ACTA PALAEONTOLOGICA ROMANIAE
Acta Palaeontologica Romaniae, Vol. 13 (1) 2017 - Online Articles
PRINT ISSN 1842-371x
& KOOROSH RASHIDI
Abstract A new larger benthic foraminifera, Zagrosella rigaudii n.gen., n.sp., is described from the Late Maastrichtian of the Tarbur Formation of the Zagros Zone, SW Iran. The new taxon represents almost a homeomorph to the Early Jurassic Biokovina gradacensis
. The wall structure of Zagrosella n.gen. appears more evolved with larger parapores whereas in Biokovina these are thinner, and bifurcating. There are also differences in the endoskeletal structures, being more massive (in the central part of the test) and may fuse in Biokovina whereas in Zagrosella they occur preferentially on the sides of the chambers, and never fused. Zagrosella rigaudii n.gen., n.sp. represents one of the youngest representatives of the Biokovinoidea, a group that became extinct at the Cretaceous-Paleogene boundary.
& KOOROSH RASHIDI
Abstract A new larger benthic foraminifera, Persiacyclammina maastrichtiana n. gen., n. sp., is described from the Late Maastrichtian of the Tarbur Formation of the Zagros Zone, SW Iran. The predominantly planispiral-involute taxon, with ammobaculitoid (uncoiled) final part, is characterized by a wall made of a thin imperforate outer layer (epidermis), a fine subepidermal alveolar middle layer and a coarser inner network formed by beams and rafters. Pseudotriangular shaped vertical partitions (septula) extend into the chamber interior downward to the chamber floor where they alternate with intercameral foramina at the margin of the cribrate perforated central area. The new taxon occurs in diverse foraminiferal wackestone-packstone microfacies, together with larger benthic foraminifera (Dicyclina, Dictyoconus, Loftusia, Neobalkhania, Omphalocyclus, Tarburina, Zagrosella), rudist debris and dasycladalean algae (Pseudocymopolia, Salpingoporella).