Maastrichtian Larger Benthic Foraminifera From The Arabian Plate Sensu Lato: New Data From Somalia, Turkey, And Iran Author Schlagintweit, Felix text Acta Palaeontologica Romaniae 2020 2020-05-18 16 2 69 83 http://dx.doi.org/10.35463/j.apr.2020.02.03 journal article 10.35463/j.apr.2020.02.03 1842-371x 12583430 Accordiella ? tarburensis Schlagintweit & Rashidi 2016 Fig. 3a–b *2016 Accordiella ? tarburensis n. sp. – Schlagintweit and Rashidi, p. 54, fig. 5a pars, 6–7, 8 pars (late Maastrichtian Tarbur Formation of Iran ). Fig. 2 Above: Subdivison of the Maastrichtian stage: comparison of different used substages and biostratigraphic use of selected larger benthic foraminifera. Examples: Loftusia minor (acc. to Meriç and Görmüş, 2001 ), Siderolitidae (acc. to Robles-Salcedo et al., 2018 , 2019 ), and relationship to biozonation of Wynd (1965) (modified herein). Below: Example of the Palaeoelphidium multiscissuratum subzone (new name) of the Omphalocyclus-Loftusia assemblage zone sensu Wynd (1965) , upper Maastrichtian Tarbur Formation, SW Iran. Loftusia sp. in the middle with agglutinated test of Palaeoelphidium multiscissuratum (Smout) (detail from Luger, 2018, pl. 26, fig. 10, illustrated as Laffiteina aff. jaskii Rahaghi), and Omphalocyclus ( O ). Table 1 Distribution of the Maastrichtian (mostly larger) benthic foraminifera treated in the present compilation (for references see synonymy for each taxon).
Formation, area Taxa Auradu Fm Somalia Simsima Fm. Qatar Tarbur Fm. SW Iran Garzan or equivalent Fm. SE Turkey
Accordiella ? tarburensis X X
Antalyna korayi X X X
Broeckinella arabica X X X
Broeckinella grandis X
Canalispina iapygia X X
Cyclopsinella steinmanni X X X
Dictyoconella ? minima X X
Dictyoconella complanata ? X X
Dictyoconus bahktiari X X X
Gen. et sp. indet. X X X
Gyroconulina columellifera X X X
Palaeoelphidium multiscis- surata X X X
Pseudedomia hamaouii X X X
Pseudorbitolina schroederi X X X X
2018 Dukhania ? cherchii n. sp. – Luger, p. 88, pl. 13, 6– 7, non 9 (= Gyroconulina columellifera ), 10-11 (late Maastrichtian Auradu Formation of Somalia ).
Remarks: From the lower Auradu Formation, Luger (2018) established a new species as Dukhania ? cherchii ( Fig. 3b ), that is considered a junior synonym of Accordiella ? tarburensis ( Fig. 3a ). The maximum test height is up to 1.8 mm for the Somali, and up to 1.4 mm for the Iranian specimens. In both cases, the generic identity of the described species was indicated with some doubts ( Accordiella Farinacci , family Pfenderinidae : triserial, with endoskeletal plates and pillars; Dukhania Henson , family Chrysalidinidae : triserial becoming biserial, with endokeletal pillars, see Loeblich and Tappan 1988). Because of its marginally strongly overlapping chambers, and the extensive endoskeleton consisting of numerous pillars, Dukhania indeed seems to be closer to the Maastrichtian forms than Accordiella . For the moment being the name of the validly described taxon Accordiella ? tarburensis is maintained. Last but not least, some axial sections of Gyroconulina columellifera Schroeder & Darmoian (see also below) show similarities ( Fig. 3d ). The marginal part of the chambers in the latter however displays subdivisions (exoskeleton).