All other arachnids have a pair of pincers or scissor-like chelicerae. The labium is innervated by the sub-esophageal ganglia. In non-chewing insects, such as adult Lepidoptera, the maxillae may be drastically adapted to other functions. The mandibles are used to clip pieces of vegetation, gather wood fibers, dig nests, or to capture and disassemble prey. On the other hand, even structures that physically are almost identical, and share almost identical functionality as well, may not be homologous; their analogous functions and appearance might be the product of convergent evolution. Saliva containing anticoagulants, is injected into the food item and blood sucked out, each through different tubes. Flies of the Muscomorpha, including the house fly, Musca domestica, stable fly, Stomoxys calcitrans, blow flies (family Calliphoridae), and many others, lack mandibles altogether, and the mouthparts are designed for sponging up liquids.  This same simple structure is seen in all of the remaining Polyneopteran insect orders, with the exception of the Paraneoptera (Hemiptera, Thysanoptera, and Phthiraptera). I’m sure it can’t be pleasant. Predatory bugs such as assassin bugs have the same mouthparts, but they are used to pierce the cuticles of captured prey. The earliest insects had chewing mouthparts. Do insects have uniramous or biramous (two-branched) appendages? The mouthparts of orthopteran insects are often used as a basic example of mandibulate (chewing) mouthparts, and the mandibles themselves are likewise generalized in structure. Musca is a fly that belongs to the family of Muscidae. Based on this model, insect’s mouthparts are made of 5 main structures: labrum, mandibles, maxillae, hypopharynx and labium. During feeding, however, it extends to reach the nectar of flowers or other fluids. For example, true bugs, such as shield bugs, feed on the fluids of plants. All but a few adult Lepidoptera lack mandibles (the superfamily known as the mandibulate moths have fully developed mandibles as adults), but also have the remaining mouthparts in the form of an elongated sucking tube, the proboscis. Frizzle: Insects do have teeth, however they are referred to as fangs or mandibles. It assists in swallowing the food. The specific derived morphology o… They operate in a sideways fashion and are used for gripping, biting and cutting. The eggs hatch into nymphs, which moult three times before becoming fully grown, a process that takes about four weeks. The mandibles of adult and larval Odonata appear simple and generalized, although there are typically six or seven mandibular muscles. Unlike the mandibles, but like the labium, the maxillae bear lateral palps on their stipites. A spider has two mandibles on the left and right side of their heads used for chewing or injecting venom. Insects that chew may have small or large, but typically noticeable mandibles, which move in a side-to-side fashion (rather than up and down, as human jaws do). Spiders and other insects that chew have mandibles. Although there are so many different shapes, the insect mouth basically consists of there pairs of limbs. As the saliva dissolves the food, the solution is then drawn up into the mouth as a liquid. The moths and butterflies are major examples of such adaptations. Insects that pierce or suck rather than chew have modified mandibles. Appendages used for movement are attached to the thorax. All these structures function together… Read More Asked by Wiki User. The head is made of 5-7 fused segments and bears the eyes, antennae, and mouthparts.. Spiders do not have the mandibles that are present in insects. The food channel draws liquid and liquified food to the oesophagus by capillary action. The mandibles of a bull ant European honeybee (Apis mellifera) lapping mouthparts, showing labium and maxillae. They are large and hardened, shaped like pinchers, with cutting surfaces on the distal portion and chewing or grinding surfaces basally. Rather they have chelicerae which are jaws with sharp edges. Insects have three major body regions: head, thorax, and abdomen (see Insect Body Regions, right).. For instance, grasshoppers and many other plant-eating insects have sharp-edged mandibles that move side to side. The labrum forms the main feeding tube, through which blood is sucked. Although they do have mandibles, they are too small and weak to be cause for concern. Maxillae in most insects function partly like mandibles in feeding, but they are more mobile and less heavily sclerotised than mandibles, so they are more important in manipulating soft, liquid, or particulate food rather than cutting or crushing food such as material that requires the mandibles to cut or crush. 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