Briefly describe the structural characteristics and functions of the chewing mouthpart of the locust.
Briefly describe the structural characteristics and functions of the chewing mouthpart of the locust.
发布时间：2025-03-13 09:20:33
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答案：【计分规则】: There are five basic components of the chewing mouthpart:1）labrum; 2）hypopharynx; 3）mandibles; 4）maxillae; 5）labium. The labrum forms the roof of the preoral cavity and mouth and covers the base of the mandibles. Projecting forwards from the back of the preoral cavity is the hypopharynx; The mandibles cut and crush food and may be used for defense; generally they have an apical cutting edge and the more basal molar area grinds the food. Behind the mandibles lie the maxillae, each consisting of a basal part composed of the proximal cardo and the more distal stipes and, attached to the stipes, two lobes. Functionally, the maxillae assist the mandibles in processing food; the pointed and sclerotized lacinae hold and macerate the food, whereas the galeae and palps bear sensory setae and chemoreceptors which sample items before ingestion. The labium, which is believed to be homologous to the second maxillae of Crustacea. There are two main parts to the labium: the proximal postmentum, closely connected to the posteroventral surface of thehead; and the free distal prementum, typically bearing a pair of labial palps lateral to two pairs of lobes.
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