one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming
例句
In addition, these four kinds of megalopa are different on the fifth pleopod, third maxilliped and fifth pereiopod. 其次，四种蟳大眼幼体在第五泳足、第三颚足及第五步足都有较明显的差异。
Histological Changes and Cement Gland Characters of Female Pleopod of Eriocheir sinensis in Different Physiological Stages 中华绒螯蟹不同生理阶段腹肢的结构变化及粘液腺的发育特征
