Phylum: Mollusca

Class: Bivalvia

Order: Pterioida

Family: Ostreidae

Genus: Ostrea

Species: irregularis

Lithostratigraphy: Jurassic, Lias, Lower

Locality: Bitton, South Gloucestershire, United Kingdom of Great Britain and Northern Ireland (UK) / England, Northern Europe, Europe

Precise Location: Bitton