Adelosina d’Orbigny 1826

Mamo, Briony L., 2016, Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215 (1), pp. 1-123 : 24-25

Adelosina d’Orbigny 1826

Adelosina carinatastriata ( Wiesner 1923) ( Figs 6 :1–7)

1923 Adelosina miletti Wiesner var. carinatastriata Wiesner , p. 76.

1991 Adelosina carinata-striata Wiesner; Cimerman and Langer, p. 28, pl. 20, figs 1–4. 1992 b Quinqueloculina funafutiensis (Chapman) ; Hatta & Ujiié, p. 66, pl. 7, fig. 5a–b. 1994 Quinqueloculina funafutiensis (Chapman) ; Loeblich & Tappan, p. 49, pl. 77, figs 13–15. 1995 Quinqueloculina tasmanica Albani ; Yassini & Jones, p. 85, fig. 217.

1999 Quinqueloculina tenagos Parker ; Hayward et al., p. 104, pl. 5, figs 14, 15. 2001 Adelosina carinatastriata Wiesner ; Gross (in Costello), p. 66.

2001 Quinqueloculina funafutiensis (Chapman) ; Lobegeier, p. 292, figs 17, 18. 2007 Quinqueloculina carinatastriata (Wiesner) ; Bouchet et al., p. 205, pl. 1.

2009 Quinqueloculina carinatastriata (Wiesner) ; Parker, p. 188, figs 133a–h, 134a–h. 2012 Quinqueloculina carinatastriata (Wiesner) ; Debenay, p. 120, pl. 7.

Description. See Hayward (1999, Hayward et al., p. 104, pl. 5, figs 14, 15), Loeblich & Tappan (1994, p. 49, pl. 77, figs 13–15) and Parker (2009, p. 188, figs 133a–h, 134a–h).

Remarks. The specimens assigned to Adelosina carinatastriata Wiesner 1923 from the CG have the characteristic peripheral carina and oblique costae that run the longitudinal length of the test. The terminal aperture is circular to oval in shape and sits atop a short neck and has a single tooth. The chambers are slightly inflated with distinct, oblique sutures ( Fig. 6 :1–7). Gross (in Costello 2001) considers the most common name, Quinqueloculina carinatastriata , an erroneous and invalid name and this is supported by the World Foraminifera Database (2015).

The type specimens published by Wiesner (1923) and those illustrated in subsequent publications ( Hatta & Ujiié 1992b, p. 66, pl. 7, fig 5a–b; Loeblich & Tappan 1994, p. 49, pl. 77, figs 13–15; Parker 2009, p. 188, figs 133a–h, 134a–h) have chambers where the peripheral carina is quite variable in size. Some specimens clearly possess a distinct carina protruding and running the length of the test periphery, whilst others possess a carina no thicker than adjacent costae making such specimens difficult to identify. This intraspecific variation is exemplified by the two distinct morphotypes referred to by Parker (2009), one with a distinct carina and the other which essentially lacks a carina. Specimens collected from the CG are somewhat similar with some possessing distinct carina ( Fig. 6 :3–7) and others indistinct ( Fig. 6 : 1, 2). Adding to confusion, this species has been most commonly published under the genus Quinqueloculina due to its adult chamber arrangement but its early chamber arrangement and its produced, terminal aperture on a short neck should be placed in Adelosina ( Wiesner, 1923; World Foraminifera Database, 2015).

Due to the great variation in the expression of the peripheral carina this species has been described under several different names. Hatta & Ujiié (1992b), Loeblich & Tappan (1994) and Lobegeier (2001) assigned specimens to Quinqueloculina funafutiensis ( Chapman 1901) . Whilst Loeblich & Tappan’s (1994) specimens display a distinct peripheral carina, the test shape is much more elongate and the chambers are less inflated than the specimens from the CG and those described by Cimerman & Langer (1991), Hatta & Ujiie (1992b), Boucet et al. (2007), Parker (2009) and Debenay (2012). Yassini & Jones (1995) identified some specimens as Quinqueloculina tasmanica Albani 1978 but that species has a more elongate neck and a slightly narrower aperture ( Hatta & Ujiié 1992b). The morphological variety of A. carinatastriata and Q. tasmanica and their distribution is further explored by Bouchet et al. (2007). Specimens identified as Quinqueloculina tenagos Parker 1962 by Hayward et al. (1999) are morphologically very similar to Q. carinatastriata documented by Parker (1962, p. 110) from the CG except for the absence of a distinct peripheral carina.

Adelosina carinatastriata was originally collected from Cervera Bay in the eastern Adriatic Ocean from a depth of 1 m and from northwest of Lucietta Island, within the eastern Adriatic at a depth of 120 m ( Wiesner 1923) and has a global distribution (Adriatic shallow soft sediments—Cimerman & Langer 1991; Ryukyu Island Arc— Hatta & Ujiié 1992b; Sahul Rise and Western Timor Sea from 86–274 m—Loeblich & Tappan 1994; Broken Bay, Hawkesbury River estuary—Yassini & Jones 1995; North Island and Christchurch, New Zealand—Hayward et al. 1999; Green Island, GBR—Lobegeier, 2001; Ningaloo Reef—Parker 2009; French Atlantic coast—Bouchet et al. 2007; New Caledonia from 20 m—Debenay 2012).

Distribution within study area. Adelosina carinatastriata was not found at Sykes Reef nor along the transects across Heron Reef flat. However, they were found in relative high abundance within the sampled lagoons. The most abundant samples being site 20 in Wistari Lagoon and site 39 in Heron Lagoon. One live specimen of A. carinatastritata was collected from site 54 in One Tree Lagoon 1.

Figures

FIGURE 6. (Unless otherwise specified all scale bars = 100 µm). 1 – 7. Adelosina carinatastriata Wiesner, 1923. 1 – 2. QM # G 466097 from WL 21, lateral view (1) and oral (2) views. 3 – 5. QM # G 465820 from OTI 36, lateral (3), peripheral (4) and oral views (5). 6 – 7. QM # G 465919 from WL 7, lateral (6) and oral (7) views. 8 – 13. Adelosina cf. A. pulchella (d’Orbigny, 1826). 8 – 10. QM # G 466087 from ST / HW 10 lateral view (8), oral view (9) and peripheral view (10). 11 – 13. QM # G 466067 from HL 40 lateral views (11, 12) and oral view (13). 14 – 17. Spiroloculina angulata Cushman, 1917. 14 – 15. QM # G 465824 from OTI 36 lateral view (14) and oral view (15). Scale bars = 50 µm. 16 – 17. QM # G 466066 from T 3 – 6 lateral (16) and oral (17) views. 18 – 19. Spiroloculina corrugata Cushman & Todd 1944, QM # G 466059 from OTI 39. 18. Lateral view. 19. Peripheral view. 20 – 21. Spiroloculina cf. S. depressa d’Orbigny, 1826, QM # G 465893 from ST / HW 8. 20. Lateral view 21. Oral view.