Euloxostomum pseudobeyrichi (Cushman)

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 : 78

Euloxostomum pseudobeyrichi (Cushman)

Figures 25.5, 25.6

1911 Bolivina beyrichi Reuss , var. alata (Seguenza) — Cushman, p. 35, fig. 57 (non Vulvulina alata Seguenza, 1862 ).

1926 Bolivina pseudobeyrichi Cushman (a), p. 45.

1953 Bolivina pseudobeyrichi Cushman — Drooger, p. 131, pl. 21, figs. 9, 10.

1958 Bolivina cf. barbata Phleger and Parker — Asano, p. 18, pl. 4, fig. 17.

1959 Bolivina pseudobeyrichi Cushman — Blow, p. 147, pl. 6, fig. 22.

1964 Bolivina alata (Seguenza) — LeRoy, p. F31, pl. 2, fig. 12.

1966 Brizarina pseudobeyrichi (Cushman) — Belford, pp. 28, 29, pl. 1, figs. 13—16, text-figs. 2-4—2-6.

1988 Brizalina alata (Seguenza) — Wang, Zhang, Zhao, Min, Bian, Zheng, Cheng, and Chen, p. 148, pl. 20, fig. 18.

1988 Brizalina pseudobeyrichi (Cushman) — Marle, p. 139, pl. 5, figs. 5, 6.

1989 Bolivina alata (Seguenza) — Inoue, pl. 33, fig. 5.

1994 Brizalina alata (Seguenza) — Jones, p. 58, pl. 53, figs. 2—4.

1994 Euloxostomum pseudobeyrichi (Cushman) — Loeblich and Tappan, p. 118, pl. 231, figs. 9—23.

Remarks. The relationship between B. alata and

B. pseudobeyrichi was discussed by Drooger

(1953), Blow (1959), Belford (1966), and others,

and we conclude they are distinct species. This species also resembles Bolivina barbata Phleger and Parker (1951) , but is differentiated by its fewer chambers and less rapid growth rate as pointed out by Asano (1958).

Occurrence. Rare in the Onogoshi, Yonahama,

and Minebari formations.

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).