Placentammina placenta ( Grzybowski, 1898 ), 1960

Benedetti, A, 2017, Eocene / Oligocene deep-water agglutinated foraminifers (DWAF) assemblages from the Madonie Mountains (Sicily, Southern Italy), Palaeontologia Electronica 20 (1), pp. 1-66 : 20

Placentammina placenta ( Grzybowski, 1898)

Figure 12.16

1898 Reophax placenta ; Grzybowski, p. 276, pl. 10, figs. 9, 10.

1943 Placentammina placenta ; Majzon, p. 152, pl. 3, fig. 7a-c.

1954 Saccammina placenta (Grzybowski) ; Geroch and Gradzinski, p. 36.

1960 Saccammina placenta (Grzybowski) ; Geroch, p. 121, pl. 2, figs. 1-6.

1987 Placentammina placenta (Grzybowski) ; Loeblich and Tappan, p. 31, 32, pl. 21, figs. 12-19.

2005 Placentammina placenta (Grzybowski) emend. Geroch, 1960 ; Kaminski and Gradstein, p. 136, pl. 11, figs. 1-6.

Material. 11 specimens from eight samples

Description. Test medium size, single chamber circular in outline and compressed in both the sides. Wall composed of quartz grains of different size. Aperture small and circular on a raised neck in more or less eccentric position.

Distribution. Common in flysch-type deposits from the Late Cretaceous to the Eocene of Carpathians;

signaled in the Oligo-Miocene flysches of Mediterranean areas.

Figures

FIGURE 12. Scanning electron micrographs of Astrorhizida (1-13) and Saccamminidae (14-15) foraminifers from the Caltavuturo Formation cropping out at Portella Colla. 1-2, Rhabdammina discreta Brady, 1884, PCs0 (1) and PC060618 (2). 3, Rhabdammina eocenica Cushman and Hanna, 1927, PC060601. 4-5, Psammosiphonella cylindrica (Glaessner, 1937), PC11 (4) and PCs0 (5). 6-7, Psammosiphonella linearis (Brady, 1879), PC060618 (6) and PC11 (7). 8, Bathysiphon sp., MM12. 9, Nothia excelsa (Grzybowski, 1898), PC060603. 10, Nothia robusta (Grzybowski, 1898) with Ammolagena clavata (Jones and Parker, 1860), PC060621. 11, Nothia cf. latissima (Grzybowski, 1898), PC060624. 12-13, Rhizammina indivisa Brady, 1884, PC060621. 14-15, Psammosphaera irregularis (Grzybowski, 1896), PC13 (14) and PC22 (15). 16, Placentammna placenta (Grzybowski, 1898), PCs0. 17, Saccammina grzybowskii (Schubert, 1902), PC060621. Scale bar equals 0.5 mm.