Temporal range: 145.5–93.5 Ma Berriasian - Cenomanian
|Ramus of O. minor and O. major|
The type species of Oweniasuchus is O. major from the Early Cretaceous Upper Purbeck Group in Beccles, England. It is known from a mandibular ramus that was first described as Brachydectes minor by Richard Owen in 1879. Because the generic name Brachydectes was preoccupied by a beetle, the species was reassigned to the new genus Oweniasuchus by Arthur Smith Woodward in 1885, along with another species, B. minor, also described by Owen from material from Beccles. Recently, O. major has been considered a nomen dubium because the holotype specimen (BMNH 48304) is too fragmentary to provide an adequate diagnosis. O. minor has since been proposed to be a synonym of the atoposaurid Theriosuchus pusillus. Two other species, O. lusitanicus and O. pulchelus, are known from the Late Cretaceous of Portugal.
- Salisbury, S. W. (2002). "Crocodilians from the Lower Cretaceous (Berriasian) Purbeck Limestone Group of Dorset, southern England". Special Papers in Palaeontology. 68: 121–144.
- Crespo, E. G. (2002). "Paleoherpetofauna Portuguesa". Revista Española de Herpetología. 2002: 17–35.
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