教材分析昆虫的种类繁多,约有一百多万种。它既在节肢动物门七个纲中首屈一指,也是整个动物界中最大的一纲,其种类和个体数量都凌驾于其他所有动物总和之上,而且与人类关系最为密切。由于蝗虫具有分布极广、结构典型、个体较大和易于观察的特点,所以它是昆虫纲 Textbook analysis Insects of a wide variety, about more than one million species. It is second to none in the seven classes of arthropods and the largest in the entire animal kingdom, with its species and individuals overrun all other animals and most closely related to humans. As locusts have a very wide distribution, the structure of typical, large and easy to observe the characteristics of individuals, so it is Insecta