Bolivina cacozela Vella, 1957

Hanagata, S & Nobuhara, T, 2015, Illustrated guide to Pliocene foraminifera from Miyakojima, Ryukyu Island Arc, with comments on biostratigraph, Palaeontologia Electronica (Cambridge, England) 33 (8), pp. 1-142 : 68

Bolivina cacozela Vella

Figures 22.3-22.6

1957 Bolivina cacozela Vella , p. 33, pl. 8, figs. 162, 163.

2001 Bolivina cacozela Vella — Hayward, Carter, Grenfell, and Hayward, p. 583, figs. 14- L, 14-M.

Diagnosis. Moderate-sized and elongate species with perforated, yet smooth, flush surface and limbate septa.

Remarks. We recognize small and large forms; the former might be a different species, but we have tentatively included it here on the basis of similar morphology.

Occurrence. Sporadic in the Onogoshi, Yonahama, and Minebari formations. The large form is confined to the Minebari Formation.

Figures

FIGURE 22. Family Bolivinidae. All scale bars = 0.1mm. 1, 2. Bolivina antiqua d'Orbigny, 1: MPC-26140, 2: MPC- 26141, both from sample 18 (Oura Formation,?PL1). 3—6. Bolivina cacozela Vella, 3: MPC-26142 from sample 2-2 (Minebari F., PL5); 4: MPC-26143 from sample 5 (Minebari F., PL5); 5: MPC-26144 from sample 10 (Onogoshi F., PL2); 6: MPC-26145 from sample 16 (Yonahama F., PL3). Specimens of 3 and 4 have larger test size than those of 5 and 6. 7, 8. Bolivina glutinata Egger, 7: MPC-26148 from sample 15 (Yonahama F., PL3); 8: MPC-26149 from sample 16 (Yonahama F., PL3). 9, 10. Bolivina retia Oki, 9: MPC-26154, 10: MPC-26545, both from sample 4 (Minebari F., PL5); 9.4, moisturized specimen showing internal septa. 11, 12. Bolivina robusta Brady, 11: MPC-26155 from sample 5 (Minebari F., PL5); 12: MPC-26156 from sample 10 (Onogoshi F., PL2). 13, 14. Bolivina striatula Cushman, 13: MPC-26157 from sample 14-2 (Yonahama F., PL4); 14: MPC-26158 from sample MK01 (Yonahama F., PL2). 15, 16. Bolivina variabilis (Williamson), 15: MPC-26161 from sample 16 (Yonahama F., PL3); 16: MPC-26162 from sample MK01 (Yonahama F., PL2). 17, 18. Bolivina cochei Cushman and Adams, 17: MPC-26146, 18: MPC-26147, both from sample MK01 (Yonahama F., PL2). 19, 20. Bolivina kiiensis Asano, 19: MPC-26150 from sample 3 (Onogoshi F., PL1); 20: MPC-26151 from sample 3-2-low-silt (Onogoshi F., PL1). 21, 22. Bolivina pacifica Cushman and McCulloch, 21: MPC-26152 from sample 1-2 (Minebari F., PL5); 22: MPC-26153 from sample MK01 (Yonahama F., PL2). 23. Bolivina cf. subspinescens Cushman, MPC-26159 from sample MK01 (Yonahama F., PL2). 24. Bolivina cf. yabei Takayanagi, MPC-26163 from sample MK01 (Yonahama F., PL2). 25, 26. Bolivina sp.A, 25: MPC-26164 from sample 11 (Onogoshi F.,?PL1); 26: MPC-26165 from sample 16 (Yonahama F., PL3). 27. Bolivina translucens Phleger and Parker, MPC-26160 from sample 5-2 (Minebari F., PL5).