The state in some insects between the larva and the imago is known as what?
"Imago In biology, the imago is the last stage an insect attains during its metamorphosis, its process of growth and development; it also is called the imaginal stage, the stage in which the insect attains maturity. It follows the final ecdysis of the immature instars. In a member of the Ametabola or Hemimetabola, in which metamorphosis is ""incomplete"", the final ecdysis follows the last immature or ""nymphal"" stage. In members of the Holometabola, in which there is a pupal stage, the final ecdysis follows emergence from the pupa, after which the metamorphosis is complete, although there is a prolonged period"
"of maturation in some species. The imago is the only stage during which the insect is sexually mature and, if it is a winged species, has functional wings. The imago often is referred to as the adult stage. Members of the order Ephemeroptera (mayflies) do not have a pupal stage, but they briefly pass through an extra winged stage called the subimago. Insects at this stage have functional wings but are not yet sexually mature. The Latin plural of ""imago"" is ""imagines"", and this is the term generally used by entomologists – however, ""imagoes"" is also acceptable. ""Imago"" is Latin"
"collar and a central, domed nipple region, and the larva weaves salivary ""silk"" threads in a circular pattern in this region. The larva also uses its digestive contents to form smears on the cocoon, leading to hardening of the cocoon and a color change to a dark, red-brown. In this stage, in which the organism becomes classified as an imago, the metabolic rate of the imago declines because it must have enough food to survive the winter. Both the imago's body weight and fat body weight decrease. Male larvae are placed in front of the females within the nest, allowing"
"the insect is the winged adult or imago. The surface of both butterflies and moths is covered by scales, each of which is an outgrowth from a single epidermal cell. The head is small and dominated by the two large compound eyes. These are capable of distinguishing flower shapes or motion but not for clearly viewing distant objects. Colour perception is good, especially in some species in the blue/violet range. The antennae are composed of many segments and have clubbed tips (unlike moths that have tapering or feathery antennae). The sensory receptors are concentrated in the tips and can detect"
"which the insect leaves the chamber as an adult. With favorable weather the entire development lasts four to five months. The oviposition takes place in April or May, so the weevils emerge in August or September, but are not sexually active until after the winter. The imago lives from two to three years, during which it reproduce in following seasons. In colder seasons the larval development is longer and then the whole cycle lasts twelve months, resulting that imagos able to reproduce quickly. Biennial generation it is also common, by which the larvae hatch from eggs laid in May, live"
"Instar An instar (, from the Latin ""form"", ""likeness"") is a developmental stage of arthropods, such as insects, between each moult (""ecdysis""), until sexual maturity is reached. Arthropods must shed the exoskeleton in order to grow or assume a new form. Differences between instars can often be seen in altered body proportions, colors, patterns, changes in the number of body segments or head width. After moulting, i.e. shedding their exoskeleton, the juvenile arthropods continue in their life cycle until they either pupate or moult again. The instar period of growth is fixed; however, in some insects, like the salvinia stem-borer"
"Hemimetabolism Hemimetabolism or hemimetaboly, also called incomplete metamorphosis and paurometabolism, is the mode of development of certain insects that includes three distinct stages: the egg, nymph, and the adult stage, or imago. These groups go through gradual changes; there is no pupal stage. The nymph often somewhat resembles the adult stage but lacks wings and functional reproductive organs. The Orders that contain hemimetabolous insects are: In aquatic entomology, different terminology is used when categorizing insects with incomplete metamorphosis. Paurometabolism refers to insects whose nymphs occupy the same environment as the adults, as in the family Gerridae of Hemiptera. The hemimetabolous"
"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"
"moth, the number of instars depends on early larval nutrition. Some arthropods can continue to moult after sexual maturity, but the stages between these subsequent moults are generally not called instars. For most insect species, an ""instar"" is the developmental stage of the larval forms of holometabolous (complete metamorphism) or nymphal forms of hemimetabolous (incomplete metamorphism) insects, but an instar can be any developmental stage including pupa or imago (the adult, which does not moult in insects). The number of instars an insect undergoes often depends on the species and the environmental conditions, as described for a number of species"
"above the waterfront. If they successfully catch a female copulation takes place in the shelter of water edge willows. After fertilization females fly 20–30 cm above the water and lay eggs (one at a time or in a small packets) into the water. The larvae develop for three years buried in the fine soil of the riverbed. As imagos, they are predators too, their diet consisting of small invertebrates which they capture with they specialized labium called the ""mask"". The emergence of the larvae starts mostly at end of May or June, but it depends highly on location and other"
"initiates insect molting. Then, the larva puparium, a sclerotized or hardened cuticle of the last larval instar, develops into the pupa. Depending on the species, the pupa may be covered in a silk cocoon, attached to different types of substrates, buried in the ground, or may not be covered at all. Features of the imago are externally recognizable in the pupa. All the appendages on the adult head and thorax are found cased inside the cuticle (antennae, mouthparts, etc.), with the wings wrapped around, adjacent to the antennae. The pupae of some species have functional mandibles, while the pupal mandibles"
"(moulting); these stages are called instars. The juvenile forms closely resemble adults, but are smaller and lack adult features such as wings and genitalia. The size and morphological differences between nymphs in different instars are small, often just differences in body proportions and the number of segments; in later instars, external wing buds form. In holometabolous insects, immature stages are called larvae and differ markedly from adults. Insects which undergo holometabolism pass through a larval stage, then enter an inactive state called pupa (called a ""chrysalis"" in butterfly species), and finally emerge as adults. The earliest insect forms showed direct"
"Imaginal disc An imaginal disc is one of the parts of a holometabolous insect larva that will become a portion of the outside of the adult insect during the pupal transformation. Contained within the body of the larva, there are pairs of discs that will form, for instance, the wings or legs or antennae or other structures in the adult. The role of the imaginal disc in insect development was first elucidated by Jan Swammerdam. During the pupal stage, many larval structures are broken down, and adult structures, including the discs, undergo rapid development. Each disc everts and elongates, with"
"to white or red in older bugs. The colour of the abdomen changes at the same time from buff to black. Such age-specific changes in the imago coloration, are connected with sexual maturation of the bugs and often take place in diapausing imagos at the time they are becoming active again. The eggs are cylindrical, buff-colored with a dark pattern. They are laid on the stems and inflorescences of host plants in batches usually of about twelve eggs in two neat rows. Each female lays sixty to eighty eggs over a period of four to six weeks. The nymph is"
"edges and blackberry bushes. The insect can also be very common where there are creeping thistles (""Cirsium arvense"") or swamp thistles (""Cirsium palustre""), oregano (""Origanum vulgare""), forest scabious (""Knautia sylvatica""), or hogweed (""Heracleum sphondylium"") which are favorite food plants of the imagos. The males fly in search of newly hatched females in slow, uninterrupted flight and flutter round, about and between grass stems. The imagos fly in one generation from mid-June to late August. The caterpillars feed on many grasses. Among the food plants are: The female scatters non-adhesive eggs in a slow low flight over grasslands. The larva is"
"eyes, and the mouthparts. Of all the insect orders, Orthoptera displays the most features found in other insects, including the sutures and sclerites. Here, the vertex, or the apex (dorsal region), is situated between the compound eyes for insects with a hypognathous and opisthognathous head. In prognathous insects, the vertex is not found between the compound eyes, but rather, where the ocelli are normally. This is because the primary axis of the head is rotated 90° to become parallel to the primary axis of the body. In some species, this region is modified and assumes a different name. The thorax"
"classified by their body type: The larval stage is variously adapted to gaining and accumulating the materials and energy necessary for growth and metamorphosis. Most holometabolous insects pass through several larval stages, or instars, as they grow and develop. The larva must moult to pass from each larval stage. These stages may look very similar and differ mostly in size, or may differ in many characteristics including, behavior, color, hairs, and spines, and even number of legs. Differences between larval stages are especially pronounced in insects with hypermetamorphosis. The final larval stage in some insects is called a prepupa. Prepupae"
"is really their first nymphal stage) where, in general, they remain together in sibling communities. This is made possible by the excretion of an aggregation pheromone. In case of danger, another pheromone is released which causes dispersal. The larval stage is followed by four more nymphal stages as well as moulting between each one. The green shield bug displays different colouration during each nymphal stage, light brown, black or green-black, and in the final stage, the imago, is bright green with short wings. Usually the imago stage is reached in September, with hibernation occurring in November. Green shield bug The"
"structures such as cocoons, nests, or shells. The pupal stage follows the larval stage and precedes adulthood (""imago"") in insects with complete metamorphosis. The pupa is a non-feeding, usually sessile stage, or highly active as in mosquitoes. It is during pupation that the adult structures of the insect are formed while the larval structures are broken down. The adult structures grow from imaginal discs. Pupation may last weeks, months, or even years, depending on temperature and the species of insect. For example, pupation lasts eight to fifteen days in monarch butterflies. The pupa may enter dormancy or diapause until the"
"were probably feeding in this phase of life too as the lines between the instars were much more diffuse and gradual than today). Adult form was reached several moults before maturity. They probably didn't have more instars after becoming fully mature. This way of maturing is how Apterygota do it, which moult even when mature, but not winged insects. Modern mayflies have eliminated all the instars between imago and nymph, except the single instar called subimago, which is still not (at least not in the males) fully sexually mature. The other flying insects with incomplete metamorphosis (Exopterygota) have gone a"
"insects are those whose nymphs, called naiads, occupy aquatic habitats while the adults are terrestrial. This includes all members of the orders Plecoptera, Ephemeroptera, and Odonata. Aquatic entomologists use this categorization because it specifies whether the adult will occupy an aquatic or semi aquatic habitat, or will be terrestrial. This classification system is similar to previously used nomenclature in terrestrial entomology. Hemimetabolism Hemimetabolism or hemimetaboly, also called incomplete metamorphosis and paurometabolism, is the mode of development of certain insects that includes three distinct stages: the egg, nymph, and the adult stage, or imago. These groups go through gradual changes; there"
"Larva A larva (plural: ""larvae"" ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. The larva's appearance is generally very different from the adult form (""e.g."" caterpillars and butterflies) including different unique structures and organs that do not occur in the adult form. Their diet may also be considerably different. Larvae are frequently adapted to environments separate from adults. For example, some larvae such as tadpoles live almost exclusively in aquatic environments, but can live outside water"
"the fusion of terga or terga and sterna to form continuous dorsal or ventral shields or a conical tube. Some insects bear a sclerite in the pleural area called a laterotergite. Ventral sclerites are sometimes called laterosternites. During the embryonic stage of many insects and the postembryonic stage of primitive insects, 11 abdominal segments are present. In modern insects there is a tendency toward reduction in the number of the abdominal segments, but the primitive number of 11 is maintained during embryogenesis.Variation in abdominal segment number is considerable. If the Apterygota are considered to be indicative of the ground plan"
"of spiny projections. A larva generally passes through five instars in a period of four to five weeks, after which it will anchor itself to a suitable surface, usually in a protected spot on the plant, where it changes its skin once more, forming a typical coccinellid pupa, from which it emerges as a beetle imago after several days. Many species have just one or perhaps two generations in a year. Commonly, such species have the remarkable habit, which also occurs in some other coccinellid subfamilies, of migrating tens of kilometres to the highest point on a nearby ridge or"
"Each such pair occupies one segment, though not all segments in modern insects bear any visible appendages. Of all the insect orders, Orthoptera most conveniently display the greatest variety of features found in the heads of insects, including the sutures and sclerites. Here, the vertex, or the apex (dorsal region), is situated between the compound eyes for insects with hypognathous and opisthognathous heads. In prognathous insects, the vertex is not found between the compound eyes, but rather, where the ocelli are normally found. This is because the primary axis of the head is rotated 90° to become parallel to the"
"Insect morphology Insect morphology is the study and description of the physical form of insects. The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history. Three physical features separate insects from other arthropods: they have a body divided into three regions (head, thorax, and abdomen), have three pairs of legs, and mouthparts located ""outside"" of the head capsule. It is this position of the mouthparts which divides them from their closest relatives, the non-insect hexapods, which includes Protura, Diplura, and Collembola. There is enormous variation in body structure amongst insect"
"spurs on the stem. The thorax, which develops from segments 2, 3, and 4 of the larva, consists of three invisibly divided segments, namely prothorax, metathorax, and mesothorax. The organs of insect locomotion – the legs and wings – are borne on the thorax. The forelegs spring from the prothorax, the forewings and middle pair of legs are borne on the mesothorax, and the hindwings and hindlegs arise from the metathorax. In some cases, the wings are vestigial. The upper and lower parts of the thorax (terga and sterna respectively) are composed of segmental and intrasegmental sclerites which display secondary"
"state insect. The 'dogface' name comes from a wing pattern resembling a dog's face (some think it looks like a poodle) which is found on the male of the species. Its wings are an iridescent bluish-black, orange and sulfur-yellow in color. The female has a small black dot on each of its yellow forewings. The typical forewing length is between . Larvae feed on ""Amorpha californica"", false indigo. Adults feed on flower nectar. They are said to be especially fond of purple flowers. In the California chaparral and woodlands habitats of the Santa Ana Mountains in Southern California, the adult"
"Its proximal end forms a more or less distinct head bent toward the femur, a device allowing the tibia to be flexed close against the under surface of the femur. The terms profemur, mesofemur and metafemur refer to the femora of the front, middle and hind legs of an insect, respectively. Similarly protibia, mesotibia and metatibia refer to the tibiae of the front, middle and hind legs. The tarsus of insects corresponds to the penultimate segment of a generalized arthropod limb, which is the segment called the propodite in Crustacea. adult insects it is commonly subdivided into from two to"
"over the abdomen. Their immature stages are aquatic fresh water forms (called ""naiads"" or ""nymphs""), whose presence indicates a clean, unpolluted environment. They are unique among insect orders in having a fully winged terrestrial adult stage, the subimago, which moults into a sexually mature adult, the imago. Mayflies ""hatch"" (emerge as adults) from spring to autumn, not necessarily in May, in enormous numbers. Some hatches attract tourists. Fly fishermen make use of mayfly hatches by choosing artificial fishing flies that resemble the species in question. One of the most famous English mayflies is ""Rhithrogena germanica"", the fisherman's ""March brown mayfly""."
"veins and lines similar to that of the leaves of the host plant, all veins ending at the pointed lower end of the pupa. The pupa becomes transparent on the eve of hatching, with the wings and head clearly visible. The hatching takes place on the 12th and 13th day of pupation. Eclosion: All of the pupae hatched on two consecutive days between 8 a.m and 9 a.m. The imago rested for about an hour and went on wings to rest in the shady bushes nearby. This butterfly is widely distributed across parts of India, Myanmar, Indo China, Peninsular Malaysia"
"subimago that physically resembles the adult, but which is usually sexually immature and duller in colour. The subimago often has partially cloudy wings fringed with minute hairs; its eyes, legs and genitalia are not fully developed. Subimagos are generally poor fliers, and typically lack the colour patterns used to attract mates. After a period, usually lasting one or two days but in some species only a few minutes, the subimago moults to the full adult form, making mayflies the only insects where a winged form undergoes a further moult. Adult mayflies, or imagos, are relatively primitive in structure, exhibiting traits"
"stage to avoid extreme conditions, in which case this stage can last several months. The eggs of some types of insects, such as tsetse flies, or aphids (which are hemimetabolous), which hatch before they are laid. The second stage of the holometabolous life cycle is the larva (plural: larvae). Many adult insects lay their eggs directly onto a food source so the larvae may begin eating as soon as they hatch. Larvae never possess wings or wing buds, and have simple rather than compound eyes. In most species, the larval stage is mobile and worm-like in form. Larvae can be"