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The terminology used herein to describe Dickinsonia costata, and various morphological features discussed in the text. Images are of specimens SAM P40135 (D14, centre) and SAM P49355 (D17, right). Unit count is the total number of units counted within a specimen. Unit number denotes the order in which units were added in an individual specimen, assuming growth from a specific generative zone. Scale bars, 10 mm. (Online version in colour.)
