在日本沼虾川，这种特殊结构 是卵索(funiculus)和卵柄(egg stalk)。目前，学术界对卵索以及卵柄的来源尚存争议。
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Embryo attachment was affected by the differentiation of egg membrane. Egg stalk and outer egg membrane were formed from mucus during development.
黏液腺在胚胎附着过程中形成卵柄和外层卵膜，胚胎是依靠卵柄或卵索附着于腹肢的刚毛上，进而完成胚胎发育过程。
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