Amphicoryna separans (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 : 34

Amphicoryna separans (Brady)

Figures 12.9-12.11

1884 Nodosaria scalaris var. separans Brady , p. 511, pl. 64, figs. 16—19.

1902 Nodosaria scalaris var. separans Brady — Millett (part XIII), pp. 520, 521, pl. 11, figs. 11, 12.

1913 Nodosaria scalaris (Batsch) — Cushman, p. 58, pl. 24, fig. 7.

1941 Lagenonodosaria scalaris (Batsch) — LeRoy (Part 1), p. 28, pl. 2, figs. 30, 31; LeRoy (Part 2), p. 77, pl. 2, fig. 18.

1944 Lagenonodosaria scalaris (Batsch) — LeRoy (Part 1), p. 21, pl. 8, fig. 12.

1956 Lagenonodosaria separans (Brady) — Asano (a), p. 28, pl. 6, figs. 8, 9.

1964 Lagenonodosaria scalaris (Batsch) — LeRoy, p. F27, pl. 15, figs. 20, 29.

1968 Amphicoryna scalaris (Batsch) — Huang, p. 55, pl. 13, fig. 12.

1988 Amphicoryna scalaris (Batsch) — Wang, Zhang, Zhao, Min, Bian, Zheng, Cheng, and Chen, p. 139, pl. 17, figs. 17, 19; Marle, p. 139, pl. 4, fig. 22.

1989 Amphicoryna scalaris (Batsch) — Ōki, pp. 92, 93, pl. 6, fig. 3.

1990 Amphicoryna scalaris (Batsch) — Akimoto, p. 191, pl. 17, fig, 7.

1992 Amphicoryna scalaris (Batsch) — Hatta and Ujiié (b), p. 166, pl. 21, fig. 8.

1994 Amphicoryna scalaris (Batsch) — Jones, p. 75, pl. 63, figs. 29—31.

1994 Amphicoryna separans (Brady) — Jones, p. 76, pl. 64, figs. 16—19; Loeblich and Tappan, p. 71, pl. 127, figs. 1—18.

1998 Amphicoryna scalaris (Batsch) — Hess, p. 76, pl. 12, fig. 2.

Remarks. This is one of the commoner bathyal species in the waters around Japan. The protruding neck of A. separans is annulated, whereas that of A. scalaris is smooth and elongate; for this reason, previous records of A. scalaris from Japan are in fact A. separans as listed, in part, in the synonymy by Loeblich and Tappan (1994). Separation of chambers is not a prime feature in the identification of this species, irrespective of the specific name. In addition, we here show a broken and separated unilocular specimen to illustrate that such specimens may induce erroneous identification as a unilocular species.

Occurrence. Common in all the formations of the present study.

Figures

FIGURE 12. Family Vaginulinidae. All scale bars = 0.1mm, unless otherwise indicated. 1, 2. Saracenaria aff. akitaensis Iwasa and Kikuchi, 1: MPC-26485 from sample 2 (Minebari Formation, PL5); 2: MPC-26486 from sample 17 (Yonahama F., PL2). 3. Saracenaria altifrons (Parr), MPC-26487 from sample 15 (Yonahama F., PL3). 4, 5. Saracenaria italica Defrance, 4: MPC-26488, 5: MPC-26489, both from sample 2-2 (Minebari F., PL5). 6. Spincterules sp.A, MPC-26507 from sample 5-2 (Minebari F., PL5). 7, 8. Amphicoryna hispida (d'Orbigny), 7: MPC-26118 from sample 3-2-low-silt (Onogoshi F., PL1); 8: MPC-26119 from sample MK01 (Yonahama F., PL2). 9—11. Amphicoryna separans (Brady), 9: MPC-26120 from sample 3-2-low-silt (Onogoshi F., PL1); 10: MPC-26121 from sample 14-2 (Yonahama F., PL4), 11: MPC-26122 from sample 5 (Minebari F., PL5). 12, 13. Astacolus japonicus (Asano), 12: MPC- 26132 from sample 2 (Minebari F., PL5); 13: MPC-26133 from sample 6-2 (Yonahama F., PL2). 14. Astacolus insolitus (Schwager), MPC-26131 from sample 15 (Yonahama F., PL3). 15, 16. Hemirobulina aff. obesa (Cushman), 15: MPC-26546 from sample 16 (Yonahama F., PL3); 16: MPC-26315 from sample MK01 (Yonahama F., PL2). 17. Hemirobulina aff. uedai (Asano), MPC-26316 from sample 15 (Yonahama F., PL3). 18. Vaginulinopsis sublegumen Parr, MPC-26528 from sample 3 (Oura F., PL1).