Trochamminoides dubius ( Grzybowski, 1901 )

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 : 33

Trochamminoides dubius ( Grzybowski, 1901)

Figure 17.8 , 10

1901 Ammodiscus dubius ; Grzybowski, p. 274, pl. 8, figs. 12, 14.

1993 Trochamminoides dubius (Grzybowski) ; Kaminski and Geroch, p. 275, pl. 15, figs. 9- 12.

2005 Trochamminoides dubius (Grzybowski) ; Kaminski and Gradstein, p. 308, pl. 65, figs. 1- 8.

Material. 10 specimens in six samples.

Description. Test free, small, compressed. Initial coil glomospirine-like, becoming planispiral through the ontogeny. The test is composed of four whorls, in the last whorl 4 ½ tubular chambers occur. Wall finely agglutinated.

Distribution. Maastrichtian–Oligocene ( Kaminski and Gradstein, 2005).

Figures

FIGURE 10. Depth distribution of some selected and frequent taxa according to data presented by van Morkhoven et al. (1986), Kaminski and Gradstein (2005) and Waśkowa (2014).

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.