Euuvigerina vadescens (Cushman)

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 : 86-87

Euuvigerina vadescens (Cushman)

Figures 27.1, 27.2

1933 Uvigerina proboscidea Schwager var. vadescens Cushman (b), p. 85, pl. 8, figs. 14, 15.

1938 Uvigerina pseudoampullacea Asano (d), p. 613, pl. 17, figs. 28, 29.

1942 Uvigerina proboscidea Schwager var. vadescens Cushman — Cushman, pp. 50, 51, pl. 14, figs. 5—9.

1958 Uvigerina pseudoampullacea Asano — Asano, p. 37, pl. 7, figs. 1, 2.

1964 Uvigerina proboscidea Schwager var. vadescens Cushman — LeRoy, p. F35, pl. 3, fig. 38.

1988 Uvigerina proboscidea Schwager — Marle, pl. 3, figs. 11, 12 (non Uvigerina proboscidea Schwager, 1866 ).

1989 Uvigerina proboscidea vadescens Cushman — Inoue, p. 153, pl. 20, fig. 2.

1989 Uvigerina vadescens Cushman — Ōki, pp. 120, 171, 172, pl. 12, fig. 5.

1990 Uvigerina proboscidea Schwager , vadescens Cushman — Ujiié, p. 32, pl. 13, fig. 9.

1994 Uvigerina proboscidea vadescens Cushman — Xu and Ujiié, p. 516, figs. 6—10.

1994 Uvigerina proboscidea Schwager — Akimoto, p. 286, pl. 2, fig. 21.

2002 Uvigerina proboscidea vadescens Cushman — Akimoto, Matsui, Shimokawa, and Furukawa, p. 16, pl. 45, fig. 3.

Remarks. This species exhibits a wide range of variation in test size, length of apertural neck, and growth rate. It is occasionally difficult to distinguish younger specimens with shorter neck and compact chamber arrangement from E. canariensis , yet E.

vadescens usually has a slender shape. There appear to be intermediate-transitional forms in the growth of elongate apertural neck and uncoiling mode of chambers between the present species and Siphouvigerina ampullacea (Brady) .

Asano’s (1958) data on the bathymetric distribution indicate that this species prefers the lower sublittoral to upper bathyal off southwest Japan where the warm Kuroshio water flows.

Occurrence. Common in the Oura and Onogoshi formations, rare in the Yonahama and Minebari formations.

Figures

FIGURE 27. Family Uvigerinidae, Reussellidae, Fursenkoinidae, and Pleurostomellidae. All scale bars = 0.1mm. 1, 2. Euuvigerina vadescens (Cushman), 1: MPC-26247 from sample 10 (Onogoshi Formation, PL2); 2: MPC-26248 from sample 11 (Onogoshi F.,?PL1). 3—5. Uvigerina flintii Cushman, 3: MPC-26519 from sample 2-2 (Minebari F., PL5); 4: MPC-26520 from sample 3 (Onogoshi F., PL1); 5: MPC-26521 from sample 17 (Yonahama F., PL2). 6, 7. Uvigerina peregrina Cushman, 6: MPC-26522 from sample 6 (Yonahama F., PL2); 7: MPC-26523 from sample 6-2 (Yonahama F., PL2). 8. Uvigerina schencki Asano, MPC-26524 from sample 2 (Minebari F., PL5). 9. Uvigerina schwageri Brady, MPC-26525 from sample 5-2 (Minebari F., PL5). 10, 11. Angulogerina angulosa (Williamson), 10: MPC-26125 from sample MK01 (Yonahama F., PL2); 11: MPC-26126 from sample MK02B (Minebari F., PL5). 12, 13. Trifarina bradyi Cushman, 12: MPC-26517 from sample 3-2-up-sand (Onogoshi F., PL1); 13: MPC-26518 from sample 8 (Yonahama F., PL4). 14, 15. Reussella pulchra Cushman, 14: MPC-26461 from sample 2 (Minebari F., PL5); 15: MPC-26462 from sample MK01 (Yonahama F., PL2). 16. Fursenkoina acuta (d'Orbigny), MPC-26274 from sample 4-2 (Minebari F., PL5). 17—19. Neocassidulina hadai (Uchio), 17: MPC-26384 from sample 1 (Minebari F., PL5); 18: MPC-26385 from sample 15 (Yonahama F., PL3); 19: MPC-26386 from sample 16 (Yonahama F., PL3). 20, 21. Rutherfordoides mexicanus (Cushman), 20: MPC-26472 from sample 4 (Minebari F., PL5); 21: MPC-26473 from sample 5 (Minebari F., PL5). 22, 23. Rutherfordoides virgus (Nomura), 22: MPC-26474 from sample 1 (Minebari F., PL5); 23: MPC-26475 from sample 3-2-low-silt (Onogoshi F., PL1). 24, 25. Pleurostomella acuminata Cushman, 24: MPC-26420 from sample 7 (Yonahama F., PL4); 25: MPC-26421 from sample 17 (Yonahama F., PL2). 26—28. Pleurostomella alternans Schwager, 26: MPC-26422 from sample 7 (Yonahama F., PL4); 27: MPC-26423 and 28: MPC-26424 from sample 8-2 (Yonahama F., PL4); 27 large variation.