Orbitolinids And Other Larger Benthic Foraminifera From The Aptian-Albian Of Tibet: Critical Discussion Of Some Recently Published Data Author SCHLAGINTWEIT, FELIX Lerchenauerstr. 167, 80935 Munich, Germany felix.schlagintweit@gmx.de text Acta Palaeontologica Romaniae 2021 2021-09-09 18 1 17 23 http://dx.doi.org/10.35463/j.apr.2022.01.03 journal article 10.35463/j.apr.2022.01.03 1842-371x 10520845 Record of Praeorbitolina cormyi Schroeder, 1964 and Praeorbitolina wienandsi Schroeder, 1964 ( Fig. 2 A-B, E) Referred illustrations: Praeorbitolina cormyi , figures 9.3 to 9.7 in BouDagher-Fadel et al. (2017) . Praeorbitolina cf. wienandsi , figure 12.1 in BouDagher-Fadel et al. (2017) . The specimens of P. cormyi illustrated by BouDagher-Fadel et al. (2017) are low-conical with test diameter of up to 2.3 mm ( Fig. 2 A-B). Although no detail of the embryo is provided, in my opinion, it is well discernible that a subapical simple embryo of one or two chambers (= protoconch and deuteroconch or first postembryonic chamber) that lacks a subembryonic zone is present. Such an embryo type is reported from the dictyoconid Paleodictyoconus actinostoma Arnaud-Vanneau & Schroeder. Examples of comparable specimens from the early Aptian of Iran are shown in Figure 2 C-D. The adult specimens illustrated by BouDagher-Fadel et al. (2017 , fig. 9.5 and 9.6) show a low conico-concave test morphology (e.g., Henson, 1948 , fig. 12i) typical for P. actinostoma . This morphology results from sigmoseptal (in cases annular) adult chambers leading to a striking central depression at the cone base ( Arnaud-Vanneau & Schroeder, 1976 ; Clavel in Granier et al, 2013 , 2017 ). The principal occurrence of Praeorbitolina cormyi in lower Aptian limestones of the Tibetian area is well recorded (e.g., Zhang, 1991 ) but, in my opinion the specimens illustrated by BouDagher-Fadel et al. (2017) do not belong to this species. The specimen of Praeorbitolina cf. wienandsi ( BouDagher-Fadel et al., 2017 , fig. 12.1) shows a biloculine embryo (protoconch and deuteroconch) lacking a subembryonic zone in my opinion ( Fig. 2E ). The specimen from Tibet might belong to Paleodictyoconus sp. (see Fig. 2 F-G for comparison). This conclusion provides a revised basis interpretation for the provided biostratigraphic framework therein.