Piotr Ivanov

Piotr Pavlovich Ivanov (Russian: Петр Павлович Иванов; 9 April 1878 – 15 February 1942) was a Soviet embryologist and a professor.

Kovalevsky scholarship to visit the Sunda Islands and collected a large number of invertebrates and made studies of Limulus mollucanus, Xiphosura and Scolopendra.

He published a book on general and comparative embryology in 1937 in which he proposed the theory of primary heteronomy which he had begun in 1928.

He considered the larval somites to be more evolutionarily ancient and noted that some segmented animals lacked eusomites.

[3][4] Ivanov's school of students who became embryologists of note included P. G. Svetlov, O. M. Ivanova-Kazas, L. N. Zhinkin, D. M. Steinberg, V. A. Tsvileneva, A. G. Knorre, S I. Bogomolov and K. A.