Bulimina aff. kochiensis Takayanagi, 1953

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 : 82-84

Bulimina aff. kochiensis Takayanagi

Figures 26.3, 26.4

Compared with: 1953 Bulimina kochiensis Takayanagi , p. 31, pl. 4, fig. 12.

1966 Bulimina ampliapertula Belford , p. 65, pl. 5, figs. 18—21, text-figs. 5-10.

1975 Bulimina sp. — Kameyama, pl.-fig. 5.

1989 Bulimina kochiensis Takayanagi — Ōki, p. 114, pl. 11, fig. 2 (non Takayanagi, 1953).

1994 Bulimina ampliapertula Belford — Loeblich and Tappan, p. 124, pl. 243, figs. 11, 12; Akimoto, p. 283, pl. 2, fig. 10.

Description. Test elongate and slender, three times longer than wide; chambers inflated, increasing slowly as added; suture depressed; lower part of test ornamented with thin striae which form acute angles at periphery; test wall radiate, finely perforated; aperture narrow, slit-like, semi-vertical on apertural face; tooth plate developed.

Remarks. This species resembles the above– listed taxa, yet is distinguished from them by its narrow apertural opening. In our view, Bulimina kochiensis is a senior synonym of B. ampliapertura .

Occurrence. Rare in the Minebari Formation.

Figures

FIGURE 26. Family Buliminidae, Buliminellidae, and Uvigerinidae. All scale bars = 0.1mm, unless otherwise indicated. 1, 2. Bulimina aculeata d'Orbigny, 1: MPC-26168 from sample 8 (Yonahama Formation, PL4); 2: MPC-26169 from sample 8-2 (Yonahama F., PL4). 3, 4. Bulimina aff. kochiensis Takayanagi, 3: MPC-26174 from sample 1 (Minebari F., PL5); 4: MPC-26175 from sample 2 (Minebari F., PL5). 5, 6. Bulimina gutta Cushman and Parr, 5: MPC- 26170 from sample 14 (Yonahama F., PL4); 6: MPC-26171 from sample 14-2 (Yonahama F., PL4). 7, 8. Bulimina inflata Seguenza, 7: MPC-26172, 8: MPC-26173, both from sample MK01 (Yonahama F., PL2). 9, 10. Bulimina marginata d'Orbigny, 9: MPC-26176 from sample MK01 (Yonahama F., PL2); 10: MPC-26177 from sample MK02B (Minebari F., PL5). 11, 12. Bulimina striata d'Orbigny, 11: MPC-26178 from sample 3-2-low-silt (Onogoshi F., PL1); 12: MPC-26179 from sample 4-2 (Minebari F., PL5). 13, 14. Bulimina subornata Brady, 13: MPC-26180 from sample 5 (Minebari F., PL5); 14: MPC-26181 from sample MK02B (Minebari F., PL5). 15, 16. Bulimina truncana Gümbel, 15: MPC-26182 from sample 7 (Yonahama F., PL4); 16: MPC-26183 from sample 14-2 (Yonahama F., PL4). 17—19. Globobulimina pyrula (d'Orbigny), 17: MPC-26281 from sample 17 (Yonahama F., PL2); 18: MPC-26282 from sample MK02B (Minebari F., PL5); 19: MPC-26283 from sample 2-2 (Minebari F., PL5). 20. Buliminella elegantissima (d'Orbigny), MPC-26184 from sample MK02B (Minebari F., PL5). 21, 22. Euuvigerina asperula (Cžjžek), 21: MPC- 26243 from sample 8 (Yonahama F., PL4); 22: MPC-26244 from sample 16 (Yonahama F., PL3). 23, 24. Euuvigerina canariensis (d'Orbigny), 23: MPC-26245 from sample 2 (Minebari F., PL5); 24: MPC-26246 from sample MK02A (Minebari F., PL5).