Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia Author Mamo, Briony L. text Zootaxa 2016 4215 1 1 123 journal article 37169 10.11646/zootaxa.4215.1.1 0087fa4c-a4f0-45d9-a2de-d433d7885753 1175-5326 272923 B91D1782-C11A-4CDC-96B6-76104FEE51BD Rudigaudryina Cushman & McCulloch 1939 Rudigaudryina minor ( Chapman 1902 ) ( Fig. 3 :18–20; Fig. 4 :1–3) 1902 Haddonia minor Chapman , p. 384, pl. 36, figs 1–2. 1987 Haddonia minor Chapman ; Baccaert, p. 11, pl. 3, fig. 5; pl. 4, figs 1–5. 2001 Rudigaudryina minor (Chapman) ; Lobegeier, p. 285, pl. 3, figs 5–9. 2009 Rudigaudryina minor (Chapman) ; Parker, p. 32, fig. 26a–c, 27a–f. Description. Rudigaudryina is typified by an early triserial test stage (at least in microspheric forms) that becomes biserial and then in adult forms gains an irregular chamber arrangement with more inflated and broad final chambers ( Fig. 3 :18–20). Walls are finely arenaceous, firmly and smoothly cemented. Aperture is generally terminal or found near the base of the final chamber, rounded and occasionally with a slight lip ( Cushman & McCulloch 1939 ; Loeblich & Tappan 1987 ; Parker 2009 ). Rudigaudryina minor ( Chapman 1902 ) is characterised as either a free ( Fig. 3 :18–20; Fig. 4 :1–3) or an attached test by its earlier segments and a slight horse-shoe shaped aperture ( Fig. 4 :2). Remarks. These specimens were assigned to this species due to their initial triserial stage which becomes biserial, and often irregular and inflated chamber arrangement. Also, due to their sometimes attached, agglutinated test and slightly horse-shoe shaped terminal aperture. The distribution of R . minor is circumtropical ( Funafuti Tuvalu , Galapagos Islands , Bay of Jakarta and the Great Barrier Reef—Parker 2009) and is reported as both a free and attached species to Halimeda algae and larger carbonate reef rubble. Due to this, the characteristic triserial stage of this species can be difficult to discern in some instances ( Parker 2009 ). Distribution within study area. Rudigaudryina minor was collected from all areas across both reef flat and lagoons in relatively low numbers (1– 14 specimens per sample). It was most abundant in One Tree Lagoon 2 and along Transect 1, which runs along the boundary between the inner and outer reef flats at Heron Island.