Papilio glaucus

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Eastern tiger swallowtail
Pristine Eastern Tiger Swallowtail.jpg
Male
Eastern Tiger Swallowtail Papilio glaucus Wings 2908px.jpg
Female
Status TNC G5.svg
Secure  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Papilionidae
Genus: Papilio
Species:
P. glaucus
Binomial name
Papilio glaucus
Papilio glaucus range map.JPG
Synonyms
  • Pterourus glaucus
  • Papilio turnusLinnaeus [2]

Papilio glaucus, the eastern tiger swallowtail, is a species of butterfly native to eastern North America. It is one of the most familiar butterflies in the eastern United States, [3] ranging north to southern Ontario, Canada, [4] and is common in many different habitats. It flies from spring until fall, during which it produces two to three broods. Adults feed on the nectar of many species of flowers, mostly from those of the families Apocynaceae, Asteraceae, and Fabaceae. P. glaucus has a wingspan measuring 7.9 to 14 cm (3.1 to 5.5 in). The male is yellow with four black "tiger stripes" on each forewing. Females may be either yellow or black, making them dimorphic. The yellow morph is similar to the male, but with a conspicuous band of blue spots along the hindwing, while the dark morph is almost completely black.

The green eggs are laid singly on plants of the families Magnoliaceae and Rosaceae. Young caterpillars are brown and white; older ones are green with two black, yellow, and blue eyespots on the thorax. The caterpillar will turn brown prior to pupating. It will reach a length of 5.5 centimetres (2.2 in). The chrysalis varies from a whitish color to dark brown. Hibernation occurs in this stage in locations with cold winter months.

The eastern tiger swallowtail is the state butterfly of Alabama (as well as state mascot), [5] Delaware, Georgia, North Carolina and South Carolina, [6] and is the state insect of Virginia. [7]

Description

Dorsal and ventral sides. 1. dorsal male; 2. dorsal female; 3. dorsal female (dark morph); 4. ventral male; 5. ventral female; 6. ventral female (dark morph) Papilio glaucus adults, MM.jpg
Dorsal and ventral sides. 1. dorsal male; 2. dorsal female; 3. dorsal female (dark morph); 4. ventral male; 5. ventral female; 6. ventral female (dark morph)

The wingspan ranges from 7.9 to 14 cm (3.1 to 5.5 in) [8] with females being the larger sex. Southern individuals are larger than northern ones. [9] Males are yellow with four black "tiger stripes" on each forewing. The outer edge of the forewing is black with a row of yellow spots. The veins are marked with black. The postmedian area of the hindwing is black with yellow spots along the margin. The inner margin of the hindwing has small red and blue spots. The ventral forewing margin has a yellow bar that is broken into spots. This broken bar is present in both sexes, and is used to distinguish P. glaucus from its close relatives. [10]

Females are dimorphic. The yellow morph differs from the male in having a blue postmedian area on the dorsal hindwing. In the dark morph, the areas that are normally yellow are replaced with dark gray or black. The bluish postmedian area on the ventral hindwing has one row of orange spots. [11] A shadow of the "tiger stripes" can be seen on the underside of some dark females. [10]

P. glaucus is one of a few species of papilionids known to produce gynandromorphs. Most bilateral gynandromorphs are hybrids of P. glaucus and P. canadensis that are found along hybrid zones. Color mosaics are found in the central part of the species range. [12]

Taxonomy

The first known drawing of a North American butterfly was of an eastern tiger swallowtail. It was drawn by John White in 1587, [3] during Sir Walter Raleigh's third expedition to Virginia. [13] White named his drawing "Mamankanois" which is believed to be a Carolina Algonquian word for "butterfly". [14] This species was later described by Carl Linnaeus in his 10th edition of Systema Naturae in 1758. [15] Some taxonomists place P. glaucus, along with the other tiger swallowtails, in the genus Pterourus . [3]

The eastern tiger swallowtail was formerly considered a single species with a vast range into northern Canada and the eastern United States. [3] In 1991, the subspecies Papilio glaucus canadensis was elevated to species level, thus reducing the range of P. glaucus to south of Canada. [16] In 2002, another closely related species, P. appalachiensis , was described by H. Pavulaan and D. M. Wright from the southern Appalachian Mountains. [15] These two species can be separated from P. glaucus by size; P. canadensis is smaller and P. appalachiensis is larger. These two also have a solid yellow bar along the margin of the ventral forewing. [10] P. canadensis females are not dimorphic, and P. appalachiensis females are rarely black. [17]

Similar species for the dark P. glaucus female include the pipevine swallowtail ( Battus philenor ), the spicebush swallowtail ( Papilio troilus ), and the female black swallowtail ( Papilio polyxenes ). B. philenor differs from the dark morph P. glaucus by the row of light-colored spots on each wing margin. P. troilus is more greenish, and has two rows of orange spots on the ventral hindwing. P. polyxenes is smaller, and the ventral hindwing has two rows of yellow-orange spots. [10]

Distribution and habitat

Specimen on a flowering bush in Eastern Oklahoma Eastern tiger swallowtail on a bush in Oklahoma.jpg
Specimen on a flowering bush in Eastern Oklahoma

P. glaucus is found in the eastern United States from southern Vermont to Florida west to eastern Texas and the Great Plains. [3] It is common throughout its range, [11] although is rarer in southern Florida and absent from the Florida Keys. [3] In 1932, a single specimen was collected in County Wicklow, Ireland. It is believed to have been an accidental introduction from North America. [18]

P. glaucus can be found almost anywhere deciduous forests occur. Common habitats include woodlands, fields, rivers, creeks, roadsides, and gardens. It will stray into urban parks and city yards. [8] [19] [20] Because it has adapted to many different habitats and host plants, P. glaucus is a generalist, and is not considered threatened. [3] [13] Papilio glaucus is considered to be one of the most polyphagous of all swallowtail species. [21] This is likely due to genetic traits and differential detoxification abilities. [22] However, as compared to Papilio canadensis , at the northern overlap between the two species, P. glaucus survive very poorly through their first larval instar when settling on a quaking aspen (Populus tremeloides) tree and their survival rate under those conditions are approximately 15%, whereas P. canadensis thrives on this food plant. [21]

Adults are seen from spring to fall, although the exact date varies depending on the location. In the south, they are seen from February to November; in the north, they are seen from May to September. [3] [8] [19] P. glaucus produces two broods in the north and three in the south. The first broods yield the smallest adults. [3]

Behavior

Group of male eastern tiger swallowtails puddling, including a male eastern black swallowtail Swallowtail Group IMGP6353.jpg
Group of male eastern tiger swallowtails puddling, including a male eastern black swallowtail

Eastern tiger swallowtails are diurnal, and are usually solitary. Adults are known to fly high above the ground, usually seen above the tree canopy. [13] [23] Males seek females by patrolling habitats containing the larval host plants. During courtship, the male and female fly about each other prior to landing and mating. The male releases perfume-like pheromones during courtship to entice the female into mating. [3] [24]

Adults use a wide range of food sources, most preferring to nectar on sturdy plants with red or pink flowers. [3] [9] Many members of the families Apocynaceae, Asteraceae and Fabaceae are used as common nectar sources. [19] [20] Males participate in a behavior called puddling, in which they congregate on mud, damp gravel or puddles. They extract sodium ions and amino acids from these sources which aid in reproduction. [19] [25] Males that puddle are typically fresh, and puddle only for their first couple of days. Females will occasionally puddle, but do not form congregations. [25] Adults have also been seen feeding on dung, carrion, and urine. [19]

The eastern tiger swallowtail, Papilio glaucus, is probably the most polyphagous of all 560+ species of swallowtail butterflies in the world. [21]

Life cycle

The butterfly may have one or two generations in the north, while southern areas may have three. Time duration for various stages is as follows:

Egg

Egg Papilio glaucus egg.jpg
Egg

Females lay their eggs singly on the host plant leaves, [24] preferring to oviposit on host plants near nectar sources. [26] The egg is round and green, later turning yellowish green with reddish dots. [24] The size of the egg is large for a butterfly, being 0.8 millimeters (0.03 in) in height and 1.2 millimeters (0.05 in) in width. [27] It takes between 4 and 10 days to hatch. [28]

Caterpillar

Fifth instar caterpillar, shortly before pupating TigerSwallowtailCaterpillar.jpg
Fifth instar caterpillar, shortly before pupating

The caterpillar eats the leaves of the host plant. It will rest on a silk pad on a leaf, with the edges of the leaf folded over itself and held together with silk. [24] [29] [30] The first three instars are brown. A large white spot, known as a saddle, is found on the abdomen. After molting to the fourth instar, the caterpillar becomes green. The swollen thorax has two black, yellow, and blue eyespots. These eyespots are much smaller than those of the similar-looking spicebush swallowtail caterpillar. A yellow and black transverse stripe is present between the first and second abdominal segments. It is concealed between the folds of the segments when the caterpillar is at rest. [24] [29] The abdomen is spotted transversely with light blue. Before pupating, the caterpillar will turn dark brown. It will reach a length of 5.5 centimetres (2.2 in). The caterpillar of P. glaucus is impossible to distinguish from the caterpillars of P. canadensis and P. appalachiensis . [24] [29]

Chrysalis

A light colored chrysalis Papilio glaucus.JPG
A light colored chrysalis

The chrysalis measures 3.2 centimetres (1.3 in). [27] It hangs from a surface by a silk girdle around the thorax and a silk pad at the base. [24] The chrysalis varies in color, ranging from off white to dark brown. It is often spotted with green and dark brown. Lighter-colored chrysalids often have a dark lateral stripe along each side of the body. Two horn-like projections are present on the head; one is found on the thorax. P. glaucus chrysalids can be found in a variety of places, but are commonly found on tree trunks, fence posts, and in ground litter. [24] It hibernates in locations with cold winters. [3]

Host plants

Leaves of Liriodendron tulipifera, one of many host plants for P. glaucus Liriodendron tulipifera.jpg
Leaves of Liriodendron tulipifera, one of many host plants for P. glaucus

The caterpillar feeds on host plants of many different families. [3] Common host plants used are those of the families Magnoliaceae and Rosaceae, with species including tulip tree ( Liriodendron tulipifera ), sweet bay magnolia ( Magnolia virginiana ) and wild black cherry ( Prunus serotina ). [1] It also feeds on other members of the family Rosaceae, as well as members from the families Lauraceae, Oleaceae, Rutaceae, and Tilioideae. [8] [19] [27] Aspens (Populus sect. Populus), birches ( Betula ), and willows ( Salix ) have been recorded in older literature as host plants, but these are used by P. canadensis. [1] Host plants of P. glaucus include:

Defense against predators

Caterpillar with an everted osmeterium Osmeterium cropped.jpg
Caterpillar with an everted osmeterium

The first three instars of the caterpillar are bird dropping mimics, coloration that helps protect it from predators. In later instars, the eyespots on the thorax serve to deter birds. [30] Like all members of the family Papilionidae, the caterpillar of P. glaucus possesses an osmeterium, an orange, fleshy organ that emits foul-smelling terpenes to repel predators. Normally hidden, the osmeterium is located on the first segment of the thorax, and can be everted when the caterpillar feels threatened. [32] The combination of eyespots and osmeterium makes the caterpillar resemble a snake. [33]

Since adults are palatable, dark morph females use Batesian mimicry to protect themselves from vertebrate predators by mimicking the poisonous pipevine swallowtail. Dark morph females are more prevalent in the south, where B. philenor is more common. [10] [34]

See also

Related Research Articles

<i>Papilio</i> Genus of butterflies

Papilio is a genus in the swallowtail butterfly family, Papilionidae, as well as the only representative of the tribe Papilionini. The word papilio is Latin for butterfly.

<span class="mw-page-title-main">Swallowtail butterfly</span> Butterflies of family Papilionidae

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.

<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>Papilio troilus</i> Species of butterfly

Papilio troilus, the spicebush swallowtail or green-clouded butterfly, is a common black swallowtail butterfly found in North America. It has two subspecies, Papilio troilus troilus and Papilio troilus ilioneus, the latter found mainly in the Florida peninsula. The spicebush swallowtail derives its name from its most common host plant, the spicebush, members of the genus Lindera.

<i>Papilio rutulus</i> Species of butterfly

Papilio rutulus, the western tiger swallowtail, is a swallowtail butterfly belonging to the Papilionidae family. The species was first described by Hippolyte Lucas in 1852.

<i>Papilio zelicaon</i> Species of butterfly

Papilio zelicaon, the anise swallowtail, is a common swallowtail butterfly of western North America. Both the upper and lower sides of its wings are black, but the upper wing has a broad yellow stripe across it, giving the butterfly an overall yellow appearance. There are striking blue spots on the rear edge of the rear wing, and the characteristic tails of the swallowtails. Its wingspan is 52–80 mm. Its body is somewhat shorter than the rather similar western tiger swallowtail, with which its range overlaps; it also lacks the black stripes, converging toward the tail, of the latter. There is a somewhat darker subspecies, P. z. nitra, which is rare throughout the range, though somewhat more often found at lower elevations.

<i>Papilio multicaudata</i> Species of butterfly

Papilio multicaudata, the two-tailed swallowtail, is a species of the family Papilionidae found in western North America from British Columbia to Central America.

<i>Papilio demoleus</i> Species of butterfly

Papilio demoleus is a common and widespread swallowtail butterfly. The butterfly is also known as the lime butterfly, lemon butterfly, lime swallowtail, and chequered swallowtail. These common names refer to their host plants, which are usually citrus species such as the cultivated lime. Unlike most swallowtail butterflies, it does not have a prominent tail. When the adult stage is taken into consideration, the lime swallowtail is the shortest-lived butterfly, with male adults dying after four days and females after a week. The butterfly is native to Asia and Australia, and can be considered an invasive pest in other parts of the world. The butterfly has spread to Hispaniola island in the Western Hemisphere, and to Mahé, Seychelles.

<i>Papilio polytes</i> Species of butterfly

Papilio polytes, the common Mormon, is a common species of swallowtail butterfly widely distributed across Asia.

<i>Pachliopta aristolochiae</i> Species of butterfly

Pachliopta aristolochiae, the common rose, is a swallowtail butterfly belonging to the genus Pachliopta, the roses, or red-bodied swallowtails. It is a common butterfly which is extensively distributed across south and southeast Asia.

<i>Papilio protenor</i> Species of butterfly

Papilio protenor, the spangle, is a butterfly found in India belonging to the swallowtail family.

<i>Papilio cresphontes</i> Species of butterfly

The giant swallowtail is the largest butterfly in North America. It is abundant through many parts of eastern North America; populations from western North America and down into Panama are now considered to belong to a different species, Papilio rumiko. Though it is often valued in gardens for its striking appearance, its larval stage can be a serious pest to citrus farms, which has earned its caterpillars the names orange dog or orange puppy. The giant swallowtail caterpillars possess remarkable camouflage from predators by closely resembling bird droppings. They use this, along with their osmeteria, to defend against predators such as wasps, flies, and vertebrates.

<i>Papilio demodocus</i> Species of butterfly

Papilio demodocus, the citrus swallowtail or Christmas butterfly, is a swallowtail butterfly which commonly occurs over the entirety of sub-Saharan Africa, including Madagascar, besides the southern Arabian Peninsula. The caterpillars feed on various native plants of especially the family Rutaceae, but have also taken to the leaves of cultivated citrus trees.

<i>Papilio aegeus</i> Species of butterfly

Papilio aegeus, the orchard swallowtail butterfly or large citrus butterfly is a species of butterfly from the family Papilionidae, that is found in eastern Australia and Papua New Guinea.

<i>Papilio demolion</i> Species of butterfly

Papilio demolion, the banded swallowtail, is a species of swallowtail butterfly belonging to the family Papilionidae.

<i>Papilio homerus</i> Species of butterfly

Papilio homerus, commonly known as the Homerus swallowtail or Jamaican swallowtail, is the largest butterfly species in the Western Hemisphere. The species is endangered and faces a potentially bleak future. Only two small populations of the Homerus swallowtail remain in a fraction of their original environment. It is endemic to Jamaica where the butterfly simultaneously serves as an icon of national pride and a need for conservation efforts. Over the past half century, the Jamaican swallowtail has been featured on various postal stamps and the Jamaican $1000 bill. In the face of rapid habitat destruction from human disruption and illegal collecting, the Jamaican swallowtail is listed on the Threatened Swallowtail Butterflies of the World by the International Union for Conservation of Nature and is protected under international and national level legislation.

<i>Papilio appalachiensis</i> Species of butterfly

Papilio appalachiensis, the Appalachian tiger swallowtail, is a species of swallowtail butterfly found in eastern North America, particularly in the Appalachian Mountains. It is a hybrid of another two Papilio species, Papilio canadensis and Papilio glaucus, with which it shares many characteristics. The butterflies are normally yellow and contain black patterns in their wings. Their wingspans range from 86 to 115 mm. The caterpillars range in color from green and yellow to orange and are ornamented with black specks that give them the appearance of a bird dropping, which is useful for camouflage, or a large eye, a form of mimicry that is also efficient for protection. This species is univoltine. Females lay their eggs in May.

<i>Papilio canadensis</i> Species of butterfly

Papilio canadensis, the Canadian tiger swallowtail, is a species of butterfly in the family Papilionidae. It was once classified as a subspecies of Papilio glaucus.

<i>Papilio palamedes</i> Species of butterfly

Papilio palamedes, the Palamedes swallowtail or laurel swallowtail, is a North American butterfly in the family Papilionidae.

<i>Papilio rumiko</i> Species of butterfly

Papilio rumiko is a species of swallowtail butterfly. It is found from the south-western United States, through Mexico, El Salvador, Honduras, Costa Rica to Panama. The northernmost record is north-eastern Colorado.

References

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  2. ↑ "Papilio glaucus (Eastern Tiger Swallowtail)". zipcodezoo.com. Retrieved May 10, 2013.
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  5. ↑ "Alabama Official Mascot and Butterfly: Eastern Tiger Swallowtail", Official Symbols and Emblems of Alabama, Alabama Department of Archives and History, retrieved 2019-05-07
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  7. ↑ "Official State Insects". Netstate. NSTATE, LLC. 18 March 2010. Archived from the original on 3 March 2011. Retrieved 13 August 2010.
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  17. ↑ Pavulaan, Harry; Wright, David M. (1 December 2004). "Discovery of a black female form of Pterourus appalachiensis (Papilionidae: Papilioninae) and additional observations of the species in West Virginia" (PDF). The Taxonomic Report of the International Lepidoptera Survey. 6 (1): 1–10. Retrieved 3 January 2011.
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  22. ↑ Lindroth, R.L.; Scriber, I.M.; Hsia, M.T.S. (Winter 1991). "Differential responses of tiger swallowtail subspecies to secondary metabolites from tuliptree and quaking aspen". Oecologia. 70 (1): 13–19. doi:10.1007/BF00377106. PMID   28311282. S2CID   24635310. in Scriber (1991)
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  33. ↑ Zabarauskas, Paul (2010). "Other kinds of mimicry". Grolier Online. Scholastic. Retrieved 4 December 2010.
  34. ↑ Hall, Donald W.; Butler, Jerry F. (1998–2007). "Eastern Tiger Swallowtail". Featured Creatures. Retrieved 4 December 2010.

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