Oridorsalis umbonatus (Reuss)

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 : 112-113

Oridorsalis umbonatus (Reuss)

Figures 32.23, 32.24

1851 Rotalia umbonata Reuss , p. 75, pl. 5, fig. 35.

1884 Truncatulina tenera Brady , p. 665, pl. 95, fig. 11.

1921 Pulvinulina umbonata (Reuss) — Cushman, pp. 339, 340, pl. 71, fig. 1.

1941 Eponides umbonatus (Reuss) — LeRoy (Part 2), p. 84, pl. 3, figs. 19—21.

1944 Eponides umbonatus (Reuss) — LeRoy (Part 1), p. 34, pl. 2, figs. 22—24.

1964 Pseudoeponides umbonatus (Reuss) — LeRoy, p. F39, pl. 7, figs. 33—38.

1966 Oridorsalis umbonatus (Reuss) — Belford, pp. 172, 173, pl. 30, figs. 1—6, text-figs. 22-4, 22-5.

1988 Oridorsalis umbonatus (Reuss) — Marle, p. 148, pl. 3, figs. 10, 15.

1989 Oridorsalis umbonatus (Reuss) — Inoue, p. 158, pl. 24, fig. 13.

1989 Oridorsalis tener (Brady) — Ōki, p. 149, pl. 20, fig. 8.

1990 Oridorsalis umbonatus (Reuss) — Akimoto, p. 206, pl. 24, fig. 4; Ujiié, pp. 48, 49, pl. 28, figs. 1—6, text-fig. 4.

1994 Oridorsalis umbonatus (Reuss) — Xu and Ujiié, pp. 518, 519, figs. 10-1, 10-2; Akimoto, p. 285, pl. 3, fig. 5.

1994 Oridorsalis umbonata (Reuss) — Jones, p. 99, pl. 95, fig. 11, p. 104, pl. 105, fig. 2.

1995 Oridorsalis umbonatus (Reuss) — Ujiié, pl. 8, figs. 3, 4.

1998 Oridorsalis umbonatus (Reuss) — Hess, pp. 85, 86, pl. 14, figs. 9, 10.

2000 Oridorsalis umbonatus (Reuss) — Ohkushi, Thomas, and Kawahata, p. 144, pl. 5, fig. 1.

2001 Oridorsalis umbonatus (Reuss) — Hayward, Carter, Grenfell, and Hayward, figs.16-R, 16-S.

Remarks. Ujiié (1990) distinguished Eponides tenerus (Brady) and Oridorsalis umbonatus

(Reuss) based on the supplementary aperture in dorsal sutures. We regard these two as synonyms;

there is variation in the development of supplementary apertures, which conforms with the description supplied by Loeblich and Tappan (1987).

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

Figures

FIGURE 32. Family Nonionidae, Chilostomellidae, Alabaminidae, Osangulariidae, and Oridorsalidae. All scale bars = 0.1mm. 1. Astrononion hayamaense Kurihara, MPC-26136 from sample 18 (Oura Formation,?PL1). 2. Astrononion stelligerum (d'Orbigny), MPC-26137 from sample MK01 (Yonahama F., PL2). 3, 4. Fijinonion fijiensis (Cushman and Edwards), 3: MPC-26259, 4: MPC-26260, both from sample 2-2 (Minebari F., PL5). 5. Laminononion tumidum (Cushman and Edwards), MPC-26345 from sample 15 (Yonahama F., PL3). 6, 7. Pacinonion umbilicatulum (Uchio), 6: MPC-26401 from sample 1 (Minebari F., PL5); 7: MPC-26402 from sample 12 (Minebari F., PL5). 8, 9. Melonis barleeanum (Williamson), 8: MPC-26370 from sample MK01 (Yonahama F., PL2); 9: MPC-26371 from sample MK02 (Minebari F., PL5). 10, 11. Melonis pacificum (Cushman), 10: MPC-26372 from sample 5-2 (Minebari F., PL5); 11: MPC- 26373 from sample MK02B (Minebari F., PL5). 12—14. Melonis pompilioides (Fichtel and Moll), 12: MPC-26374 from sample 3 (Onogoshi F., PL1); 13: MPC-26375 from sample 3-2-up-sand (Onogoshi F., PL1); 14: MPC-26376 from sample MK01 (Yonahama F., PL2). 15, 16. Pullenia bulloides (d'Orbigny), 15: MPC-26443 from sample 6 (Yonahama F., PL2); 16: MPC-26442 from sample MK01 (Yonahama F., PL2). 17, 18. Pullenia quinqueloba (Reuss), 17: MPC- 26444 from sample 1 (Minebari F., PL5); 18: MPC-26445 from sample 7 (Yonahama F., PL4). 19. Chilostomella cushmani Chapman, MPC-26194 from sample 5 (Minebari F., PL5). 20. Alabamina japonica (Asano), MPC-26107 from sample 12 (Minebari F., PL5). 21, 22. Osangularia culter (Parker and Jones), 21: MPC-26399 from sample 7 (Yonahama F., PL4); 22: MPC-26400 from sample 16 (Yonahama F., PL3). 23, 24. Oridorsalis umbonatus (Reuss), 23: MPC-26396 from sample 1-2 (Minebari F., PL5); 24: MPC-26397 from sample MK01 (Yonahama F., PL2).