Biostratigraphic utility of species of the genus Orbitoides

On the Occurrence of Primitive Orbitoides Species in Gavrovo – Tripolitza Platform (Mainalon Mountain, Peloponnesus, Greece)

“…Therefore, it is fairly impossible to obtain sections perfectly in the median layer due to the fact that the test is rarely flat. This lead to different interpretations of the arrangement of the equatorial chambers especially in the nepionic stage of growth (Neumann 1987;Caus et al 1996) and as a consequence to a different general and specific attribution of the specimens. The spherical protoconque is followed by a deuteroconque of the same size.…”

“…According to Drooger & Klerk (1985), the biserial or spiral initial stage of O. hottingeri reminds that of the microspheric specimens of all later Orbitoides and Omphalocyclus. According to Caus et al (1996) the adult chambers have the same size as the nepionic ones. O. hottingeri has no lateral chamberlets, but the outer lamella covering the previously exposed shell thickens the lateral wall (Caus et al 1996).…”

Paleoecology & Paleobiogeography of Orbitoides Genus in Zagros Basin (South West Iran)

“…In the Late Cretaceous Orbitoides is interpreted to have lived in "deeper environments" [18] in the upper photic zone at depths of about 40-80 m [19]. The environment is mostly interpreted as being open marine with some terrigenous input [4,20]. The morphology (thick lenticular test, presence of lateral chambers) indicates a habitat in high energetic environments, which is supported by the presence of Siderolites [4].…”

“…This genus is distributed in Caribbean Faunal Province between North America and Venezuela, Tethys and also India and Philippines. Amongst these countries Iran [22][23][24][25][26], Algeria [20,27], Turkey [28,29]. The genus Orbitoides displays some of the widest latitudinal and longitudinal extensions among the larger Upper Cretaceous foraminifera.…”

“…In paleofacies map Zigler, 2001 ( Figure 6) we can see that Amiran clastic sediment is extension in Lorestan and High Zagros. Because the growth of orbitoides species occurs in an environment with poor entrance of clastic sediments [20,27,38].…”