Quadrimorphina laevigata ( Phleger and Parker, 1951 )

Setoyama, Eiichi & Kaminski, Michael A., 2015, Neogene benthic foraminifera from the southern Bering Sea (IODP Expedition 323), Palaeontologia Electronica (International ed. in English) 76 (4), pp. 1-30 : 18

Quadrimorphina laevigata ( Phleger and Parker, 1951)

Figure 7.1a–c

1951 Valvulineria laevigata Phleger and Parker : p. 25, pl. 13, figs. 11, 12.

1982 Quadrimorphina laevigata (Phleger and Parker) ; Matoba and Yamaguchi, p. 1048, pl. 4, fig. 2.

2000 Quadrimorphina laevigata (Phleger and Parker) ; Ohkushi, Thomas and Kawahata, p. 144, pl. 3, fig. 2.

Description. Test small, biconvex, trochospiral, circular, and slightly lobulate in outline, with four chambers in the final whorl. Chambers inflated especially in the final whorl, increasing in size rapidly. Sutures clear, incised, straight to slightly curved backwards on the spiral side, straight and radial on the umbilical side. Wall smooth, finely perforated. Aperture basal, with a large flap that covers the entire umbilicus.

Figures

FIGURE 7. All scale bars are 100 µm. 1. Quadrimorphina laevigata, 13H-3, 146–148 cm; a. dorsal view; b. ventral view; c. edge view. 2. Oridorsalis umbonatus, 3H-CC; a. dorsal view; b. ventral view; c. edge view. 3. Gyroidina? sp. A, 36H-5, 148–150 cm; a. dorsal view; b. ventral view; c. edge view. 4. Gyroidina? sp. A, 36H-CC; a. dorsal view; b. ventral view; c. edge view. 5. Hansenisca sp. A, 9H-3, 146–148 cm; a. dorsal view; b. ventral view; c. edge view showing a basal slit aperture. 6. Hansenisca sp. A, 16H-3, 146–148 cm; a. dorsal view; b. ventral view; c. edge view showing a low arch aperture. 7. Epelistoma sp. A, 63X-3, 146–148 cm, lateral view. 8. Lenticulina sp. A, 26H-5, 147– 149 cm; a. lateral left view; b. edge view. 9. Lenticulina sp. B, 62X-5, 146–148 cm; a. lateral left view; b. edge view. 10. Hemirobulina sp. A, 9H-5, 146–148 cm; a. lateral left view; b. edge view. 11. Reussoolina apiculata, 28H-CC, lateral view. 12. Lagena cf. Lagena tagusensis, 12H-3, 146–148 cm; a. lateral view; b. apertural view. 13. Lagena striata, 10H-3, 146–148 cm; a. lateral view; b. apertural view. 14. Oolina squamosa, 10H-3, 146–148 cm; a. lateral view; b. apertural view. 15. Glandulina ovula, 36H-5, 148/150 cm, lateral view.