Pseudopeneroplis oyonensis Consorti et al., 2018

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 : 129

Pseudopeneroplis oyonensis Consorti et al., 2018

Reference Illustration & Description

Consorti et al. (2018), Figs. 5-6, p. 6-10 .

Pseudopeneroplis oyonensis is an apparently endemic species at present only known from the coastline of the Eastern Pacific, specifically Peru. Consorti et al. (2018) assigned the genus to the Praerhapydioninidae.

Pseudopeneroplis has the same chamber/coiling arrangement as Peneroplis Montfort , but develops short, thick subdivisions (septula) in the chamber margins. Pseudopeneroplis has a single row of rounded openings in the middle of the apertural face (and which are aligned between chambers) whereas Pseudorhipidionina has two rows of apertures and longer septula which sometimes bifurcate. Both genera lack pillars. See the Species Key Chart (Appendix) for diagnostic and other characteristics. Pseudorhapydionina and Praetaberina have more cylindrical uncoiled portions, and with septula arranged more radially rather than linearly in Pseudopeneroplis . Praetaberina also possesses central pillars which Pseudopeneroplis does not. In equatorial sections Pseudopeneroplis also resembles Scandonea (especially S.? phoenissa when uncoiled) but the latter genus lacks septula.

Consorti et al. (2018) mention that, despite whether a specimen is megalospheric or microspheric, the dimensions of the overall shell are unaffected (up to 0.52mm equatorial diameter and maximum length of uncoiled specimen c. 1.00mm).

Stratigraphic Distribution

Late Cenomanian.

The type locality is the Jumasha 4 unit, Uchucchacua section, Peru, dated as late Cenomanian using Carbon-isotope stratigraphy ( Navarro-Ramirez et al., 2017) .

Cenomanian Paleogeographic Distribution

Eastern Pacific.

Recorded from Peru only (on the Western Platform of South America).

Figures

Fig. 5 Representative illustrations of Biconcava bentori: a Equatorial section, Hamaoui & Saint Marc (1970, pl. 21, fig. 1, Israel); b Axial section, Hamaoui in Schroeder & Neumann (1985, pl. 13, fig. 3, Lebanon).

Fig. 6 Cenomanian paleogeographic distribution of Biconcava bentori

Fig. 7 Representative illustrations of Daxia cenomana: a Equatorial section, Arnaud-Vanneau & Prestat in Schroeder & Neumann (1985, pl. 1, fig. 2, France); b Axial section, Arnaud-Vanneau & Prestat in Schroeder & Neumann (1985, pl. 1, fig.7, France).

Fig. 8 Cenomanian paleogeographic distribution of Daxia cenomana.

Fig. 9 Representative illustrations of Deuterospira pseudodaxia: a Equatorial section, Hamaoui (1979, fig. 2a, Israel); b Axial section, Hamaoui (1979, fig. 2b, Israel).

Fig. 10 Cenomanian paleogeographic distribution of Deuterospira pseudodaxia