Neoconorbina

Mamo, Briony L., 2016, Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215 (1), pp. 1-123 : 82-83

Neoconorbina sp. 1 ( Fig. 19 :17–21)

Remarks. These specimens were assigned to Neoconorbina due to their low concical trochospiral test that is circular in outline. The spiral side is convex and densely perforated with an imperforate keel and the umbilical side is flat. The sutures on the spiral test side are strongly curved and limabte with fine pustules. Sutures are depressed on the umbilical side with an open umbilicus and aperture beneath a plate-like folium ( Fig. 19 :17–21).

The material collected from the CG bears strong similarity to the specimens published by Debenay (2012) under Neoconorbina sp. 1 from New Caledonia, and they are likely conspecific. There is also some similarity with Neoconorbina terquemi ( Rzehak 1888) published by Hayward et al. (1999) from the Kermadec Islands but CG specimens lack such an acute periphery, the umbilical side is flat rather than concave and the early subglobular chambers on the spiral side are more distinct.

Distribution within study area. Neoconorbina sp. 1 was collected from Heron, Wistari, One Tree and Sykes Reefs, but never with an abundance of more than five specimens per sample. One Tree Reef had the highest abundance (site 47, Lagoon 3) and Heron Lagoon the lowest. This species was also one of the few that was alive at the time of collection. Although only six live specimens were collected, they were all from either Wistari or One Tree Lagoons with no more than one live specimen per site.

Figures

FIGURE 19. (Unless otherwise specified all scale bars = 100 µm). 1 – 2. Uvigerina cf. U. porrecta Brady, 1879, QM # G 465988 from OTI 51. Scale bar = 50 µm. 1. Lateral view. 2. Oral view. 3 – 4. Trifarina pacifica (Albani, 1974), QM # G 465989 from OTI 51. Scale bar = 50 µm. 3. Lateral view. 4. Oral view. 5 – 6. Fijiella simplex (Cushman, 1929), QM # G 465828 from OTI 39. 5. Lateral view. 6. Oral view. 7 – 10. Eponides cf. E. repandus (Fichtel & Moll, 1798), 7. QM # G 465880 from CHANNEL, scale bar = 200 µm. 7. Spiral view. 8. Peripheral view. 9. QM # G 465881 from CHANNEL, umbilical view. Scale bar = 500 µm. 10. QM # G 465872 from CHANNEL, umbilical view. Scale bar = 200 µm. 11 – 13. Orbitina parri Collins, 1974, QM # G 466000 from OTI 47. Scale bar = 50 µm 11. Spiral view. 1 2. Umbilical view. 13. Peripheral view. 1 4 – 16. Rotorbis cf. R auberii (d’Orbigny, 1839). 1 4. QM # G 465914 from OTI 53 spiral view, scale bar = 50 µm. 1 5 – 16. QM # G 465915, umbilical view (15) peripheral view (16), scale bar for 16 = 50 µm. 1 7 – 21. Neoconorbina sp. 1. 17 – 18. QM # G 466138 from ST / HW 8, spiral (17) and peripheral (18) views. Scale bar = 50 µm. 19 – 21. QM # G 466008 from OTI 47, spiral (19), peripheral (20) and umbilical (21) views. Scale bar for 19 and 20 = 50 µm.