Parrelloides bradyi (Trauth)

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 : 100

Parrelloides bradyi (Trauth)

Figures 30.7, 30.8

1918 Truncatulina bradyi Trauth , p. 235.

1951 Cibicides hyalina Hofker , p. 359, figs. 244, 245.

1964 Eponides hyalinus (Hofker) — LeRoy, p. F37, pl. 7, figs. 24—26.

1966 Parrelloides bradyi (Trauth) — Belford, pp. 100—102, pl. 11, figs. 10—19.

1968 Cibicidoides bradyi (Trauth) — Huang, p. 56, pl. 13, figs. 22, 23.

1988 Parrelloides bradyi (Trauth) — Marle, p. 148, pl. 3, figs. 16, 17.

1989 Cibicidoides bradyi (Trauth) — Hermelin, pp. 85, 86, pl. 17, figs. 2—4.

1990 Parrelloides bradyi (Trauth) — Akimoto, pp. 206, 207, pl. 20, fig. 2, pl. 23, fig. 8.

1992 Cibicidoides bradyi (Trauth) — Kaiho, pl. 6, figs. 3, 4, 6, 7.

1994 Gyroidina bradyi (Trauth) — Jones, p. 99, pl. 95, fig. 5.

1994 Parrelloides bradyi (Trauth) — Loeblich and Tappan, p. 144, pl. 301, figs. 1—9.

1996 Parrelloides hyalinus (Hofker) — Revets (b), p. 68, pl. 3, figs. 9, 10.

2000 Cibicidoides bradyi (Trauth) —— Ohkushi, Thomas, and Kawahata, p. 139, pl. 4, fig. 6.

Remarks. We regard Cibicides hyalina Hofker , type species of the genus Parrelloides , as a junior synonym of P. bradyi . Genus Parrelloides is distinguished from Cibicidoides in the smaller size and rounded periphery, and from Gyroidina in more convex spiral side, rounded periphery, and optically radial microstructure.

Occurrence. Common in the Yonahama Formation, rare in the Minebari Formation.

Figures

FIGURE 30. Family Parrelloididae, Pseudoparrellidae, Discorbinellidae, and Planulinidae. All scale bars = 0.1mm. 1—4. Cibicidoides pachyderma (Rzehak), 1: MPC-26203 from sample MK01 (Yonahama Formation, PL2); 2: MPC- 26204 from sample 4-2 (Minebari F., PL5); 3: MPC-26205 from sample 3-2-up-sand (Onogoshi F., PL1); 4: MPC- 26206 from sample 5-2 (Minebari F., PL5); 3 and 4, inflate-chamber variation. 5, 6. Cibicidoides sp.A, 5: MPC-26207, 6: MPC-26208, both from sample MK01 (Yonahama F., PL2). 7, 8. Parrelloides bradyi (Trauth), 7: MPC-26409 from sample 7 (Yonahama F., PL4); 8: MPC-26410 from sample MK01 (Yonahama F., PL2). 9, 10. Alabaminoides exiguus (Brady), 9: MPC-26108 from sample MK01 (Yonahama F., PL2); 10: MPC-26109 from sample MK02A (Minebari F., PL5). 11, 12. Eilohedra rotunda (Husezima and Maruhasi), 11: MPC-26230 from sample 1-2 (Minebari F., PL5); 12: MPC-26231 from sample MK02B (Minebari F., PL5). 13, 14. Facetocochlea pulchra (Cushman), 13: MPC-26255 from sample 3-2-low-silt (Onogoshi F., PL1); 14: MPC-26256 from sample 5-2 (Minebari F., PL5). 15. Discorbinella montereyensis Cushman and Martin, MPC-26223 from sample 12 (Minebari F., PL5). 16, 17. Laticarinina pauperata (Parker and Jones), 16: MPC-26348 from sample 7 (Yonahama F., PL4); 17: MPC-26349 from sample MK01 (Yonahama F., PL2). 18—21. Hyalinea balthica (Schröter), 18: MPC-26328 from sample MK01 (Yonahama F., PL2); 19: MPC-26329 from sample MK02B (Minebari F., PL5); 20: MPC-26330 from sample 5 (Minebari F., PL5); 21: MPC- 26331 from sample 5-2 (Minebari F., PL5); 20 and 21, inflated-chamber variation.