Sphaeroidinellopsis seminulina (Schwager)

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 : 66-67

Sphaeroidinellopsis seminulina (Schwager)

Figures 21.10, 21.11

1866 Globigerina seminula Schwager , p. 256, pl. 7, fig. 112.

1941 Globigerina seminulina Reuss — LeRoy (Part 1), p. 44, pl. 3, fig. 108.

1959 Sphaeroidinella dehiscens subdehiscens Blow , pp. 195, 196, pl. 12, figs. 71, 72.

1959 Sphaeroidinella seminula seminulina (Schwager) — Blow, pp. 197, 198, pl. 12, figs. 74—76.

1962 Sphaeroidinellopsis subdehiscens (Blow) — Belford, pp. 30, 31, pl. 8, figs. 26—28.

1962 Sphaeroidinellopsis seminulina seminulina (Schwager) — Belford, p. 31, pl. 8, figs. 22—25.

1963 Sphaeroidinellopsis seminulina (Schwager) — Saito, pp. 200, 201, pl. 56, fig. 13.

1963 Sphaeroidinellopsis subdehiscens (Blow) — Saito, p. 201, pl. 56, fig. 12.

1964 Sphaeroidinella seminula (Schwager) — LeRoy, p. F43, pl. 14, figs. 23, 24.

1967 Sphaeroidinella seminula (Schwager) — Parker, pp. 161, 162, pl. 23, figs. 1—5.

1967 Sphaeroidinella subdehiscens Blow — Parker, p. 162, pl. 23, figs. 6, 7.

1968 Sphaeroidinellopsis seminulina (Schwager) — Huang, p. 61, pl. 11, figs. 26, 27.

1969 Sphaeroidinellopsis subdehiscens subdehiscens (Blow) — Blow, p. 338, pl. 20, figs. 1—3, 6, pl. 31, figs. 1—3.

1974 Sphaeroidinellopsis seminula seminula (Schwager) — Ujiié and Ōki, pl. 1, fig. 12.

1976 Sphaeroidinellopsis seminula seminula (Schwager) — Natori, p. 229, pl. 1, fig. 2.

1976 Sphaeroidinellopsis subdehiscens subdehiscens (Blow) — Natori, p. 229, pl. 1, fig. 1.

1977 Sphaeroidinella seminulina (Schwager) — Kadar, p. 64, pl. 3, figs. 17, 18.

1978 Sphaeroidinellopsis seminulina (Schwager) — Oda, p. 64, pl. 10, figs. 11, 12.

1978 Sphaeroidinella subdehiscens Blow — Keller (a), pl. 5, figs. 14, 15.

1983 Sphaeroidinellopsis seminula seminula (Schwager) — Kennett and Srinivasan, pp. 206, 208, pl. 51, figs. 1, 6—8.

1985 Sphaeroidinellopsis seminula seminula (Schwager) — Ibaraki, p. 140, pl. 13, figs. 12, 13.

1985 Sphaeroidinellopsis subdehiscens subdehiscens (Blow) — Ibaraki, p. 141, pl. 13, figs. 16, 17.

1985 Sphaeroidinellopsis seminulina (Schwager) — Ujiié, pp. 110, 111, pl. 7, figs. 9—11; Bolli and Saunders, pp. 241, 242, figs. 38.6—38.13.

Remarks. We do not separate the morphotype subdehiscens Blow from S. seminulina following the view expressed by Srinivasan and Kennett (1981).

Occurrence. Low in number, but continuously present from the Onogoshi Formation to the lower part of the Yonahama Formation.

Figures

FIGURE 21. Family Globigerinidae, All scale bars = 0.1mm. 1. Globigerinoidesella fistulosa (Schubert), MPC-25967 from sample 8-2 (Yonahama Formation, PL4). Poor preservation is due to serious recrystallization. 2, 3. Globoturborotalita decoraperta (Takayanagi and Saito), 2: MPC-25990 from sample 6 (Yonahama F., PL2); 3: MPC-25991 from sample MK01 (Yonahama F., PL2). 4, 5. Globoturborotalita nepenthes (Todd), 4: MPC-25992 from sample 3 (Onogoshi F., PL1); 5: MPC-25993 from sample 11 (Onogoshi F.,?PL1). Specimens of this study are young form lack elongate later chambers, but narrow-raising aperture with distinct rim characterize this species. 6, 7. Globoturborotalita rubescens (Hofker), 6: MPC-25994 from sample 6 (Yonahama F., PL2); 7: MPC-25995 from sample MK01 (Yonahama F., PL2). 8, 9. Sphaeroidinella dehiscens (Parker and Jones), 8: MPC-26025 from sample 8-2 (Yonahama F., PL4); 9: MPC-26026 from sample MK02B (Minebari F., PL5). 10, 11. Sphaeroidinellopsis seminulina (Schwager), 10: MPC-26027 from sample MK01 (Yonahama F., PL2); 11: MPC-26028 from sample 6 (Yonahama F., PL2). 12, 13. Turborotalita humilis (Brady), 12: MPC-26029 from sample 10 (Onogoshi F., PL2); 13: MPC-26030 from sample MK01 (Yonahama F., PL2). 14, 15. Turborotalita quinqueloba (Natland), 14: MPC-26031 from sample MK01 (Yonahama F., PL2); 15: MPC-26032 from sample MK02B (Minebari F., PL5). 16, 17. Orbulina suturalis Brönnimann, 16: MPC- 26015 from sample 8 (Yonahama F., PL4); 17: MPC-26016 from sample 14 (Yonahama F., PL4). 18, 19. Orbulina universa d'Orbigny, 18: MPC-26017 from sample 8-2 (Yonahama F., PL4); 19: MPC-26018 from sample MK02A (Minebari F., PL5).