The story
Named after American paleontologists Philip Signor and Jere Lipps, who formally proposed it in 1982.
Etymology from Wiktionary, CC BY-SA 4.0.
Signor-Lipps effect
Today it means: The principle that due to the incompleteness of the fossil record, the earliest and latest known occurrences of a taxon will almost never represent the ages of the actual earliest and latest organisms belonging to it. Full definition →