Abditodentrix (Mamo, Briony L. 2016)
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- Abditodentrix Mamo, Briony L., 2016, Zootaxa 4215: 74-75.
1992a Brizalina? rhomboidalis (Millett); Hatta & Ujiié, p. 172, pl. 26, fig. 2. 1993 “ Bolivinita ” rhomboidalis (Millett); Haig, p. 171, pl. 6, figs 14–16. 1994 Tortoplectinella rhomboidalis (Millett); Loeblich & Tappan, p. 113, pl. 216, figs 1–6. 2002Tortoplectinella rhomboidalis (Millett); Bicchi et al., p. 282, fig. 7:18. 2000 Abditodentrix rhomboidalis (Millett); Revets, p. 371, pl. 2, fig. 44. 2009 Abditodentrix rhomboidalis (Millett); Parker, p. 427, fig. 308a– i. 2012Abditodentrix rhomboidalis (Millett); Debenay, p. 170, pl. 12. Description. See Millett (1899, p. 559, pl. 7, fig. 4) and Parker (2009, p. 427, fig. 308a–i).
Remarks.Abditodentix rhomboidalis (Millett 1899) is characterised by a biserial chamber arrangement, subquadrilateral cross section, and flattened, perforate test walls. The perforations are particularly well developed on the final chambers and around the sutures of the initial chambers. The top of the final chambers are ornamented by a thickened test wall that has a meandering crenulated pattern and the sutures are raised and thickened. The aperture consists of a basal loop shape with a lip that only borders one side of the aperture and folds around to become a tooth plate that extends down the centre of the aperture (Fig. 18:1–3). Despite placement in various genera, this species is placed in Abditodentrix due to its truncated margins and aperture possessing a lip that only partially extends around the apertural margin (Patterson 1985; Parker 2009). The only difference between the CG specimens and other published examples of this taxon, is the less pronounced twisting of the final chambers (Hatta & Ujiié 1992a; Loeblich & Tappan 1994; Parker 2009). Millett , New Caledonia Bay of Prony .
Distribution within study area.Abditodentrix rhomboidalis only occurred in small numbers (one to five specimens per site) in lagoon and reef flat samples of the CG. However, abundance is greatly increased in the channel sample with thirty specimens from a single site. This distribution matches other documented occurrences of this species which is known to favour deeper water environments compared to shallower reef flat and lagoon settings.
- Mamo, Briony L.; 2016: Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215: 74-75. doi