Biostratigraphical observations in different locations and horizons of carbonate strata from four oil wells drilled in the Persian Gulf Basin document three new ichnospecies of crustacean microcoprolites. Favreina irannensis n. sp. occurs in Valanginian–Hauterivian strata of the Buwaib Formation (Gadvan Formation), Palaxius asmariensis n. sp. in the Lower Miocene strata of the Asmari Formation, and Palaxius minaensis n. sp. in the Aptian strata of the Dariyan Formation.