Allassoida tonohamaensis (Takayanagi)

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 : 81-82

Allassoida tonohamaensis (Takayanagi)

Figure 25.26

1953 Bifarina tonohamaensis Takayanagi , p. 32, pl. 4, fig. 8.

Remarks. This species has a longer biserial stage and a more compact uniserial stage than Sagrina virgula Brady. Genus Bifarina originally assigned to this species is a Cretaceous/Paleogene plankktonic taxon. Widely opened round aperture with conspicuous rip characterizes Allassoida .

Occurrence. A single specimen from the Minebari Formation.

Figures

FIGURE 25. Family Stainforthiidae and Siphogenerinoididae. All scale bars = 0.1mm. 1, 2. Stainforthia tenuata (Cushman), 1: MPC-26510 from sample 8-2 (Yonahama Formation, PL4); 2: MPC-26511 from sample 15 (Yonahama F., PL3). 3, 4. Euloxostomum bradyi (Asano), 3: MPC-26239 from sample 8-2 (Yonahama F., PL4); 4: MPC-26240 from sample MK02B (Minebari F., PL5). 5, 6. Euloxostomum pseudobeyrichi (Cushman), 5: MPC-26241 from sample 5 (Minebari F., PL5); 6: MPC-26242 from sample 5-2 (Minebari F., PL5). 7, 8. Hopkinsinella glabra (Millett), 7: MPC- 26326 from sample 1 (Minebari F., PL5); 8: MPC-26327 from sample 14-2 (Yonahama F., PL4). 9, 10. Rectobolivina asanoi Murata, 9: MPC-26453 from sample 18 (Oura F.,?PL1); 10: MPC-26454 from sample MK02A (Minebari F., PL5); 9 microspheric form, 10 megalospheric form. 11, 12. Rectobolivina bifrons (Brady), 11: MPC-26455 from sample 17 (Yonahama F., PL2); 12: MPC-26456 from sample MK01 (Yonahama F., PL2); 11 microspheric form, 12 megalospheric form. 13, 14. Rectobolivina sp.A, 13: MPC-26457 from sample 6 (Yonahama F., PL2); 14: MPC-26458 from sample 17 (Yonahama F., PL2). 15. Sagrinella convallaria (Millett), MPC-26476 from sample 10 (Onogoshi F., PL2). 16, 17. Sagrinella durrandii (Millett), 16: MPC-26477 from sample 1 (Minebari F., PL5); 17: MPC-26478 from sample 5 (Minebari F., PL5). 18, 19. Sagrinella jugosa (Brady), 18: MPC-26479, 19: MPC-26480, both from sample MK01 (Yonahama F., PL2). 20, 21. Saidovina formosana (Nakamura), 20: MPC-26481, 21: MPC-26482, both from sample 18 (Oura F.,?PL1). 22, 23. Saidovina karreriana (Brady), 22: MPC-26483 from sample 5 (Minebari F., PL5); 23: MPC-26484 from sample MK02B (Minebari F., PL5). 24, 25. Rectuvigerina striata (Schwager), 24: MPC-26459 from sample 8-2 (Yonahama F., PL4); 25: MPC-26460 from sample 14 (Yonahama F., PL4). 26. Allassoida tonohamaensis (Takayanagi), MPC-26110 from sample 1-2 (Minebari F., PL5).