Spirosigmoilina tenuis (Cžjžek)

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 : 23-25

Spirosigmoilina tenuis (Cžjžek)

Figures 9.5, 9.6

1848 Quinqueloculina tenuis Cžjžek , p. 149.

1964 Sigmoilinita tenuis (Cžjžek) — LeRoy, p.

F20, pl. 16, figs. 32, 33.

1977 Sigmoilinita tenuis (Cžjžek) — McCulloch, p. 536, pl. 227, figs. 1, 2.

1987 Sigmoilinita tenuis (Cžjžek) — Loeblich and Tappan, pl. 35, figs. 14—18 (redrawn of Seiglie’s (1965) figures).

1988 Sigmoilinita tenuis (Cžjžek) — Wang, Zhang, Zhao, Min, Bian, Zheng, Cheng, and Chen, pp. 130, 131, pl. 15, figs. 3, 4.

1994 Spirosigmoilina tenuis (Cžjžek) — Jones, p. 26, pl. 10, figs. 7, 8, 11.

Remarks. Jones (1994) regarded the genus Spirosigmoilina as a senior synonym of Sigmoilinita Seiglie (1965) ; we concur.

Occurrence. Sporadic in the Oura, Onogoshi, and

Yonahama formations.

Figures

FIGURE 9. Family Hauerinidae and Nodosariidae. All scale bars = 0.1mm, unless otherwise indicated. 1. Pyrgo subsphaerica (d'Orbigny), MPC-26087 from sample 6-2 (Yonahama Formation, PL2). 2. Pyrgo simplex (d'Orbigny), MPC-26086 from sample MK02B (Minebari F., PL5). 3. Triloculina tricarinata Parker, Jones, and Brady (young form), MPC-26104 from sample 1 (Minebari F., PL5). 4. Sigmoilina cf. sigmoidea (Brady), MPC-26097 from sample 6 (Yonahama F., PL2), aperture broken. 5, 6. Spirosigmoilina tenuis (Cžjžek), 5: MPC-26100 from sample 11 (Onogoshi F.,?PL1); 6: MPC-26101 from sample 18 (Oura F., PL1). 7, 8. Spirosigmoilina pusilla (Earland), 7: MPC-26102 from sample 5-2 (Minebari F., PL5); 8: MPC-26103 from sample 11 (Onogoshi F.,?PL1). 9, 10. Sigmoilopsis schlumbergeri (Silvestri), 9: MPC-26098 from sample 18 (Oura F.,?PL1); 10: MPC-26099 from sample MK01 (Yonahama F., PL2). 11. Chrysalogonium equisetiformis (Schwager), MPC-26196 from sample 16 (Yonahama F., PL3). 12, 13. Dentalina albatrossi (Cushman), 12: MPC-26216, 13: MPC-26217, both from sample 2-2 (Minebari F., PL5). 14. Chrysalogonium deceptorium (Schwager), MPC-26195 from sample 2-2 (Minebari F., PL5). 15, 16. Dentalina aff. catenulata (Brady), 15: MPC-26218 from sample 6-2 (Yonahama F., PL2); 16: MPC-26219 from sample 11 (Onogoshi F.,?PL1). 17, 18. Dentalina mutsui Hada, 17: MPC-26220 from sample 18 (Oura F.,?PL1); 18: MPC-26221 from sample MK01 (Yonahama F., PL2). 19. Dentalina sp.A, MPC-26222 from sample 8-2 (Yonahama F., PL4).