Paratrochamminoides olszewskii ( Grzybowski, 1898 )

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 : 32

Paratrochamminoides olszewskii ( Grzybowski, 1898)

Figure 17.9

1898 Trochammina olszewskii ; Grzybowski, p. 298,

pl. 11, fig. 6. 2005 Paratrochamminoides olszewskii (Grzybowski) ; Kaminski and Gradstein, p. 305, pl.

64, figs. 1-7. Material. Five specimens from five samples. Description. Test free, oval in outline, glomospirine-like coiled, 2–3 whorls are externally visible. The initial stage is undivided, going on with the ontogeny some constrictions define the chambers. The last whorl tends to become planispiral or weakly irregular. Wall thin, finely agglutinated. Distribution. Cenomanian–Eocene ( Kaminski and Gradstein, 2005).

Figures

FIGURE 17. Scanning electron micrographs of Lituotubidae (1-3, 7, 9, 11-12) and Trochamminoidae (4-6, 8, 10) from the Caltavuturo Formation cropping out at Portella Colla. 1-2, Paratrochamminoides heteromorphus (Grzybowski, 1898), MM12 (1) and MM14 (2). 3, Conglophragmium irregulare (White, 1928), PCs0. 4, Trochamminoides coronatus (Brady, 1879), MM14. 5, Trochamminoides grzybowskii Kaminski and Geroch, 1992, MM1. 6, Trochamminoides subcoronatus (Grzybowski, 1896), MM1. 7, Paratrochamminoides cf. olszewskii (Grzybowski, 1898), PC060615. 8, Trochamminoides dubius (Grzybowski, 1901), PC060611. 9, Paratrochamminoides olszewskii (Grzybowski, 1898), PC11. 10, Trochamminoides dubius (Grzybowski, 1901), PC060611. 11, Paratrochamminoides aff. olszewskii (Grzybowski, 1898), PC060615. 12, Paratrochamminoides aff. gorayskii (Grzybowski, 1898), PC060615. Scale bars equal 0.5 mm.