Nonion japonicum Asano, 1938

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 : 107

Nonion japonicum Asano

Figures 31.17, 31.18

1938 Nonion japonicum Asano (b), p. 593, pl. 15, figs. 1, 2.

1959 Nonion japonicum Asano — Graham and Militante, pp. 71, 72, pl. 11, fig. 1.

1964 Nonion japonicum Asano — LeRoy, p. F27, pl. 10, figs. 12, 13.

1989 Florilus japonicus (Asano) — Ōki, pp. 146, 174, pl. 20, fig. 1.

1994 Nonion subturgidum (Cushman) — Loeblich and Tappan, p. 158, pl. 343, figs. 1— 9 (non Nonionina subturgida Cushman, 1924 ).

2002 Nonion japonicum Asano — Akimoto, Matsui, Shimokawa, and Furukawa, p. 24, pl. 59, fig. 3.

2006 Pseudononion japonicum Asano — Takata, Irizuki, and Ishida, pl. 2, fig. 3 (non Pseudononion japonicum Asano, 1936a ).

Remarks. This species is distinguished from N.

subturgidum by having numerous chambers and granules in the umbilicus, as described by Asano

(1938b).

Occurrence. Common in the Oura, Onogoshi, and

Minebari formations.

Figures

FIGURE 31. Family Planulinidae, Cibicididae, Epistomariidae, Amphisteginidae, and Nonionidae. All scale bars = 0.1mm. 1, 2. Planulina retia Belford, 1: MPC-26416 from sample 2 (Minebari Formation, PL5); 2: MPC-26417 from sample 5-2 (Minebari F., PL5). 3, 4. Cibicides refulgens de Montfort, 3: MPC-26197 from sample 2-2 (Minebari F., PL5); 4: MPC-26198 from sample 14-2 (Yonahama F., PL4). 5. Cibicides tenuimargo (Brady), MPC-26199 from sample 4-2 (Minebari F., PL5); stripe pattern on the dorsal side implies attached material. 6, 7. Fontbotia wuellerstorfi (Schwager), 6: MPC-26272 from sample MK01 (Yonahama F., PL2); 7: MPC-26273 from sample MK02A (Minebari F.,PL5).8, 9. Lobatula lobatula (Walker and Jacob), 8: MPC-26367 from sample 5 (Minebari F., PL5); 9: MPC-26368 from sample 5-2 (Minebari F., PL5). 10, 11. Dyocibicides biserialis Cushman and Valentine, 10: MPC-26224 from sample 2-2 (Minebari F., PL5); 11: MPC-26225 from sample 3-2-up-sand (Onogoshi F., PL1). 12—14. Pseudoeponides japonicus Uchio, 12: MPC-26430 from sample 14 (Yonahama F., PL4); 13: MPC-26431 and 14: MPC-26548 from sample MK02B (Minebari F., PL5); arrows in 14 shows slit opening along dorsal sutures. 15, 16. Amphistegina lessonii d'Orbigny, 15: MPC-26123 from sample 2 (Minebari F., PL5); 16: MPC-26124 from sample 2-2 (Minebari F., PL5); all specimens of this study are juveniles. 17, 18. Nonion japonicum Asano, 17: MPC-26392 from sample 5-2 (Minebari F., PL5); 18: MPC-26393 from sample 11 (Onogoshi F.,?PL1). 19, 20. Nonionellina labradorica (Dawson), 19: MPC-26394 from sample 1-2 (Minebari F., PL5); 20: MPC-26395 from sample MK02B (Minebari F., PL5). 21, 22. Pseudononion cuevasensis Saunder and Müller-Merz, 21: MPC-26438 from sample 10 (Onogoshi F., PL2); 22: MPC-26439 from sample MK02B (Minebari F., PL5). 23, 24. Pseudononion subcostatum Fujita and Ito, 23: MPC- 26440 from sample 14-2 (Yonahama F., PL4); 24: MPC-26441 from sample MK02B (Minebari F., PL5).