''Polygonia interrogationis'', commonly called the question mark butterfly, is a North American

nymphalid The Nymphalidae are the largest family of butterflies, with more than 6,000 species distributed throughout most of the world. Belonging to the superfamily Papilionoidea, they are usually medium-sized to large butterflies. Most species have ...

butterfly Butterflies are winged insects from the lepidopteran superfamily Papilionoidea, characterized by large, often brightly coloured wings that often fold together when at rest, and a conspicuous, fluttering flight. The oldest butterfly fossi ...

. 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 Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see, or by disguising them as something else. Examples include the leopard's spotted coat, the b ...

that resembles a dead leaf. The adult butterfly has a wingspan of . 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."

Lifecycle

Like other species in the order of

Lepidoptera Lepidoptera ( ) or lepidopterans is an order (biology), order of winged insects which includes butterflies and moths. About 180,000 species of the Lepidoptera have been described, representing 10% of the total described species of living organ ...

, the question mark is a

holometabolous Holometabolism, also called complete metamorphosis, is a form of insect development which includes four life stages: egg, larva, pupa, and imago (or adult). Holometabolism is a synapomorphic trait of all insects in the clade Holometabola. Immatur ...

insect that undergoes four life stages. These four life stages are

embryo An embryo ( ) is the initial stage of development for a multicellular organism. In organisms that reproduce sexually, embryonic development is the part of the life cycle that begins just after fertilization of the female egg cell by the male sp ...

(egg),

larva A larva (; : larvae ) is a distinct juvenile form many animals undergo before metamorphosis into their next life stage. Animals with indirect development such as insects, some arachnids, amphibians, or cnidarians typically have a larval phase ...

(in this case,

caterpillar Caterpillars ( ) are the larval stage of members of the order Lepidoptera (the insect order comprising butterflies and moths). As with most common names, the application of the word is arbitrary, since the larvae of sawflies (suborder ...

pupa A pupa (; : pupae) 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 th ...

(chrysalis), and

imago In biology, the imago (Latin for "image") is the last stage an insect attains during its metamorphosis, its process of growth and development; it is also called the ''imaginal'' stage ("imaginal" being "imago" in adjective form), the stage in wh ...

(or adult/butterfly).

Eggs

After the male has found the female perching on a tree or in the grass, courting ensues, after which the mating of the two occurs. Females lay eggs singly or stacked under leaves of plants that are usually not the hosts. The young hatchlings must then find their food source to survive.

Larvae

Larvae of the question mark butterfly, like all lepidopteran larvae, mature through a series of stages called

instar An instar (, from the Latin '' īnstar'' 'form, likeness') is a developmental stage of arthropods, such as insects, which occurs between each moult (''ecdysis'') until sexual maturity is reached. Arthropods must shed the exoskeleton in order to ...

s. Near the end of each instar, the larva undergoes a process called

apolysis Apolysis ( "discharge, lit. absolution") is the separation of the cuticle from the epidermis in arthropods and related groups (Ecdysozoa). Since the cuticle of these animals is also the skeletal support of the body and is inelastic, it is shed dur ...

, in which the

cuticle A cuticle (), or cuticula, is any of a variety of tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Various types of "cuticle" are non- homologous, differing in their origin, structu ...

, a tough outer layer made of a mixture of

chitin Chitin (carbon, C8hydrogen, H13oxygen, O5nitrogen, N)n ( ) is a long-chain polymer of N-Acetylglucosamine, ''N''-acetylglucosamine, an amide derivative of glucose. Chitin is the second most abundant polysaccharide in nature (behind only cell ...

and specialized proteins, is released from the softer

epidermis The epidermis is the outermost of the three layers that comprise the skin, the inner layers being the dermis and Subcutaneous tissue, hypodermis. The epidermal layer provides a barrier to infection from environmental pathogens and regulates the ...

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.

Larvae host plants

Unlike some caterpillars, larvae of this butterfly feed on a variety of host plants.

American elm ''Ulmus americana'', generally known as the American elm or, less commonly, as the white elm or water elm, is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can ...

(''Ulmus americanus''), red elm (''Ulmus rubra''), hackberry (''Celtis''), Japanese hop (''Humulus japonicus''), nettles (''Urtica''), and false nettle (''Boehmeria cylindrica'') are the main ones listed.Question Mark
, Butterflies and Moths of North America They may also feed on clearweed (''Pilea pumila'').

Pupae

Once the larvae have undergone their last instar, the caterpillars pupate in a chrysalis. Unlike many moths, which build cocoons to pupate in, the majority of butterfly pupae are "naked", meaning without the protection of the earth or a cocoon to protect them. After it has reached the end of its last instar, it sheds its skin (molting or apolysis), becoming a soft fleshy pupae, wherein upon close observation many parts of the future butterfly can be seen prior to the new skin hardening. As it hardens, the pupa takes on colors of its surroundings, providing it with excellent camouflage. After many days to a couple of weeks the butterfly emerges, usually in the morning or afternoon hours.

Adults

As an adult butterfly, the question mark seeks out rotting fruit, tree sap, dung, or

carrion Carrion (), also known as a carcass, is the decaying flesh of dead animals. Overview Carrion is an important food source for large carnivores and omnivores in most ecosystems. Examples of carrion-eaters (or scavengers) include crows, vultures ...

as food sources. Only when these are unavailable do question marks visit flowers for nectar. This dietary adaptation is especially beneficial to the late spring / overwintering / early spring brood when nectar sources may be limited.

Recorded locations

This species has been found in southern Canada and all of the eastern United States except peninsular Florida, west to the eastern edge of the Rocky Mountains, south to southern Arizona and Mexico. It is known to be migratory.

Flight times

Generally speaking, the question mark flies and lays eggs in the spring until the end of May. The summer adults emerge and fly from May–September, laying eggs that develop into the winter form; these adults appear in late August and spend the winter in various shelters.Scott, J. A. (1999)
Hibernal diapause of North American Papilionoidea and Hesperioidea.
''Journal of Research on the Lepidoptera'' 18(3):171-200.

Gallery

File:Question Mark chrysalis - Polygonia interrogationis, Herndon, Virginia (36178969994).jpg, Chrysalis File:Question mark caterpillar.png, Larva File:Question Mark Polygonia interrogationis Flower 2506px.jpg, Dorsal File:Question Mark - Polygonia interrogationis, Natchez Trace, near Natchez, Mississippi - 25097157843.jpg, Ventral File:Wood butterflies (17735539850).jpg, Mounted

References

External links

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on the UF / IFAS Featured Creatures Web site {{Taxonbar, from=Q3130138 Nymphalini Butterflies of North America Taxa named by Johan Christian Fabricius Butterflies described in 1798 Lepidoptera of Canada