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The two-described species of Parvancorina demonstrate extremes in shape variation. Specimens so far described have been assigned either to P. minchami ('Morphotype 1') or P. sagitta ('Morphotype 2'). The middle two specimens show an intermediate Parvancorina morphology. The anchor-shaped ridge has two components: the anterolateral ridge (a), and the medial ridge (m). Scale bars = 2 mm. Specimens A (Field specimen 1TF plinth), C (SAM P40433) and E (SAM NP27) are from Flinders Ranges deposits. Specimens B (PIN no. 399/6290), D (PIN no. 3993/6298) and F (PIN no. 4853/92) are from White Sea deposits (modified from Naimark & Ivantsov 2009).
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If we could capture a glimpse of the earliest macroscopic communities on Earth, what might they have looked like? The globally distributed fossils of the Ediacara biota represent the earliest-known examples of multicellular life, and are our best chance of understanding how early macroscopic life evolved on Earth. The Ediacaran fossils of the Flind...
