Hyalinonetrion gracilium (Seguenza, 1862)

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 : 37

Hyalinonetrion gracilium (Costa)

Figures 13.8, 13.9

1856 Amphorina gracillis Costa, p. 125, pl. 11, fig. 11.

1862 Amphorina gracillima Seguenza , p. 51, pl. 1, fig. 37.

1913 Lagena gracilima (Seguenza) — Cushman, p. 11, pl. 1, fig. 4.

1956 Lagena gracilima (Seguenza) — Asano (a), p. 30, pl. 5, figs. 11—13.

1990 Lagena gracilima (Seguenza) — Ujiié, pp. 17, 18, pl. 4, fig. 14.

1994 Procerolagena gracilima (Seguenza) — Jones, p. 62, pl. 56, figs. 19—22, 24—29.

2002 Hyalinonetrion gracilima (Seguenza) — Akimoto, Matsui, Shimokawa, and Furukawa, p. 10, 11, pl. 23, fig. 5.

2012 Hyalinonetrion gracillium (Costa) — Milker and Schmiedl, p. 74, fig. 18.30.

Remarks. We basically follow Milker and Schmiedl

(2012) for synonymy. Loeblich and Tappan (1994)

distinguished specimens of Lagena gracilima Seguenza of Brady’s (1884) “Challenger Report” (pl.

56, figs. 25, 26) as Hyalinonetrion dissomapolitium ,

but here we accept a wider range of variation in test inflation.

Occurrence. Rare in the Yonahama and Minebari formations.

Figures

FIGURE 13. Family Vaginulinidae, Lagenidae, Polymorphinidae, and Ellipsolagenidae. All scale bars = 0.1mm, unless otherwise indicated. 1, 2. Vaginulinopsis tenuis (Bornemann), 1: MPC-26529, 2: MPC-26530, both from sample 2-2 (Minebari Formation, PL5). 3, 4. Planularia californica (Galloway and Wissler), 3: MPC-26414, 4: MPC- 26415, both from sample 2-2 (Minebari F., PL5). 5, 6. Vaginulina bradyi Cushman, 5: MPC-26526 from sample 4 (Minebari F., PL5); 6: MPC-26527 from sample MK01 (Yonahama F., PL2). 7. Conolagena favosopunctata (Brady), MPC-26209 from sample MK02A-2 (Minebari F., PL5). 8. 9. Hyalinonetrion gracillium (Costa), 8: MPC-26332 from sample 6-2 (Yonahama F., PL2); 9: MPC-26333 from sample MK02A-2 (Minebari F., PL5). 10, 11. Lagena sulcata (Walker and Jacob), 10: MPC-26343 from sample 3-2-up-sand (Onogoshi F., PL1); 11: MPC-26344 from sample 17 (Yonahama F., PL2). 12. Procerolagena gracilis (Williamson), MPC-26425 from sample 14-2 (Yonahama F., PL4). 13, 14. Procerolagena multilatera (McCulloch), 13: MPC-26426 from sample 8-2 (Yonahama F., PL4); 14: MPC- 26427 from sample 14 (Yonahama F., PL4). 15, 16. Pygmaeoseistron aspera (Reuss), 15: MPC-26446 from sample 3-2-up-sand (Onogoshi F., PL1); 16: MPC-26447 from sample 16 (Yonahama F., PL3). 17, 18. Pygmaeoseistron hispidulum (Cushman), 17: MPC-26448 from sample 1 (Minebari F., PL5); 18: MPC-26449 from sample 15 (Yonahama F., PL3). 19—22. Pygmaeoseistron oceanicum (Albani), 19: MPC-26450 from sample 5 (Minebari F., PL5); 20: MPC- 26451 from sample 7 (Yonahama F., PL4); 21: MPC-26549 from sample 11 (Onogoshi F.,?PL1), 22: MPC-26550 from sample 17 (Yonahama F., PL2). 23. Pygmaeoseistron sp. indet. MPC-26452 from sample 10 (Onogoshi F., PL2). 24—26. Sigmoidella elegantissima (Parker and Jones), 24: MPC-46490 from sample 2-2 (Minebari F., PL5); 25: MPC-46491 and 26: MPC-46492 from sample 18 (Oura F.,?PL1). 27. Exsculptina glaphyraheda Loeblich and Tappan, MPC-26254 from sample 17 (Yonahama F., PL2). 28. Favulina melo (d'Orbigny), MPC-26257 from sample 4-2 (Minebari F., PL5).