Flabelloperforata tarburensis, Schlagintweit & Rashidi, 2017

Schlagintweit, Felix & Rashidi, Koorosh, 2017, Persiella Pseudolituus N. Gen., N. Sp., And Flabelloperforata Tarburensis N. Gen., N. Sp., Two New Larger Benthic Foraminifera From The Upper Maastrichtian Of Iran, Acta Palaeontologica Romaniae 13 (2), pp. 3-19 : 7

Flabelloperforata tarburensis n.sp.

?2009 Vania anatolica Sirel – Afghah, pl. 1, Fig. 4 .

Figs. 3a–b pars, 6–7.

Origin of the name: The species name refers to the late Cretaceous Tarbur Formation of the Zagros Zone, SW Iran.

Holotype: Oblique section illustrated in Figure 6A , thin-section NG 85-2.

Paratypes: Specimens in Fig. 6b–d, f .

Description: Test large, flattened (to undulating) and flabelliform, with rounded periphery. Initial part with chambers (7–8) continuously increasing in size as added, then rapidly increasing in breadth, becoming flabelliform (but never cyclic). The latter part consists of up to 15 chambers. Chambers without any structures (no exo- and endoskeleton). The chamber sutures are distinctly depressed. Wall and septa equal in thickness. The solid septa are pierced by numerous (multiple) and tiny foramina arranged in several parallel rows (?2 to 3) (e.g. Figs. 6i, k, m ). Wall thin, dark-microgranular-like to finely agglutinated with close-set simple pseudo-keriotheca-like pores ( Fig. 7b ); thin epiderm present, may be decorticated.

Dimensions (in mm):

test diameter = up to 14.5 (incomplete)

test thickness = up to 0.4

thickness septum = 0.02–0.06

diameter foramina = 0.01–0.03

diameter pseudo-keriotheca-like pores = 0.005–0.08

Remarks: See further remarks for the genus as the compared forms are monospecific.

Figures

Fig. 4 Vertical distribution of Persiella pseudolituus n. gen., n. sp. and some other larger benthic foraminifera in the Tarbur Formation of the Mandegan section.

Fig. 3 Typical microfacies of samples with Flabelloperforata tarburensis n. gen., n. sp (F in a–b), and Persiella pseudolituus n. gen., n. sp. (Ps in c–d), from the upper Maastrichtian Tarbur Formation of the Naghan section, Zagros Zone, SW Iran. a–b Wackestones/packstones with benthic foraminifera, among many porcelaneous and agglutinating taxa such as Dicyclina sp. (Di), Tarburina zagrosiana Schlagintweit, Rashidi & Barani (T), Dictyoconus bakhtiari Schlagintweit, Rashidi & Babadipour (D) and remains of dasycladalean algae (d in b). c Wackestone with small and larger benthic foraminifera and oblique longitudinal section of the dasycladale Pseudocymopolia cf. anadyomenea (Elliott) (P). d Grainstone/packstone with Omphalocyclus macroporus Lamarck (O), Dictyoconella? minima Henson (Dic), and slightly oblique axial section of Persiella pseudolituus n. gen., n. sp. (Ps). Thin-sections: 2NG 81-4 (a), 2NG 120 (b), 2NG 166 (c), 2NG 177 (d).

Fig. 6 Flabelloperforata tarburensis n. gen., n. sp. from the upper Maastrichtian of the Tarbur Formation of the Naghan section, Zagros Zone, SW Iran. a–e, g–l: Oblique sections; holotype specimen in a; multiple foramina depicted in i and k with arrows. f Oblique equatorial section. T: Tarburina zagrosiana Schlagintweit, Rashidi & Barani. m Slightly oblique subaxial section. Arrow: multiple foramina. Thin-sections: NG 85-2 (a), 2NG 81-2 (b), 2NG 85-1 (c), 2NG 83 (d), 2NG 84-1 (e, h), NG 49 (f), 2NG 81-4 (g), NG 83-2 (i), NG 81 (j), NG 61 (k), 2NG 87-2 (l), 2NG 197 (m).

Fig. 7 Flabelloperforata tarburensis n. gen., n. sp. from the upper Maastrichtian of the Tarbur Formation of the Naghan section, Zagros Zone, SW Iran. a Oblique section showing multiple foramina. b Detail from a showing pseudo-keriotheka-like wall structure. c Oblique section. d, e Details (d from c) showing multiple foramina. f Oblique section. Thin-sections: 2NG 8 (a–b), 2NG 86 (c–e), 2NGN (f). Scale bars: a–b = 0.2 mm, c, f = 1 mm, d–e = 0.3 mm.