Ernst Mayr's 1954 peripatric-speciation model already predicted the fossil record's gaps, two decades before Eldredge and Gould named punctuated equilibrium

Writing in 1954 — eighteen years before Eldredge and Gould coined "punctuated equilibrium" — Ernst Mayr described the paleontological consequence of his peripatric (founder-effect) speciation model directly: "Rapidly evolving peripherally isolated populations may be the place of origin of many evolutionary novelties. Their isolation and comparatively small size may explain phenomena of rapid evolution and lack of documentation in the fossil record, hitherto puzzling to the paleontologist." (Mayr 1954, Summary, p. 179; the primary reprint uses the American spelling "paleontologist.")

The prediction follows from the mechanism. If most morphological change happens fast, in small populations at the geographic edge of a species' range, then that change is unlikely to be captured in the fossil record (few individuals, brief interval, marginal locale); the abundant, well-preserved central population instead records long stability. The "gappiness" that gradualist paleontology treated as missing data is, on Mayr's model, the expected signal. Eldredge and Gould's later contribution was to take this prediction seriously as pattern rather than artifact — see claim-punctuated-equilibrium-derives-from-mayr-peripatric-speciation and claim-punctuated-equilibriums-novel-addition-was-stasis-emphasis.

Quote verified against the primary (2026-07-27). The passage is confirmed near-verbatim on p. 179 of Mayr's 1954 chapter "Change of genetic environment and evolution," in Evolution as a Process (eds. Huxley, Hardy & Ford), read via the Blackwell Publishing verbatim reprint. The only variance is a spelling artifact ("paleontologist" in the reprint vs. "palaeontologist" in the prior Wikipedia wording). The earlier [unverified-quote — needs primary] flag is lifted and the source repointed from Wikipedia (Tier 4) to the primary (Tier 1); see question-verify-biological-punctuated-equilibrium-primaries (now answered). One further point the primary settles: Eldredge and Gould's own 1972 essay does not cite this 1954 chapter for the mechanism it later leaned on — it cites Mayr 1963 — see claim-eldredge-gould-1972-cite-mayr-1963-not-1954-for-genetic-revolution.