Pijnacker L P, Ferwerda M A
J Embryol Exp Morphol. 1976 Oct;36(2):383-94.
The eggs of the parthenogenetic stick insect Carausius morosus, which remain arrested in first meiotic metaphase until oviposition, must be activated in order to develop. The activating agent is oxygen from the air, which enters the egg cell through the micropyle. An exposure shorter than one minute is sufficient to release the blockage. In non-activated (micropyle-less) eggs the first metaphase chromsomes either degenerate or change into an interphase nucleus. This nucleus polyploidizes by endoreduplication, and then either degenerates or multiplies by amitosis. Similarly more generations of nuclei may arise resulting in a chaotic development. These nuclei survive better in the anterior region of the egg. The question of whether the cytoplasmic factors which control nuclear behaviour, also operate in eggs of C. morosus is discussed.
孤雌生殖的竹节虫（Carausius morosus）的卵在第一次减数分裂中期停滞，直到产卵，必须被激活才能发育。激活剂是空气中的氧气，它通过卵孔进入卵细胞。短于一分钟的暴露就足以解除阻滞。在未激活（无卵孔）的卵中，第一次中期染色体要么退化，要么变成间期核。这个核通过核内复制多倍体化，然后要么退化，要么通过无丝分裂增殖。类似地，可能会产生更多代的核，导致发育混乱。这些核在卵的前部存活得更好。文中讨论了控制核行为的细胞质因子是否也在竹节虫卵中起作用的问题。
