The external morphology of Lepidoptera is the physiological structure of the bodies of insects belonging to the order Lepidoptera, also known as butterflies and moths.Lepidoptera are distinguished from other orders by the presence of scales on the external parts of the body and appendages, especially the wings. enable_page_level_ads: true Mandibles: The mandibles are a pair of jaws suspended from the head of the bee. It is the same as a long tube and coil that is located on the beneath of the head of the butterfly. There are five basic components that form these mouthparts: It is also called as proboscis. A butterfly doesn't have a mouth. Share Your PDF File The mouth parts are of siphoning type and are comprised of a basal transverse and rectangular labrum, a pair of reduced mandibles, a pair of maxillae (galeae) forming a long and coiled proboscis and paired labial and maxillary palps. Mandibulate Mouthparts. They only open up after receiving the food stimulus. 1). This is the slide of head and mouthparts of Butterfly. Our mission is to provide an online platform to help students to share notes in Biology. When a female mosquito sits on the host, it presses the proboscis against the skin. Labrum: The mouth is covered by labrum. These mandibles are provided with two pairs of muscles namely, adductor and abductor muscles to help the movement of mandibles only in horizontal plane against each other. I don't need all of that information just on the digestive system. Labellum: The glossae are greatly elongated to form a hairy, flexible tongue. The word “butterfly” has been in the English language for centuries. ' The butterfly or moth's collection of mouthparts, the proboscis, is modified for drinking, curls up when not in use, and extends like a drinking straw when it feeds. The number of stylets varies with different insects. Also the larvae of mosquito, housefly butterfly and honeybee also have biting and chewing mouthparts. In butterflies and flies, the mouthparts consist of a proboscis adapted for using capillary action to pull thin films of fluid from surfaces for subsequent feeding. The maxillary palps and labium pre greatly reduced and degenerate and labial palps are well developed and jointed. One of the other mouthpart types that are easily recognizable are butterfly and moth proboscises. [CDATA[ Hypopharynx: It is chitinous, grooved and a rod-like structure found hanging into the preoral cavity. Homometabolous insects have different types of mouthparts in their larvae and adults. Labial palms are elongate and four segmented. A butterfly is a flying insect of the order ‘Lepidoptera’ (an order of insects with broad wings which have minute overlapping scales). What are the functions of labrum and labium in the insect mouthparts? Mandibles: Two mandibles are present each on either side. The stipes has five segmented maxillary palp on its outer side. Nectar is then squeezed by galeae and is deposited in the cavity formed by the paraglossae. Homometabolous insects have different types of mouthparts in their larvae and adult stages. A hematophagous arthropod with highly specialized piercing-sucking mouthparts that penetrate individual capillaries and then feed directly on host blood b. Proboscis: The proboscis of the honeybee is not a permanent functional organ, but it is formed temporarily by assembling parts of the maxillae and the labium to produce a unique tube for drawing up liquids such as sweet juices, nectar, water and honey. The epipharynx is covered with chemoreceptors and mechanoreceptors used in food selection. The tongue (glossae) is trusted into flower, which gets smeared with nectar. Adult butterflies do not have mouthparts capable of eating other insects. Give the examples of Biting and chewing mouthparts. Due to the sucking action of cibarium muscles and pharyngeal muscles, the nectar is sucked up. The proboscis is divisible into rostrum, haustellum and labellum. ‘Skippers differ from butterflies in that they have thicker bodies, better eyes, stronger […] Antennae are formed and the chewing mouthparts of the caterpillar are transformed into the sucking mouthparts of the butterfly. We have loaded Previous years questions with explanations...for all competitive exams. Fig. This biting and chewing type of mouthparts are considered as the most primitive and unspecialized of all the mouthpart types. The following is the structure of each of the mouthpart, Rostrum: It is the basal part of the proboscis and is proximally articulated with the head capsule. Labium includes two segments namely broad rectangular sub-mentum and a triangular mentum. Most of the butterfly mouth is reduced and the parts don’t have a function anymore (in most butterflies). Also pre-mentum is present in front of the mentum. Privacy Policy3. These mouthparts help the cockroach to bite and chew on hard stuffs, consume soft stuffs and also lap upon liquids. When the butterfly emerges from its chrysalis, its … These mouthparts are characterized by stylets which are long and pointed. The galeae fit tightly lengthwise, against the elongated labial palps and they in turn roof over the elongated glossae (tongue) to form a temporary food channel through which saliva is discharged. The mouthparts of butterfly and moths are siphoning and sucking type. Share Your Word File 1. TOS4. However, two parts, the maxillary galeae fused to form the butterfly tongue which is called the proboscis. The sucking action of muscles of cibarium and pharyngeal muscles help in sucking the blood through the food canal. For example, the caterpillar stage of butterflies and moths has chewing mouthparts while the mouthparts of adult butterflies are siphoning. (a) Positions of the proboscis showing, from left to right, at rest, with proximal region uncoiling, with distal region uncoiling, and fully extended with tip in two of many possible different positions due … Biology. Ask your question. Secondary School. In all “primitive” insects, the mouthparts are adapted for grinding, chewing, pinching, or crushing bits of solid food. Accumulated nectar is then drawn into oesophagus by the pharyngeal pump. This pressure is generated in the stipes which is associated with each galea. Yeast: Origin, Reproduction, Life Cycle and Growth Requirements | Industrial Microbiology, How is Bread Made Step by Step? These types of mouth parts are present in almost all the bloodsucking insects like tse-tse fly, bed bug etc. Zoology, Practicals, Invertebrates, Butterfly, Head and Mouth Parts of Butterfly. The salivary duct opens into salivarium at the base of the hypopharynx. The mouth parts are of siphoning type and are comprised of a basal transverse and rectangular labrum, a pair of reduced mandibles, a pair of maxillae (galeae) forming a long and coiled proboscis and paired labial and maxillary palps. Butterflies do not possess biting mouthparts that are able to sink into any prey. • Muscles attached to the labrum move it outward, away from the other mouthparts and inward toward the other mouthparts Butterflies are the adult flying stage of certain insects belonging to an order or group called Lepidoptera. These similar mouthparts are an example of homologous organs. According to scientific studies, butterflies have a siphoning-sucking mouthpart composition. The other examples include grasshopper, dragonfly and beetle. Labrum-epipharynx is a stylet that has a ventral groove, which forms the food canal with the hypopharynx. Why do lymph nodes often swell and become tender or even painful when you are sick? These are known as “mandibulate” mouthparts because they feature prominent chewing mandibles. The labrum-epipharynx and hypopharynx are inserted into the wound. The mouthparts of female mosquito are piercing and sucking type. Labium: Labium is formed by the fusion of second pair of maxillae. The basic segmental character of the mouthparts is most apparent in insects that bite off fragments of food and then chew it before ingesting it (Fig. Maxillolabial Structures: Maxillolabial Structures are modified to form the lapping tongue. The tongue unit consists of the two galeae of maxillae, two labial Palps and an elongated flexible hairy glossa of labium. Siphoning-sucking mouthparts are mostly limited to adult butterflies and moths (Order Lepidoptera). The labella gently dabs liquids into the proboscis, which then sucks up the liquid. 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