Polygonia interrogationis

Question mark
Upperside
Underside
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Nymphalidae
Genus:	Polygonia
Species:	P. interrogationis
Binomial name
Polygonia interrogationis (Fabricius, 1798)
Synonyms
Nymphalis interrogationis

Nymphalis interrogationis

Polygonia interrogationis, the question mark, is a North American nymphalid butterfly. 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 that resembles a dead leaf. The adult butterfly has a wingspan of 4.5–7.6 cm (1.8–3.0 in). 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."

Like other species in the order of Lepidoptera, the question mark is an insect that undergoes four life stages, also known as holometabolis or complete metamorphosis. These four life stages are embyro (ova or egg), larva (in this case, caterpillar), pupa (chrysalis), and imago, (or adult/ butterfly).

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 of the question mark butterfly, like all lepdiopteran larvae, 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.

Unlike some caterpillars, larvae of this beautiful butterfly feed on a variety of host plants. American elm (Ulmus americanus), red elm (Ulmus rubra), hackberry (Celtis), Japanese hop (Humulus japonicus), nettles (Urtica), and false nettle (Boehmeria cylindrica) are the main ones listed.

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.

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Wikipedia