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).