Globobulimina ovata ( d’Orbigny, 1846 )

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 : 10

Globobulimina ovata ( d’Orbigny, 1846)

Figures 4.13a, 4.13b, 4.14

1846 Bulimina ovata d’Orbigny : p. 185, pl. 11, figs. 13, 14.

1985 Praeglobobulimina ovata (d’Orbigny) ; p. 67, pl. 21, fig. 3.

2006 Globobulimina ovata (d’Orbigny) ; Ortiz and Thomas, p. 118, pl. 6, figs. 4, 5.

Description. Test elongated, slender, triserial with either rounded or pointed ends. Chambers elongated, increasing in size rapidly. Sutures clear, depressed, oblique. Wall finely perforate, smooth. Aperture basal, loop-shaped, with a small apertural tongue.

Remarks. This form is more elongated and slender with the last two more embracing chambers, which comprise three quarters of the total length of the test, than Globobulimina affinis . It differs from Globobulimina pacifica by being more elongate and possessing more than three chambers externally visible. The specimens in this study resemble the Eocene specimen of Globobulimina ovata ( d’Orbigny, 1846) illustrated by Ortiz and Thomas (2006, pl. 6, fig. 5a, b), but differ from the type specimen of G. ovata by its more overlapping and elongated chambers, less incised sutures, and possessing less chambers externally visible.

Figures

FIGURE 4. All scale bars are 100 µm. 1. Takayanagia delicata, 1H-CC; a. ventral view; b. dorsal view; c. edge view. 2. Eubuliminella exilis, 1H-CC, lateral view. 3. Eubuliminella cf. Eubuliminella exilis, 1H-CC, lateral view. 4. Fursenkoina complanata, 1H-CC, a. lateral view; b. edge view. 5. Bulimina rostratiformis, 8H-3, 146–148 cm; a. lateral view; b. apertural view. 6. Bulimina spicata, 62X-5, 146–148 cm, lateral view. 7. Globobulimina affinis, 8H-CC, lateral view. 8. Globobulimina auriculata, 25H-CC, lateral view. 9. Globobulimina barbata, 8H-3, 146–148 cm; a. lateral view; b. apertural view. 10. Globobulimina barbata, 52H-CC, lateral view. 11. Globobulimina cf. Globobulimina pacifica, 8H-CC, lateral view. 12. Globobulimina cf. Globobulimina spinenscens, 61X-5, 115–117 cm; a. lateral view; b. apertural view. 13. Globobulimina ovata, 18H-3, 146–148 cm; a. lateral view; b. apertural view. 14. Globobulimina ovata, 36H-5, 148–150 cm, lateral view. 15. Uvigerina peregrina, 1H-CC; a. lateral view; b. apertural view. 16. Uvigerina peregrina, 3H-CC; a. lateral view; b. apertural view. 17. Uvigerina proboscidea, 12H-3, 146–148 cm; a. lateral view; b. apertural view. 18. Uvigerina proboscidea, 14H-CC, lateral view. 19. Uvigerina senticosa, 7H-CC, lateral view. 20. Uvigerina senticosa, 14H-CC; a. lateral view; b. apertural view. 21. Uvigerina interruptacostata, 3H-CC; a. lateral view; b. apertural view. 22. Uvigerina interruptacostata, 8H-3, 146–148 cm, lateral view. 23. Rutherfordoides erectus, 1H-CC; a. lateral view view; b. edge view. 24. Siphonodosaria sp. A, 36H-5, 148–150 cm, lateral view.