Siphonodosaria ketienziensis (Ishizaki)

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 : 94

Siphonodosaria ketienziensis (Ishizaki)

Figures 28.12, 28.13

1943 Ellipsonodosaria ketienziensis Ishizaki , p. 684, figs. 1, 6, 11.

1964 Stilostomella ketienziensis (Ishizaki) — LeRoy, p. F35, pl. 15, fig. 33.

1992 Stilostomella sp. A — Kaiho, pl. 5, fig. 11.

2002 Siphonodosaria ketienziensis (Ishizaki) — Hayward, pp.304, 305, pl. 3, figs. 21, 22.

Remarks. This species resembles Siphonodosaria lepidula , yet is distinguished by less depressed sutures and finer and shorter spines on the lower margin of the chambers. Nodosaria insecta var. spinifera LeRoy (1941 , part 2, p. 74, pl. 1, fig. 17) may be a synonym of this species. Hayward et al. (2012) regarded this species to be synonymous with Siphonodosaria jacksonensis (Cushman and Applin) , originally described from the Eocene of Texas, although retained as a distinct species, since the holotype illustrated by Hayward et al. shows less depressed sutures.

Occurrence. Common in the Onogoshi, Yonahama, and Minebari formations.

Figures

FIGURE 28. Family Stilostomellidae and Bagginidae. All scale bars = 0.1mm. 1, 2. Myllostomella fijiensis (Cushman), 1: MPC-26382 from sample 7 (Yonahama Formation, PL4); 2: MPC-26383 from sample 15 (Yonahama F., PL3); 3, 4. Strictocostella hyugaensis (Ishizaki), 3: MPC-26513 from sample 3-2-low-silt (Onogoshi F., PL1); 4: MPC-26514 from sample 7 (Yonahama F., PL4). 5. Orthomorphina perversa (Schwager), MPC-26398 from sample 4-2 (Minebari F., PL5). 6, 7. Siphonodosaria aff. consobrina (d'Orbigny), 6: MPC-26495, 7: MPC-26496, both from sample 14-2 (Yonahama F., PL4). 8, 9. Siphonodosaria hayasakai (Ishizaki), 8: MPC-26497 from sample 4 (Minebari F., PL5); 9: MPC- 26498 from sample 6 (Yonahama F., PL2). 10, 11. Siphonodosaria longispina (Egger), 10: MPC-26499 from sample 8 (Yonahama F., PL4); 11: MPC-26500 from sample 8-2 (Yonahama F., PL4). 12, 13. Siphonodosaria ketienziensis (Ishizaki), 12: MPC-26501 from sample 14 (Yonahama F., PL4); 13: MPC-26502 from sample 14-2 (Yonahama F., PL4). 14, 15. Siphonodosaria lepidula (Schwager), 14: MPC-26503 from sample 5 (Minebari F., PL5); 15: MPC-26504 from sample MK01 (Yonahama F., PL2). 16, 17. Strictocostella modesta (Bermudez), 16: MPC-26515 from sample 14 (Yonahama F., PL4); 17: MPC-26516 from sample 16 (Yonahama F., PL3); 16, apertural projection broken. 18, 19. Baggina totomiensis Makiyama, 18: MPC-26138 from sample 3 (Onogoshi F., PL1); 19: MPC-26139 from sample 11 (Onogoshi F.,?PL1). 20, 21. Cancris auriculus (Fichtel and Moll), 20: MPC-26187 from sample 2 (Minebari F., PL5); 21: MPC-26188 from sample 18 (Oura F.,?PL1). 22, 23. Valvulineria glabra Cushman, 22: MPC-26531 from sample MK02B (Minebari F., PL5); 23: MPC-26532 from sample 14-2 (Yonahama F., PL4).