昆虫学1 1.pptVIP

Agricultural Entomologyteacher: Han qunxin 韩群鑫Tel: E-mail: hqx99@163.com chapter1: Introduction What’s entomology（昆虫学） The distinguished characteristics of insect The importance of insect( the relationship between insect and human) 红珠灰蝶hairstreak 猎蝽reduviidae 兰花螳螂orchid mantis 独角仙Hercules beetle 蝉cicada spider What is entomology Entomology is the study of insects. Entomologists昆虫学家, the people who study insects, observe, collect, rear, and experiment with insects. Research undertaken by entomologists covers the total range of biological disciplines, including evolution, ecology, behavior, anatomy解剖学, physiology, biochemistry and genetics. Modern entomological study commenced in the early 18th century . The distinguished characteristics of insect Question: 1 what are the common characteristics of arthropods? 2 how to distinguish insect from other arthropods? The characteristics of arthropod Series of ringlike segments身体分节 each animal in this group has a body formed of a number of segments Jointed appendages 联合附肢 they have legs and other appendages that are made up of segments jointed together. Exoskeleton 外骨骼 an external skeleton made up of chitin几丁质. The characteristics of arthropod Bilateral symmetry 两侧对称 the arrangement of body parts is such that body can be split down the middle so as to form two equal portions. Ventral nerve cord腹神经索 the nerve cord is found within the lower part of body. Dorsal heart 背心脏 the heart is a simple tubelike structure found within the upper part of the body. The characteristics of insect The word ‘insect’ comes from a Latin word meaning ‘in sections’. The insects are tracheal气管的arthropods, their common characteristics are the following. 昆虫的体躯 身体各节分别集合组成头、胸、腹三个体段 the body of adult insect is divided into head, thorax and abdomen 昆虫的头部 头部具有口器和1对触角，通常还有复眼及单眼，是感觉和取食中心The head, which is the first major division of insect body, bears the mouthparts, anten