Trochammina Parker & Jones 1859

Mamo, Briony L., 2016, Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215 (1), pp. 1-123 : 15

Trochammina Parker & Jones 1859

Trochammina sp. cf. T. subconica ( Parr 1950) ( Fig. 3 :13, 14)

Description. See Parr (1950; p. 281, pl. 5, fig. 22).

Remarks. Specimens collected from the CG match the original description for this species with a compact test, conical, inflated chambers that are coarsely arrenaceous, strongly depressed sutures and an arched aperture at the inner margin of the final chamber. Despite this, whilst T. subconica is decribed as triserial, a majority of reported specimens possess four chambers in their final whorl ( Parr 1950). Collected specimens from the CG were damaged and a dominance of four chambers was not found, though this may be due to the small number of specimens collected. For this reason only tentative assignment has been made.

Distribution within study area. Trochammina subconica Parr 1950 only occurred in Heron and One Tree Lagoons and the channel with no more than three specimens per site (One Tree Lagoon 2, site 50).

Figures

FIGURE 3. (Unless otherwise specified all scale bars = 100 µm). 1 – 3. Reophax nana Rhumbler, 1911, QM # G 465920 from WL 7. 1. Lateral view, scale bar = 200 µm. 2. Oblique oral view, scale bar = 200 µm. 3. Close-up oral view, scale bar = 20 µm. 4. Ammobaculites sp. 1, QM # G 465924 from WL 15. Lateral view. 5 – 12. Rotaliammina chitinosa (Collins, 1958). 5 – 6. QM # G 466031 from T 2 – 5, spiral (5) and close-up spiral (6) views. Scale bar for 5 = 1 mm. 7 – 8. QM # G 465776 from ST / HW 2, spiral (7) and close-up spiral (8) views. Scale bar for 7 = 500 µm. 9 – 10. QM # G 466022 from T 1 – 4 spiral (9) and close-up spiral (10) views. Scale bar for 9 = 500 µm. 11. QM # G 465940 from OTI 20, spiral view. 12. QM # G 466054 from CHANNEL, umbilical view. Scale bar = 50 µm. 13 – 14. Trochammina cf. T. subconica (Parr, 1950), QM # G 465937 from OTI 50. 13. Lateral view. 14. Oral view. 15 – 16. Bdelloindina cf. B. aggregata Carter, 1877, QM # G 466025 from T 1 – 2. 15. Lateral view, scale bar = 200 µm. 16. Close-up lateral view, scale bar = 50 µm. 17. Haddonia torresiensis Chapman, 1898, QM # G 465906 from ST / HW 2, lateral view. Scale bar = 500 µm. 18 – 20. Rudigaudryina minor (Chapman, 1902). 18. QM # G 465960 from OTI 50, lateral view. Scale bar = 500 µm. 19. QM # G 465891 from ST / HW 8, lateral view. Scale bar = 500 µm. 20. QM # G 465826 from OTI 39, lateral view. Scale bar = 500 µm.