apices of veins 2 and 3 as well as at vein 4. Pore wing (except in the aberrant genera Parnassius and Hypermnestra) with all 12 veins present and in addition a short internal vein, vein 1 a, that invariably terminates on the dorsal margin.
Stages of development of a papilionid – Giant Swallowtail (Papilio cresphontes)
The key characteristics that differentiate the Papilionidae from the other butterfly families are:
- The presence of the osmeterium, a forked, fleshy eversible organ found in the prothoracic segment of papilionid caterpillars.
- Venation in the adult forewing of papilionids is characteristic. In swallowtails, the second anal vein, 2A, extends up to the wing margin and does not link with the first anal vein, 1A. These veins are fused in other butterfly families and 2A does not reach the wing margin.
- The sclerites of the cervix (membranous neck between the head and thorax) are fused beneath the neck where the muscles for head movement are anchored.
Papilio demodocus larva applying one horn of the evaginated osmeterium to an offending finger.
Papilio demodocus larva beginning to invaginate the osmeterium after the source of irritation is removed.
Adult forewing of Graphium agetes. Second anal vein, 2A, extends up to the wing margin and does not link with the first anal vein, 1A.
Special adaptations and defense
To defend against predators, swallowtail butterflies practice Batesian mimicry, a behavior in which the butterflies' appearance closely resemble that of distasteful species to ward off predators. Swallowtails differ from many animals that practice mimicry as certain species, such as the tiger swallowtail butterfly (Papilio glaucus), exhibit a female-limited polymorphism for Batesian mimicry and others, such as the Canadian tiger swallowtail (Papilio canadensis) do not display any form of mimicry.
Predators of the swallowtail butterfly include the Red-winged blackbird, Pennsylvania firefly, Five-lined skink, Green darner, Goldenrod spider, Chinese mantid, Fiery Searcher, and Striped Skunk.
Biological basis for polymorphisms in mimicry
In Papilio glaucus (Eastern Tiger swallowtail), Y-linkage determines whether the females are either wild-type (yellow and black) or melanic (dark melanin replaces the yellow background). This genetic difference stems from the fact that melanism is controlled by a single gene, which controls the level of dopamine in the organism. During development, the enzyme BAS, which assists dopamine in producing the yellow pigmentation, normally found on the wings' background, is suppressed. Without the pigmentation, the butterfly appears mostly black (the melanic form) and is a Batesian mimic of Battus philenor, the Pipevine swallowtail. There are also Papilio glaucus that are not wholly black; several possess an intermediate "sooty" color and are sensitive to temperature.
The different polymorphisms (wild-type, melanic, and the 'sooty' intermediate) depend upon the geographical distribution and abundance of its mimic, the Battus philenor, whose wing color varies depending on its geographical location. In order to be successfully confused for the B. philenor by predators, the Papilio glaucus's background wing color matches that of the B. philenor residing in the same regional area. Studies support this theory; in the southeastern United States, the relative abundance of melanic females has been found to geographically correlate with B. philenor.
Influence of sexual harassment in wing polymorphism
Only certain subsets of swallowtail females practice mimicry. This polymorphism is seen in Papilo dardanus, the African swallowtail butterfly, whose females have three different morphs for wing color pattern: a black-and-white pattern for Batesian mimicry, a black and yellow pattern that resembles the males of the species, and a pattern with orange patches that resembles the elderly males of the species. Given that the males of the species, which do not have Batesian mimicry, are preyed upon much more frequently by predators than the females, scientists initially questioned why females would choose an andromorph wing pattern, which would seemingly lower their fitness compared to the mimicry form.
Several hypotheses for this phenomena were made, the two noteworthy being the pseudosexual selection hypothesis and the male avoidance hypothesis. In the pseudosexual hypothesis, male butterflies aggressively approached the 'male' looking females and then mellowed their behavior into sexual behavior when they were close enough to identify them as females. In the male avoidance hypothesis, female butterflies disguise themselves in an attempt to evade male harassment, as courtship can be harmful, time-consuming, and attract predators.
One study recorded male responses to females of each morphs and found that the males consistently favored the Batesian mimics, then the black-and-yellow, and then the morph with orange patches. The scientists concluded that frequency-dependent selection did lead to equal success for all three alternative strategies: the Batesian females suffered the least number of predators but their fitness was reduced the most by sexual harassment, while the other two faced lower sexual harassment but also lost fitness from predators' attacks.
The genera of extant swallowtails are usually classified into three subfamilies, Baroniinae, Parnassiinae, and Papilioninae, the latter two being further divided into tribes. In swallowtails, besides morphological characteristics, the choice of foodplants and ecological lifestyle reflect phylogeny and classification.
The Baroniinae are a monotypic subfamily, restricted to a very small region in Mexico and are considered to be the most basal of the subfamilies. Baronia brevicornis is considered to be a relict species, and shares features with a fossil taxon Praepapilio. Baronia is unique amongst papilionids as having an Acacia species (family Leguminosae) as its foodplant.
The Parnassinae are a subfamily of essentially holarctic butterflies. The vast majority of species, mostly Parnassius, can be found in mountain habitats. Parnassinines can also be found in other habitats such as "arid deserts (Hypermnestra), humid forests (Luehdorfia) and even lowland meadows (Zerynthia)". The tribes recognized in the Parnassinae are Parnassiini, Zerynthiini, and Luehdorfiini.
Tribe Parnassiini contains two monotypic genera, Hypermnestra, largely confined to central Asia and the genus Parnassius (the Apollos), a distinctive group of many species, all of which are alpine and capable of living at high altitudes. Most Parnassius have two small reddish spots on their hindwings. The tribe Luehdorfiini contains the monotypic genera Archon of Asia minor and the genus Luehdorfia of China and Japan. These two tribes have evolved to change their foodplants, while the third tribe, Zerynthiini, has retained the archetypical papilionid foodplant, the lowland vine Aristolochia. Zerynthhini comprises four genera – Sericinus, Bhutanitis, Zerynthia and Allancastria.:13
Western Tiger Swallowtail
An additional subfamily, Praepapilioninae, consisting of a single genus Praepapilio, includes two species of extinct butterflies, each member being described from single fossils found in a middle Eocene deposit in Colorado, U.S.A. (Durden and Rose, 1978).
It is now accepted that the subfamily Papilioninae is monophyletic. The Swallowtail butterflies in the nominate tribe Papilionini number about 225 species and studies have been made on their host-plant coevolution and phylogeny. Old morphological classifications were also found to be valid in that they formed clusters. Species belonging to the groups that use Rutaceae as host plants formed two groups corresponding to Old World and American taxa. Those that fed on Lauraceae and Magnoliaceae were found to form another cluster which includes both Asian and American taxa.
The Parnassinae, like the Papilioninae, were also believed to be monophyletic based on morphological studies but recent studies based on both morphological and molecular characteristics suggest that this is not the case. Of the Parnassiinae, the genera Parnassius and Hypermnestra were found to be extremely close based on molecular studies and are now considered to be part of the tribe Parnassiini. The two taxa, Archon and Luehdorfia, have been found to be closely related through analysis of nuclear and mitochondrial DNA, and, though they share no morphological similarities, have now been united in the tribe Luehdorfiini.
The subfamily Baroniinae is represented by the sole representative species Baronia brevicornis. They are unique in the family to use the Fabaceae (Leguminosae) as their larval host plants. The Baronninae and the extinct subfamily Praepapilioninae share many external similarities and are traditionally considered to be the most primitive families and sister to the rest of the swallowtails. Recent research suggests that this may not be the case, the Baroniinae being closely related to only the Parnassiinae, and Praepapilio to only the Papilionini and neither taxa being sister to the rest of the swallowtails.
Mating and young
After mating, the male Parnassines produce a glue like substance that is used to seal the female genital opening and prevent other males from mating. They lay individual eggs on the underside of the leaves of their food plants. There is no parental investment once the eggs have been laid.
The pupae are typically attached to the substrate by the cremaster but with head up held by a silk girdle. The Apollos, however, pupate in debris on the ground and also build a loose cocoon. In the temperate regions, the winters are passed in a pupal diapause stage.
The caterpillars of various swallowtail butterfly species feed on a wide range of different plants, most depending on only one of five families: Aristolochiaceae, Annonaceae, Lauraceae, Umbelliferae (Apiaceae) and Rutaceae. By eating some of these toxic plants, the caterpillars sequester aristolochic acid which renders both the caterpillars and the butterflies of some of these as toxic, thus protecting them from predators. Swallowtail tribes Zerynthiini (Parnassiinae), Luehdorfiini (Parnassiinae) and Troidini (Papilioninae) almost exclusively use the Aristolochiaceae family as their host plants.
For example, the Eastern Black Swallowtail's main host plant in the wild is Queen Anne's Lace, but they also eat garden plants in the carrot family, including carrots, parsley, dill, and fennel.
Adult swallowtails sip nectar, but also mud and sometimes manure.
Swallowtails and humans
As swallowtail butterflies are large, colourful, and attractive, they were once targeteted by butterfly collectors. The largest of these, the Birdwing butterflies are particularly sought after and are cultured in butterfly farms for the purpose of collectors.
The Oregon Swallowtail is the state insect of Oregon. The Eastern Tiger Swallowtail is the state insect of Virginia and the state butterfly of Georgia, Delaware, and South Carolina. The Black Swallowtail is the state butterfly of Oklahoma.
In popular culture
Swallowtails have appeared in various forms of Japanese entertainment, such as tokusatsu, manga and anime. In the 1996 Season of the popular Japanese tokusatsu Metal Hero Series B-Fighter Kabuto and the 1997 American show Beetleborgs Metallix, one of the B-fighters/Astral Borgs motifs was a swallowtail hence her Japanese designated name "B-Fighter Ageha". In the manga and anime Bleach, Shinigami use Hell Butterflies to send messages and travel between Soul Society and the Living World (Earth); the same butterflies also guide souls during soul burials. These swallowtails are entirely black except for a few red markings on the wings, making them resemble Papilio protenor. The butterfly-based entity Beautifly from the Pokémon anime series is pictured as a swallowtail. Swallowtail butterflies also appear in the manga xxxHolic which resemble yuuko ichihara. The antagonist Koushaku Chono (Papillon) in the manga/anime Busou Renkin features swallowtail-like imagery.
The band Rudolf Steiner, later known as Schwarz Stein, recorded a song entitled 黒揚羽 (lit. Black Swallowtail) on an early demotape. It is a track on the 2006 collaboration album Another Cell. The band Elvenking recorded a song titled "Swallowtail", which was released on their 2006 album, The Winter Wake. Paramore's 2009 release "Brand New Eyes" features a dissected swallowtail butterfly on its cover.
In the Japanese video game Bayonetta the main character Bayonetta is a witch who is in a pact with a demoness who takes on a Swallowtail form
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|Wikimedia Commons has media related to Papilionidae.|
|Wikispecies has information related to: Papilionidae|
|Wikisource has the text of the 1905 New International Encyclopedia article Swallowtail.|
- "Papilionidae" on Tree of Life web project.
- Family Papilionidae at Lepidoptera.pro
- Revised GloBIS/GART Papilionidae species checklist.
- GloBIS Database Includes type images
- Natural History Museum, London web site on "Afrotropical Kite Swallowtails".
- Collins, N.M., Morris, M.G. (1985) Threatened Swallowtail Butterflies of the World. IUCN. ISBN 2-88032-603-6
- Photoset and description of lesser known species of Swallowtails
- Swallowtails Papilionidae of the World: a pictorial summary . Comprehensive.
- Butterflies and Moths of North America
- Butterflies of America