Dictyoconella complanata Henson, 1948

Schlagintweit, Felix, 2020, Maastrichtian Larger Benthic Foraminifera From The Arabian Plate Sensu Lato: New Data From Somalia, Turkey, And Iran, Acta Palaeontologica Romaniae 16 (2), pp. 69-83 : 75

Dictyoconella complanata Henson, 1948

Fig. 5d–f

*1948 Dictyoconella complanata n. gen., n. sp. – Henson, p. 25, pl. 6, figs. 2-3, 16, pl. 10, fig. 14 (Maastrichtian Simsima Fm. of Qatar).

2004 Dicyclina schlumbergeri, Dictyconella sp. – Khosrow Tehrani and Afghah, pl. 2, figs. 4, 10 (Maastrichtian Tarbur Fm. of Iran).

? 2014 Antalyna korayi Farinacci & Köylüoğlu – Afghah and Yaghmour,pl. 2, fig. 5 (Maastrichtian Tarbur Fm. of Iran).

Remarks: In his important monograph on Mesozoic- Cenozoic Larger Benthic Foraminifera from the area of the Middle East-South-Western Asia, Henson (1948) erected the genus Dictyconella for more or less "compressed-conical" dictyoconids including the two species D. complanata and D. minima . Both are however structurally completely different and cannot be assigned to the same genus (see Schlagintweit et al., 2016b). A revision is currently under preparation. The type-species D. complanata was described from Maastrichtian carbonates of the Simsima Formation of Dukhan No. 1 well of Qatar. Henson (1948, p. 24–25) noted the presence of a “zone with undivided chamber space” (or marginal ridge) between the marginal (with exoskeleton) and central zones (with endoskeleton; see also Hottinger, 2006, p. 22) as described also from Dictyoconus Blanckenhorn by Davies (1938: marginal trough, see Fig. 4 d-e). There is reference that indicate the presence of D. complanata in the Garzan Formation of SE Turkey ( Çoruh et al., 1997), but real evidence is lacking so far.

Figures

Fig. 5 Cyclopsinella steinmanni (Munier-Chalmas) from the upper Maastrichtian of Somalia (Auradu Formation: a), Iran (Tarbur Formation: b-c, e-f), and C. steinmanni from the upper Santonian of France (d). a from Luger (2018, pl. 4, fig. 10 as Saudia sp.). b-c, e-f Naghan section. Note the aligned pillars (partly fusing laterally) in b and f, and sporadic rudimentary short rafter (r) in e. d from Gendrot (1964, pl. 1, fig. 10). Abbreviations: pi = pillar, r = rafter, s = septum.

Fig. 4 Larger benthic foraminifera from the Maastrichtian of Iran (Tarbur Fm.: a-b, d, f), Turkey (Garzan Fm.: c), Qatar (Simsima Formation: e). a-c Canalispina iapygia Robles-Salcedo et al. (a-b, Fasa section; c from Çoruh et al., 1997, pl. 76, fig. 3 as Siderolites calcitrapoides). d-f Dictyoconella complanata Henson (d, f Naghan section, e from Henson, 1948, pl. 10, fig. 14). T = Tarburina zagrosiana Schlagintweit & Rashidi in f. m.t. = marginal trough in e and d.