The biogenetic law and the Gastraea theory: From Ernst Haeckel's discoveries to contemporary views. Issue 1 (16th March 2021)

• Record Type: Journal Article
• Authors: Levit, Georgy S.; Hoßfeld, Uwe; Naumann, Benjamin; Lukas, Paul; Olsson, Lennart
• Other Names: Uesaka Masahiro guestEditor.; Irie Naoki guestEditor.
• Is Part Of: Journal of experimental zoology. Volume 338:Issue 1/2(2022)
• Page Start: 13
• Page End: 27
• Publication Date: 2021-03-16
• Subjects: heterochrony -- Magosphaera planula -- ontogeny -- phylogeny; Developmental biology -- Periodicals; Evolution (Biology) -- Periodicals; Molecular evolution -- Periodicals; Zoology -- Periodicals; Evolution, Molecular -- Periodicals; Developmental Biology -- Periodicals; Zoology -- Periodicals; 591
• DOI: 10.1002/jez.b.23039
• Languages: English
• ISSNs: 1552-5007

Abstract

Abstract: More than 150 years ago, in 1866, Ernst Haeckel published a book in two volumes called Generelle Morphologie der Organismen ( General Morphology of Organisms ) in the first volume of which he formulated his biogenetic law, famously stating that ontogeny recapitulates phylogeny. Here, we describe Haeckel's original idea as first formulated in the Generelle Morphologie der Organismen and later further developed in other publications until the present situation in which molecular data are used to test the "hourglass model, " which can be seen as a modern version of the biogenetic law. We also tell the story about his discovery, while traveling in Norway, of an unknown organism, Magosphaera planula, that was important in that it helped to precipitate his ideas into what was to become the Gastraea theory. We also follow further development and reformulations of the Gastraea theory by other scientists, notably the Russian school. Elias Metchnikoff developed the Phagocytella hypothesis for the origin of metazoans based on studies of a colonial flagellate. Alexey Zakhvatin focused on deducing the ancestral life cycle and the cell types of the last common ancestor of all metazoans, and Kirill V. Mikhailov recently pursued this line of research further. Abstract : A diagram illustrating the inspirational influence of the enigmatic Magosphaera planula on Heckel's Gastraea theory and its connection to his biogenetic law. Highlights: How Ernst Haeckel developed the ideas behind the Biogenetic law and the Gastraea theory is presented. Haeckel's discovery of an unknown organism, Magosphaera planula, that was important for the development of the Gastraea theory, is described.