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IB DP Biology Topic 1: Cell biology 1.5 The origin of cells

Tappania is a putative eukaryotic microfossil the type acritarch found in sediments up to 1,630 million years old. Its morphology suggests it is related to the fungus. Two types have been identified to date:Tappania plana appears in Paleoproterozoic Paleoproterozoic formations of India (Deonar) and northern China, both with an age of 1,630 mya. It is a roughly spherical acritarch, 30-60 μm in diameter, with one or two small necks. Small branched and / or partitioned tubes emerge from the central body. Tappania sp. It appears in deposits of the Neoproterozoic in northern Australia, northwestern US and central Siberia, with an age of up to 850 mya and 200-300 mya stratigraphic presence. It is larger that Flat Tappania, up to 300 μm in length, with an elongated or lobed central body from where hyphae-like tubular extensions radiate. These hyphae form a three-dimensional network around the central body.
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