Paratrochamminoides heteromorphus ( 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 : 29

Paratrochamminoides heteromorphus ( Grzybowski, 1898)

Figure 17.1-2

1898 Trochammina heteromorpha ; Grzybowski, p. 286, pl. 11, fig. 16.

1943 Trochamminoides koeroesmezooensis ; Majzon, p. 156, pl. 2, fig. 16a-c.

2005 Paratrochamminoides heteromorphus (Grzybowski) ; Kaminski and Gradstein, p. 298, pl. 62, figs. 1-10.

Material. 18 specimens from nine samples.

Description. Test free, large, initiallly trocospirally or streptospirally coiled, last chambers uncoiled.

Chambers globose increasing in size in the uncoiled portions, where they become tubular and more or less compressed. Sutures incise. Wall finely agglutinated, smooth surface. Aperture simple at the end of the last chamber.

Distribution. Campanian–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.