Egg retention, viviparity and ovoviviparity in Paraneoptera

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).

Complete set of 4 see https://compcytogen.pensoft.net/issue/3283/

Part 1 Introduction to the study of chromosomal and reproductive patterns in Paraneoptera see https://phthiraptera.myspecies.info/node/96010

Part 3 Aberrant ontogeneses and life cycles in Paraneoptera see https://phthiraptera.myspecies.info/node/96067

Part 4 Comparative analysis of chromosome numbers and sex chromosome systems in Paraneoptera (Insecta) see https://phthiraptera.myspecies.info/node/96065