Holotype MUSM 3580 is a partial skeleton from the middle Eocene Yumaque Member of coastal Peru; its sacral attachment, robust limbs and hoof-like phalanges document a quadrupedal whale with both aquatic and weight-bearing anatomical signals.
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Peregocetus pacificus is anchored by holotype MUSM 3580 in the lowest Yumaque Member of Peru at an interpreted approximately 42.6 Ma; the value is nannofossil biochronology, not a direct specimen date, genus-wide duration or global first appearance.
claim:taxon:peregocetus:fossil-rangeLambert et al. establish Peregocetus pacificus gen. et sp. nov. from holotype MUSM 3580 and place it within the paraphyletic Protocetidae in their morphology matrix; that placement is analysis-dependent and not a direct-ancestry claim.
claim:taxon:peregocetus:taxonomyPeregocetus holotype MUSM 3580 is bounded to Playa Media Luna in the Pisco Basin, Peru, at 1.95 m above the base of the Yumaque Member of the Paracas Formation; the paper's westward South Atlantic route is a reconstructed dispersal hypothesis, not an observed track.
claim:taxon:peregocetus:biogeographyPeregocetus preserves anatomy used to reconstruct both aquatic swimming and terrestrial weight bearing, including robust limbs and hoof-like phalanges; feeding, gait, swimming performance and habitat behaviour remain inferred rather than directly observed.
claim:taxon:peregocetus:ecologyHolotype MUSM 3580 preserves mandibles and most major postcranial regions, including two fused sacrals, a defined femoral head, robust limbs and hoof-like distal phalanges; the articulated presentation includes reconstructed or missing portions.
claim:taxon:peregocetus:morphology