Gavrilov-Zimin, I.A. 2021 Egg retention, viviparity and ovoviviparity in Paraneoptera. Comparative Cytogenetics 15(3): 239–252
Notes: 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.