Bolivina antiqua d'Orbigny, 1846

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 antiqua d'Orbigny

Figures 22.1, 22.2

1846 Bolivina antiqua d’Orbigny , p. 240, pl. 14, figs. 11—13.

1985 Bolivina antiqua d’Orbigny — Papp and Schmid, p. 83, pl. 77, figs. 1—6.

1994 Bolivinellina translucens (Phleger and Parker) — Loeblich and Tappan, p. 111, pl. 213, figs. 9—14 (non Bolivina translucens Phleger and Parker, 1951 )

Remarks. Bolivina translucens has more inflated chambers and depressed sutures than the present species. The discrimination between the genera Bolivina and Brizalina has been controversial. Loeblich and Tappan (1987) considered Brizalina to be a valid genus, but Sgrella (1992) restudied Brizalina aenariensis Costa, type species of the genus, and concluded that it had features fitting Bolivina . Loeblich and Tappan (1994) followed Sgrella’s (1992) conclusion. Revets (1996a), on the other hand, remarked that Sgrrella’s (1992) examination was insufficient and retained the genus Brizalina , putting weight on the apertural character. We do not distinguish Brizalina here, following Loeblich and Tappan (1994), since the inner apertural character does not seem critical in separation taxa in this complex taxonomic group.

Occurrence. Common in the Oura 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).