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节肢动物门是动物界中最大的一门。节肢动物的种类最多、数量最大、分布最广,与人类的关系也最密切。节肢动物的身体由很多体节构成,身体的分部很明显,可以分为头、胸、腹三部分。身体表面有坚硬的外骨胳,有保护作用。头部有触角、眼和口器,是感觉和取食的中心。胸部有分节的附肢和翅,是运动的中心。腹部有内脏器官和生殖器官,是代谢和生殖的中心。节肢动物的形态结构和生理功能都比环节动物更加复杂而高等,大大加强了对生活环境的适应能力,因此,它们能够广泛生活在陆上、水中、空中、地下等各种生活环境中。《节肢动物门》这章教材是动物学课本中最大的
Arthropods are the largest of the animal kingdoms. Arthropods have the largest number, largest number, and widest distribution, and they have the closest relationship with humans. The arthropod’s body is composed of many body segments. The body’s division is obvious and can be divided into head, chest, and abdomen. The body has a hard outer skeleton and has a protective effect. The tentacles, eyes, and mouthparts on the head are the center of feeling and feeding. There are segmented appendages and wings on the chest and it is the center of exercise. The abdomen has internal organs and reproductive organs and is the center of metabolism and reproduction. Arthropods are more complex and advanced than the annelids in their morphological structure and physiological functions, which greatly enhance their adaptability to the living environment. Therefore, they can be widely used in various living environments such as land, water, air, and underground. This book is the largest of the zoology textbooks.