Signor-Lipps effect

== English == === Etymology === Named after American paleontologists Philip Signor and Jere Lipps, who formally proposed it in 1982. === Noun === Signor-Lipps effect (paleontology) 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.