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Fig. 21 | Swiss Journal of Palaeontology

Fig. 21

From: Multiple Orbitoides d’Orbigny lineages in the Maastrichtian? Data from the Central Sakarya Basin (Turkey) and Arabian Platform successions (Southeastern Turkey and Oman)

Fig. 21

Comparison of the axial and near axial sections of the upper Campanian Orbitoides medius from the Qahlah Formation from Oman (a–f) and O. pamiri from the upper Maastrichtian Taraklı Formation (h–j). An equatorial section of O. medius is shown in (g). Line drawings of the embryonic-nepionic stages of some O. medius specimens are also illustrated. Note that specimens from the Qahlah Formation are invariably biconvex and consist of numerous cycles of lateral chamberlets, whereas those from the Taraklı Formation (O. pamiri) are flat to biconcave with few cycles of lateral chamberlets. Refer to Kayğılı et al. (2021) for the detailed description of O. medius from Qahlah Formation. a B6-10. b B6-20. c B6-11. d B6-14. e B6-22. f B6-19, g B8-8. h EPB5-5. i EPB5-2. j EPB5-20

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