First report of Albian–Cenomanian ichthyological microremains from the Kazhdumi Formation Fars Province, Zagros Basin, South Iran.

Vertebrate remains are scarce in the Cretaceous of Iran, with only a few records of fishes and one genus of chelonioid turtle known from the Dariyan and Sarvak formations. Here, we describe for the first time the paleoichthyological fauna of the Kazhdumi Formation, based on disarticulated microremains that represent the first record of vertebrates in the unit, highlighting this novel Albian–Cenomanian fossil assemblage. The fauna is composed of lamniform (cf. <italic>Dallasiella</italic> sp., cf. <italic>Paranomotodon</italic> sp., Anacoracidae indet., cf. <italic>Haimirichia amonensis</italic>, cf. <italic>Scapanorhynchus</italic>, Lamniformes indet.) sharks and pycnodontiforms Osteichthyes. [ABSTRACT FROM AUTHOR]