Alabaminoides exiguus (Brady)

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 : 100-102

Alabaminoides exiguus (Brady)

Figures 30.9, 30.10

1884 Pulvinulina exigua Brady , p. 696, pl. 103, figs. 13, 14.

1988 Epistominella exigua (Brady) — Marle, p. 143, pl. 3, figs. 6—8.

1989 Epistominella exigua (Brady) — Inoue, pp. 153, 154, pl. 18, fig. 12, pl. 26, fig. 2.

1990 Pseudoparella exigua (Brady) — Akimoto, p. 208, pl. 20, fig. 7, pl. 24, fig. 3.

1990 Epistominella exigua (Brady) — Ujiié, p. 32, pl. 14, fig. 1.

1992 Epistominella exigua (Brady) — Kaiho, pl. 8, fig. 6.

1994 Alabaminoides exiguus (Brady) — Jones, p. 103, pl. 103, figs. 13, 14.

1994 Pseudoparella exigua (Brady) — Loeblich and Tappan, p. 146, pl. 307, figs. 1—7; Akimoto, p. 285, pl. 3, fig. 8.

1994 Epistominella exigua (Brady) — Xu and Ujiié, p. 518, figs.7-1, 7-2.

1995 Epistominella exigua (Brady) — Ujiié, pp. 67, 68, pl. 10, fig. 3.

1998 Epistominella exigua (Brady) — Hess, p. 80, pl. 14, figs. 15, 16.

2000 Epistominella exigua (Brady) — Ohkushi, Thomas, and Kawahata, p. 139, pl. 3, fig. 1.

2001 Epistominella exigua (Brady) — Hayward, Carter, Grenfell, and Hayward, figs.15-Y, 15-Z, 15-AA.

Remarks. This species has been listed either as a member of the genus Pseudoparella or of Epistominella among Japanese workers who focused on the character of the aperture parallel to the periphery. We follow Jones’s (1994) placement in the genus Alabaminoides . It is characterized by a noncarinate periphery, a small number of chambers and a slightly raised dorsal (biconvex) test, not like Epistominella .

Occurrence. Rare in the Yonahama Formation, sporadic in the Minebari Formation.

Figures

FIGURE 30. Family Parrelloididae, Pseudoparrellidae, Discorbinellidae, and Planulinidae. All scale bars = 0.1mm. 1—4. Cibicidoides pachyderma (Rzehak), 1: MPC-26203 from sample MK01 (Yonahama Formation, PL2); 2: MPC- 26204 from sample 4-2 (Minebari F., PL5); 3: MPC-26205 from sample 3-2-up-sand (Onogoshi F., PL1); 4: MPC- 26206 from sample 5-2 (Minebari F., PL5); 3 and 4, inflate-chamber variation. 5, 6. Cibicidoides sp.A, 5: MPC-26207, 6: MPC-26208, both from sample MK01 (Yonahama F., PL2). 7, 8. Parrelloides bradyi (Trauth), 7: MPC-26409 from sample 7 (Yonahama F., PL4); 8: MPC-26410 from sample MK01 (Yonahama F., PL2). 9, 10. Alabaminoides exiguus (Brady), 9: MPC-26108 from sample MK01 (Yonahama F., PL2); 10: MPC-26109 from sample MK02A (Minebari F., PL5). 11, 12. Eilohedra rotunda (Husezima and Maruhasi), 11: MPC-26230 from sample 1-2 (Minebari F., PL5); 12: MPC-26231 from sample MK02B (Minebari F., PL5). 13, 14. Facetocochlea pulchra (Cushman), 13: MPC-26255 from sample 3-2-low-silt (Onogoshi F., PL1); 14: MPC-26256 from sample 5-2 (Minebari F., PL5). 15. Discorbinella montereyensis Cushman and Martin, MPC-26223 from sample 12 (Minebari F., PL5). 16, 17. Laticarinina pauperata (Parker and Jones), 16: MPC-26348 from sample 7 (Yonahama F., PL4); 17: MPC-26349 from sample MK01 (Yonahama F., PL2). 18—21. Hyalinea balthica (Schröter), 18: MPC-26328 from sample MK01 (Yonahama F., PL2); 19: MPC-26329 from sample MK02B (Minebari F., PL5); 20: MPC-26330 from sample 5 (Minebari F., PL5); 21: MPC- 26331 from sample 5-2 (Minebari F., PL5); 20 and 21, inflated-chamber variation.