Spiroloculina

Mamo, Briony L., 2016, Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215 (1), pp. 1-123 : 32

Spiroloculina sp. 1 ( Fig. 7 :3–4)

Description. Test oval in outline with squared-off, concave peripheries. Chambers are arranged with massiline coiling with pronounced carinate ornament. Test wall between carina are concave with roughened texture due to presence of very fine striae. Both oral and aboral ends produced. Aperture terminal, as wide as final chamber, with a moderate peristomal lip and simple nub-like tooth.

Remarks. The highly curved outline of this taxon is similar to Spiroloculina parvula Chapman 1902 . However, the sutures are insufficiently depressed and unlike S. parvula and other collected spiroloculine taxa, the exterior chambers of this taxon are strongly inflated, almost completely obscuring earlier chambers ( Fig. 7 :3). Although this suite of features appears to be unique, this species was not recovered in sufficient numbers to erect a new species.

Distribution within study area. Spiroloculina sp. 1 was not recovered in high abundance with no more than two specimens per site. This taxon was most abundant at site 2 in Wistari Lagoon and was found in all reefs but Sykes Reef.

Figures

FIGURE 7. (Unless otherwise specified all scale bars = 100 µm). 1 – 2. Spiroloculina foveolata Egger, 1893, QM # G 465816 from OTI 36. 1. Lateral view. 2. Oral view. 3 – 4. Spiroloculina sp. 1, QM # G 465834 from OTI 39. 3. Lateral view. 4. Peripheral view. Scale bars = 200 µm. 5 – 6. Pitella haigi Langer, 1992, QM # G 465806 from T 2 – 3. 5. Lateral view. 6. Oral view. 7 – 8. Siphonaperta crassa Vella, 1957, QM # G 466065 from T 3 – 6. 7. Lateral view. 8. Oral view. 9 – 10. Siphonaperta distorqueata (Cushman, 1954), QM # G 465912 from OTI 52. 9. Lateral view. 10. Oral view. 11 – 14. Hauerina earlandi Rasheed, 1971, scale bars = 50 µm. 11 – 12. QM # G 465987 from OTI 39 lateral (11) and peripheral (12) views. 13 – 14. QM # G 466103 from OTI 51 lateral (13) and oral (14) views. 15 – 18. Hauerina pacifica Cushman, 1917. 15 – 16. QM # G 465899 from ST / HW 10. Lateral view (15) and close-up oral view (16). Scale bar = 10 µm. 17 – 18. QM # G 466125 from T 1 – 8. 17. Lateral view. 18. Oral view. 19 – 20. Quinqueloculina cf. Q. agglutinans d’Orbigny, 1839, QM # G 465807 from T 2 – 3, lateral view (19) and peripheral view (20).