[Crucial stages of embryogenesis of Rana arvalis: Part 3. Modularity or developmental integrity]

Static analysis of the morphometry of larvae of the postembryonic stages of development of Rana arvalis made it possible to estimate the extent and nature of correlations between developing structures. Considering a correlation as a manifestation of multiple physiological interactions between developing structures, we showed that the most likely scenario is the development of larval structures as a holistic process that is accompanied by an increase in the proportion of minor correlative interactions with an increase in the total number of structures. During the critical periods of development, an increase in the proportion of stronger correlative interactions between the structures that form at this stage of development is observed.