This article is a second part of the themed issue “Aberrant cytogenetic and reproductive patterns in the evolution of Paraneoptera insects”, prepared by the Russian-Bulgarian research team. Here, analysis of aberrations related to the egg development is provided based on literature data and the author’s own investigations. Evolutionary aspects of ovoviviparity/viviparity are also briefly discussed. Material and methods, terminology and nomenclature of taxonomic names are listed in the first paper of the issue (Gavrilov-Zimin et al. 2021).

中文翻译：

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副翅目中的卵保留、胎生和卵胎生

本文是俄罗斯-保加利亚研究小组编写的主题问题“副翅目昆虫进化中的异常细胞遗传学和繁殖模式”的第二部分。在此，基于文献数据和作者自己的调查提供了与卵子发育相关的畸变分析。还简要讨论了卵胎生/胎生的进化方面。分类名称的材料和方法、术语和命名法列在该问题的第一篇论文中（Gavrilov-Zimin 等人，2021 年）。