Quinqueloculina bosciana d’Orbigny 1839

Mamo, Briony L., 2016, Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215 (1), pp. 1-123 : 37

Quinqueloculina bosciana d’Orbigny 1839 Fig. 8 :5–7)

1839 Quinqueloculina bosciana d’Orbigny , p. 191, pl. 11, figs 22–24.

1938 Quinqueloculina bosciana d’Orbigny ; Howchin, p. 292, pl. 15, fig. 15. 2009 Quinqueloculina bosciana d’Orbigny ; Parker, p. 185, fig. 132a–h. 2012 Quinqueloculina bosciana d’Orbigny ; Debenay, p. 120, pl. 6.

Description. See Parker (2009, p. 185, fig. 132a–h).

Remarks. Quinqueloculina bosciana d’Orbigny 1839 is characterised by an elongately oblong and compressed test that has rounded chamber margins, a circular terminal aperture atop a broad, slightly produced neck and a simple tooth that thickens at the tip. The sutures are slightly depressed and can be oblique to test orientation ( Fig. 8 :5, 7).

The type specimens illustrated by d’Orbigny (1839, pl. 11, figs 22–24) have distinctly depressed sutures and the neck and terminal aperture is located to the side of the upper test margin. The more recent lectotype assigned by Le Calvez (1977) shares these features except that, like the CG specimens, the final chamber brings the neck and aperture over the upper margin slightly so that it is more centrally located ( Fig. 8 :5–7). Specimens collected by Howchin (1938, pl. 15, fig. 15) are similar to d’Orbigny’s specimens with a terminal aperture that is angled to face outward from the side of the test. This is somewhat different to specimens described by Parker (2009) and Debenay (2012) and collected in the CG as part of this investigation, which have shallower sutures and the more central aperture.

The type locality for this species is Cuba, Saint-Thomas and Jamaica ( d'Orbigny 1839; Le Calvez 1977). Howchin (1939) recovered Upper Pliocene specimens from the Adilaidean Formation , Adelaide , Parker’s (2009) specimens were collected from Ningaloo Reef, Australia and Debenay’s (2012) from coastal areas, bays and shrimp ponds down to 10 m from New Caledonia.

Distribution within study area. Quinqueloculina bosciana is amongst the more abundant Quinqueloculina species collected from the CG. Sites of greatest abundance include 1, 2 and 7 from Wistari Lagoon and it was collected only once from Sykes Reef and a single live specimen was collected from site 52 in One Tree Lagoon 2. This taxon was collected in comparatively low numbers across the Heron Reef flat and it was absent from the channel sample. Despite rareity of this species, it appears to prefer water depths below tidal influence.

Figures

FIGURE 8. (Unless otherwise specified all scale bars = 100 µm). 1 – 2. Quinqueloculina cf. Q. agglutinans d’Orbigny, 1839. QM # G 465786 from ST / HW 2, lateral view (1), scale bar = 200 µm and oral view (2), scale bar = 200 µm. 3 – 4. Quinqueloculina baccaerti n. sp. QM # G 465818 from OTI 36. 3. Lateral view. 4. Oral view. 5 – 7. Quinqueloculina bosciana d’Orbigny, 1839. QM # G 465978 from WL 21, lateral view (5), oral view (6). 7. QM # G 466135 from OTI 36, lateral view. Scale bar = 50 µm. 8 – 9. Quinqueloculina latidentella Loeblich & Tappan, 1994, QM # G 465825 from OTI 36. 8. Lateral view. 9. Peripheral view. 10 – 21. Quinqueloculina neostriatula Thalmann, 1950. 10 – 11. QM # G 466102 from WL 19, lateral (10) and oral (11) views. 12 – 13. QM # G 465984 from OTI 52, lateral (12) and oral (13) views. Scale bar for 13 = 50 µm. 14. QM # G 466071 from HL 40, oral view. 15. QM # G 466068 from HL 40, close-up oral view. Scale bar = 50 µm. 16 – 17. QM # G 465983 from WL 21, lateral (16) and oral (17) views. Scale bar for 16 = 200 µm. 18 – 19. QM # G 465833 from OTI 39, lateral (18) and oral (19) views. Scale bar for 18 = 200 µm. 20 – 21. QM # G 466096 from OTI 52, lateral (20) and oral (21) views.