Pseudexomilus caelatus is an extinct species of marine gastropod mollusc in the family Horaiclavidae. Fossils of the species date to the middle Miocene, and are found in the St Vincent Basin of South Australia.
In the original description, Powell described the species' as follows:
The holotype of the species measures in height and in diameter.
P. caelatus was first described by A.W.B. Powell in 1944, who named it the type species of the genus Pseudexomilus. The holotype was collected by W. Howchin and J. C. Verco in 1919 from the Metropolitan Abattoirs Bore in Adelaide, Australia, and is held by the Auckland War Memorial Museum.
This extinct marine species occurs in middle Miocene (Bairnsdalian) strata of the lower Dry Creek Sand, of the St Vincent Basin at a depth of between , in Adelaide, South Australia.