Abstract: The changes of Orbitoides parameters, particularly internal ones, within time and place are controversial. This study examinesthe matter with Orbitoides examples from various localities of Turkey (Hekimhan, Darende-Malatya; Adıyaman; Pazarcık-KMaraş;Osmaneli-Bilecik). Biometrical analyses of more than 1250 specimens of the Orbitoides species particularly from the Early to Middle Maastrichtian of Turkey indicate that environmental factors affected the test shape, embryo size, the number of both auxiliary andperi-ebriyonic chamberlets. The effects of depth, substrate and changes related to time were discussed.