Pseudocyclammina sarvakensis Schlagintweit & Yazdi-Moghadam, 2023

SIMMONS, MICHAEL & BIDGOOD, MICHAEL, 2023, “ Larger ” Benthic Foraminifera Of The Cenomanian. A Review Of The Identity And The Stratigraphic And Palaeogeographic Distribution Of Non-Fusiform Planispiral (Or Near-Planispiral) Forms, Acta Palaeontologica Romaniae 19 (2), pp. 39-169 : 84-86

Pseudocyclammina sarvakensis Schlagintweit & Yazdi-Moghadam, 2023

Reference Illustration & Description

Schlagintweit & Yazdi-Moghadam (2023), Fig. 4 a-g, p. 7.

A very recently described new species from the Sarvak Formation of the Iranian Zagros, P. sarvakensis is distinguished from all previously described Pseudocyclammina species by the relatively larger number of chambers (14- 16) in the final whorl. It has been sometimes conflated with P. rugosa in the Cenomanian literature (the only other Cenomanian pseudocyclamminid), but Schlagintweit & Yazdi-Moghadam’s (2023) illustrated, and newlydescribed material provides clear reason for separation. It is also smaller than P. rugosa (max diameter 1.35mm cf. 3.1-3.8mm) and no specimen of P. sarvakensis has so far been observed to uncoil. See the Species Key Chart (Appendix) for diagnostic and other characteristics.

These authors consider occurrences recorded elsewhere in the Iranian Zagros by Sampò (1969) (as Cyclammina sp. ), and by Omidi et al. (2018) and Esfandyari et al. (2023) (as P. rugosa ) to be P. sarvakensis .

Stratigraphic Distribution

Middle - late Cenomanian.

Schlagintweit & Yazdi-Moghadam (2023) recorded P. sarvakensis from the lowermost part of their middle – late Cenomanian interval of the Sarvak Formation of SW Iran. Omidi et al.’s (2018) records of P. rugosa (= P. sarvakensis see above) come from the mid – upper parts of their Cenomanian interval. Esfandyari et al. (2023) recorded P. rugose (sic) (= P. sarvakensis see above) from the Sarvak Formation but with no age indication given.

Cenomanian Paleogeographic Distribution

Eastern Neotethys.

All confirmed occurrences occur in the Zagros region of Iran only (see references above).

Figures

Fig. 4 Distribution map of type descriptions/specimens in this study.