Bartoncetus is a genus of extinct archaeocete ceteceans belonging to the Basilosauridae that is known from the Middle Eocene of Europe.
Taxonomy In 1876, Harry Seeley described a skull found in the Wanklyn's Barton Cliff in the United Kingdom as a new species of Zeuglodon, Z. wanklyni. This specimen, however, went missing after its description, but Z. wanklyni was referred to as Zygorhiza wanklyni by Kellogg (1936) or to as a nomen dubium. In 2022, Gingerich and colleagues suggested that the lost skull possibly belongs to Pachycetus. Van Vliet et al. (2026) redescribed the taxon as a new genus of dorudontine basilosaurid, Bartoncetus, based on a postcranial specimen and Seeley's description of the holotype skull.
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