异脚类，端足目动物异脚类的一种小甲壳纲动物，如滨海的水蚤，体侧扁，无甲壳。
A small crustacean of the order amphipoda such as the beach flea having a laterally compressed body with no carapace.
左钳和右钳夹持端为宽扁嘴样，夹持面各有相对应不同宽度的横行槽，尾端锁止部为球形；
Each of the right clamp and the left clamp has wide flat holding end, transverse slots of different widths in the holding surface, and spherical locking tail end.
它是由一端封闭并弯成圆弧形的扁黄铜管构成的。
It consists of a flattened brass tube closed at one end and bent into a circular form.
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