Cycloforina rugosa (d'Orbigny)

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 : 21

Cycloforina rugosa (d'Orbigny)

Figure 8.4

1826 Quinqueloculina rugosa d’Orbigny , p. 302. (?nomen nudum).

1992 Quinqueloculina rugosa d’Orbigny — Hatta and Ujiié (a), p. 68, pl. 8, fig. 6.

Remarks. Genus Cycloforina is distinguished from

Quinqueloculina mainly by lack of chamber floor attaching penultimate chambers in adult specimen.

Occurrence. A single specimen from the Oura

Formation.

Figures

FIGURE 8. Family Spiroloculinidae and Hauerinidae. All scale bars = 0.1mm, unless otherwise indicated. 1. Adelosina schreibersii (d'Orbigny), MPC-26079 from sample 6 (Yonahama Formation, PL2). 2, 3. Ammomassilina alveoliniformis (Millett), 2: MPC-26080 from sample 12 (Minebari F., PL5); 3: MPC-26081 from sample MK02A (Minebari F., PL5). 4. Cycloforina rugosa (d'Orbigny), MPC-26082 from sample 18 (Oura F.,?PL1). 5, 6. Massilina minuta Collins, 5: MPC-26083, 6: MPC-26084, both from sample 14 (Yonahama F., PL4). 7, 8. Quinqueloculina akneriana d'Orbigny, 7: MPC-26088, 8: MPC-26089, both from sample 18 (Oura F.,?PL1). 9, 10. Quinqueloculina auberiana d'Orbigny, 9: MPC-26090 from sample 6 (Yonahama F., PL2); 10: MPC-26091 from sample 6-2 (Yonahama F., PL2). 11. Quinqueloculina sagamiensis Asano, MPC-26092 from sample 6-2 (Yonahama F., PL2). 12, 13. Quinqueloculina seminulum (Linnaeus), 12: MPC-26093 from sample 18 (Oura F.,?PL1); 13: MPC-26094 from sample MK02B (Minebari F., PL5). 14, 15. Quinqueloculina starkeri Loeblich and Tappan, 14: MPC-26095, 15: MPC-26096, both from sample 1 (Minebari F., PL5). 16. Pyrgo murrhina (Schwager), MPC-26085 from sample MK02A (Minebari F., PL5).