Holotype: BMNH 40676

Locality: Swanage, Dorset County, England, Southern United Kingdom.

Horizon: Purbeck.

Biostratigraphy:

Age: Uppermost Tithonian Stage, Uppermost Malm Epoch, Late Jurassic- Berriasian Stage, Lowermost Neocomian Substage, Lowermost Early Cretaceous Epoch, Early Cretaceous.

Material: Carapace lacking all peripherals except the 1st and 2nd on the left and the 1st on the right.

Referred material:

L. 7017: Shell.

L. 9520: Shell.