ON THE FINDS OF RIPHEAN DIMORPHIC ORGANISMS

Abstract

New nonmineralized gemmating dimorphic microorganisms have been discovered in the Lakhanda Group at the base of the Upper Riphean (ca. 1.025 Ga) of the Uchuro-Maiskii region of southeastern Siberia. The daughter buds are umbrella-shaped or spherical and connected to the parent body by a short or long and narrow filament. These organisms are accompanied by spherical cells, the surface of which is radial in structure. The tentative hydrozoan nature of the new microorganisms is discussed.