Abstract
The bivalves Pinna sp. cf. cretacea (Schlotheim, 1813) and Pinna cretacea cretacea (Schlotheim, 1813) are systematically described for the first time from the ammonite-constrained upper Barremian (Lower Cretaceous) strata of the Kopet-Dagh Basin, northeastern Iran. This is also, the first record of the Family Pinnidae from the Kopet-Dagh Basin. The specimens were collected from the basal part of the Sarcheshmeh Formation, exposed in the Bojnurd city, North Khorasan province. Additionally, this study includes observations on predation scars (such as scalloped, embayed, and cleft scars), and encrustations by orbitolinids on the Pinna samples. Insights into the contemporary paleoenvironment, characterized by quiet and shallow waters with a soft, muddy substrate, are also discussed.
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