破卵齿 egg tooth
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亦称破卵器。低等哺乳类(鸭咀兽和针鼹)、鸟类、爬虫类、昆虫类(蟋蟀、蝗虫、蜻蜓、蚤等)的胚胎孵化时,在胚的口吻上出现的坚硬组织(昆虫类中胚胎上和覆盖胚的膜上生有突起),用它穿破卵壳及卵膜。这种突起称为破卵齿。孵化后便逐渐退化或脱落。
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