Saracenaria aff. akitaensis Iwasa and Kikuchi

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 : 32

Saracenaria aff. akitaensis Iwasa and Kikuchi

Figures 12.1, 12.2

Compared with:

1954 Saracenaria akitaensis Iwasa and Kikuchi , p. 191, text-fig. 3.

Diagnosis. Species with rounded triangular shape in cross section and smooth surface without depressed sutures and inflation of chambers.

Remarks. In general shape, this form closely resembles S. akitaensis originally described from the middle Miocene of northern Japan. Specimens from Miyakojima, however, have a smaller test size (about 0.6 mm in diameter) than S. akitaensis (1.5 mm in the original description).

Occurrence. Rare in the Yonahama and Minebari formations.

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).