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鲎(Tachypleus tridentatus Leach)是我国东南沿海的名贵珍稀动物,俗称鲎鱼。隶属节肢动物门、肢口纲、剑尾目。鲎是节肢动物中个体最大的种类,其个体可达60厘米以上。体呈瓢状,由头胸部、腹部和剑状尾部三部分组成。全体覆以硬甲,背面圆突,腹面凹陷。头胸甲自前缘至左右两侧呈半圆形,雄性个体前缘两侧各有一凹陷处。背面有复眼和单眼各1对。头胸部有附肢6对,第1对呈螯状、较小,由3节组成;第2—6对为大型步足,具爬行作用。
Tachypleus tridentatus Leach is a rare and precious animal on the southeast coast of China. It is commonly known as carp. Affiliated arthropods, limbs Gang, sword tail. Aphids are the largest species of arthropods, and individuals can reach more than 60 cm. The body is scoop-shaped and consists of three parts, the cephalothorax, the abdomen, and the sword-shaped tail. The whole body is covered with hard armor, the back is round and the ventral surface is sunken. The head breastplate is semicircular from the leading edge to the left and right sides. There are depressions on both sides of the front edge of the male. On the back there are 1 pair of compound eyes and monocular eyes. There are 6 pairs of appendages in the head and thorax. The first pair is chelated and smaller, consisting of 3 sections. The 2nd to 6th pair is a large step and has a crawling effect.