Granorotalia Benedetti, Di Carlo & Pignatti 2011
Creators: name: Deveciler, Ali
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Chromista
Foraminifera
Globothalamea
Rotaliida
Calcarinidae
Granorotalia

description: Genus Granorotalia Benedetti, Di Carlo & Pignatti, 2011
Granorotalia Benedetti, Di Carlo & Pignatti, 2011: 710. — Benedetti, Di Carlo & Pignatti in Sirel & Deveciler 2017: 70.
Neorotalia Bermúdez in Hottinger, 2014: 154.
TYPE SPECIES. — Granorotalia sublobata Benedetti, Di Carlo & Pignatti, 2011 by monotypy.
DESCRIPTION
Test is asymmetric biconvex, much swollen and ornamented on ventral side (Figs 4K, M; 6C, D; 7C, E; Benedetti et al. 2011: figs 14b 2, e 2, g). Test surface is covered by coarse beads and small papillas on both dorsal and ventral side (Figs 4 I-M; 6B-D; 7C-E; Benedetti et al. 2011: figs 14a-g). Small pseudospines may appear at the periphery (Figs 6C, E, J, K; 7D, F, G, J, L; Benedetti et al. 2011: fig. 11a, figs 13d-e). Chambers are arranged involute low trochospiral and may become evolute at the last whorl on the dorsal side (Figs 4I, L; 6B, E, M; 7F, J, L, N; Benedetti et al. 2011: figs 11a, c, 14b 1, e 1). Sutures on the last whorl are slightly depressed and generate interlocular space leading to a simple intraseptal canal (Figs 6A, H; 7A, G, I, O; Benedetti et al. 2011: figs 11b, d-e). Solid pillars are pierced by vertical canals (funnels) (Figs 6 E-G, I-N; 7B, F, H, J-N; Benedetti et al. 2011: figs 11a, c, 13a-f). Tooth plate covers the base of the chamber lumen, also it produces spiral canal (Figs 6H; 7I). Wall calcareous, perforate and lamellar in pillars, aperture interiomarginal. Connection between chambers is provided by single intercameral foramina (Fig. 6H).
DISCUSSION
Granorotalia is a simple rotaliid with asymmetric biconvex test, granulated surface on both dorsal and ventral side, small pseudospines emerging from the periphery. It was first described by Benedetti et. al. (2011) with Ornatorotalia (type species: O. spinosa Benedetti, Di Carlo & Pignatti, 2011 [Benedetti et al. 2011: 705]; Fig. 4G, H) from Cuisian deposits of Monte Bosco formation. Both are common in some generic charateristics, yet Ornatorotalia has spines with spinal canals (only see in O. spinosa), well developed radial and bifurcate intraseptal canals connected to the marginal openings (canal orifices) (Benedetti et al. 2011: figs 4.g-h, 7.a 1-2 -d; Sirel & Deveciler 2017: 69-70, figs 5A, C, pl. 2, figs 4-7, 9, 11, pl. 3, figs 1, 5). Also it differs from Neorotalia Bermúdez, 1952 (type species: Rotalia mexicana Nuttall, 1928, synonym of? Rotalia burdigalesis d’Orbigny, 1852 in Hayward et al. 2022; Fig. 4 A-C) and Pararotalia Le Calvez, 1949 species (type species: Pararotalia inermis (Terquem, 1882) in Le Calvez [1949: 32]; Fig. 4 D-F) by having granules (papillas and beads) on both dorsal and ventral sides.
Hayward et al. (2024) have transferred Granorotalia and Ornatorotalia to Pararotaliinae subfamily under Calcarinidae family. Calcarinidae mostly represents well-developed canaliculated spine bearing taxa with elaborated canal system (Loeblich & Tappan 1987; Holzmann & Pawlowski 2017). Granorotalia and Ornatorotalia can be related to Calcarinidae for having pustulated surface, true spine with canals or hallow pseudospines, pillars pierced by funnels, spiral and interseptal canals, but they are different from the members of Pararotalinae due to their generic elements. Therefore, Ornatorotaliinae subfamily has been adopted for low trochospiral coiling with coarse pustules, and the other mentioned characteristics.
description: Published as part of Deveciler, Ali, 2025, Biostratigraphic revision and systematic discussion of Granorotalia sublobata Benedetti, Di Carlo & Pignatti, 2011, pp. 327-341 in Geodiversitas 47 (7) on pages 330-331, DOI: 10.5252/geodiversitas2025v47a7, http://zenodo.org/record/15187945