Penarchaias Hottinger, 2007

Gedik, Fatma, 2017, First record of the new Neoplanorbulinid species (Foraminifera) from the Early Oligocene in Turkey, Malatya Basin, Eastern Taurids, Geodiversitas 39 (2), pp. 273-284 : 282

Genus Penarchaias Hottinger, 2007

TYPE SPECIES. — Peneroplis glynnjonesi Henson, 1950 by original designation.

Penarchaias glynnjonesi ( Henson, 1950) ( Fig. 6Q, R)

Peneroplis glynnjonesi Henson, 1950: 35 , pl. 9, figs 8, 9.

Peneroplis aff. glynnjonesi – Sirel 2004: 36, pl. 35, figs 2, 3, 5, 10.

Penarchaias glynnjonesi – Hottinger 2007: 11, 12, pl. 1, fig. 3; pl. 6, figs 2, 10; pl. 7, figs 7, 8; pl. 8, figs 6, 10; pl. 9, figs 6; pl. 12, figs 2; pl. 13, figs 3; pl. 14, figs 13; pl. 15, figs 1-5, 9.

DESCRIPTION

Only megalospheric form is observed. The test is lenticular, its diameter 0.9 mm in early stage, while in adult forms the diameter and the thickness of the test ranges from 1.31 to 1.36 mm and 0.47 to 0.52 mm, respectively. Spheric megalosphere is followed by planispiral early chambers, and later chambers become uniserial. Interior skeletal apertures are observed on the septum ( Hottinger 2007: pl. 7, figs 7, 9). These apertures, which are one of the most important characteristics of the genus, are well observed in Figure 6R, S.