性成熟时,身体前端的几个体节体壁的腺体加厚,膨胀而形成一环带(Clitellum),这是寡毛类动物的第二性征,即性成熟时才出现的特征。水生种类环带仅出现在1~2个体节内。
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...缨鳃蚕], clam worms [沙蚕]) • Class Hirudinea (Leeches) 16 Class Oligochaeta • Few setae(刚毛) • Clitellum(生殖带) • No parapodia(疣足) • Monoecious(雌雄同体) 17 Lumbricus terrestris • Feed on decaying organic matter • Enrich ...
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N a thickened saddle-like region of epidermis in earthworms and leeches whose secretions bind copulating worms together and later form a cocoon around the eggs (蚯蚓、水蛭的)生殖带
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