Signor–Lipps effect

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Science and technology

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What Wikipedia says

The Signor-Lipps effect is a paleontological principle proposed in 1982 by Philip W. Signor and Jere H. Lipps which states that, since the fossil record of organisms is never complete, neither the first nor the last organism in a given taxon will be recorded as a fossil.

Excerpt from the Wikipedia article “Signor–Lipps effect”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Grady Weyenberg, Public domain, via Wikimedia Commons.