Pyrgo sp. A

Setoyama, Eiichi & Kaminski, Michael A., 2015, Neogene benthic foraminifera from the southern Bering Sea (IODP Expedition 323), Palaeontologia Electronica (International ed. in English) 76 (4), pp. 1-30 : 5

Pyrgo sp. A

Figure 3.2a, b

1989 Pyrgo sp. 1 : Hermelin, p. 37, pl. 3, figs. 1, 2.

Description. Test small, biloculine, oval in outline, subcircular in cross section with inflated chambers and a keeled periphery. Aperture rounded, terminal on a prominent apertural neck with a tooth.

Remarks. The specimens resemble Pyrgo affinis ( d’Orbigny, 1846) , but differ by possessing a clear apertural neck and its smaller size. It is also similar to juvenile forms of Pyrgo nasutus Cushman (1935) , but the periphery is not as strongly keeled and serrated. It may well be a juvenile of Pyrgo murrhina as suggested by Hermelin (1989).

Figures

FIGURE 3. All scale bars are 100 µm. 1. Pyrgo murrhina, 13H-3, 146–148 cm; a. lateral view; b. apertural view. 2. Pyrgo sp. A, 13H-3, 146–148 cm; a. lateral view; b. apertural view. 3. Triloculina cf. Triloculina trihedra, 9H-5, 146– 148 cm; a. lateral view; b. apertural view. 4. Bolivina seminuda, 3H-CC, lateral view. 5. Bolivina sp. A, 36H-CC; a. lateral view; b. edge view showing the asymmetrically positioned aperture. 6. Brizalina pacifica, 11H-5, 146–148 cm; a. lateral view; b. edge view. 7. Brizalina panayensis, 1H-CC; a. lateral view; b. edge view. 8. Bolivinita quadrilatera, 61X-5, 115–117 cm; a. lateral view; b. edge view showing the asymmetrically positioned aperture. 9. Takayanagia cf. Takayanagia cushmani, 1H-CC; a. ventral view showing the tooth plate; b. dorsal view; c. edge view. 10. Rutherfordoides tenuis, 10H-3, 146–148 cm; a. ventral view; b. dorsal view. 11. Globocassidulina neomargareta, 9H-5, 146– 148 cm; a. ventral view; b. apertural view showing the tooth plate; c. dorsal view; d. edge view. 12. Globocassidulina subglobosa, 13H-3, 146–148 cm; a. ventral view; b. dorsal view; c. edge view. 13. Islandiella helenae, 12H-3, 146– 148 cm; a. ventral view; b. ventral view in immersion; c. dorsal view; d. edge view. 14. Globocassidulina sp. A, 3H- CC; a. ventral side, b. dorsal side, c. edge view.