Siphogenerina Schlumberger 1882 ( Milne-Edwards 1882 )

Mamo, Briony L., 2016, Benthic Foraminifera from the Capricorn Group, Great Barrier Reef, Australia, Zootaxa 4215 (1), pp. 1-123 : 78-79

Siphogenerina Schlumberger 1882 ( Milne-Edwards 1882)

Siphogenerina raphana (Parker & Jones 1865) ( Fig. 18 :20, 21)

1865 Uvigerina (Sagrina) raphanus Parker & Jones , p. 354, pl. 18, figs 16, 17.

1884 Sagrina raphanus (Parker & Jones) ; Brady, p. 585, pl. 75, figs 21–24.

1932 Siphogenerina raphanus (Parker & Jones) ; Parr, p. 225, pl. 21, fig. 24.

1978 Rectobolivina raphana (Parker & Jones) ; Cheng & Zheng, p. 204, pl. 18, figs 13–15. 1993 Siphogenerina raphana (Parker & Jones) ; Haig, p. 170, pl. 3, figs 8–10.

1994 Siphogenerina raphana (Parker & Jones) ; Loeblich & Tappan, p. 123, pl. 240, figs 1–11. 2009 Siphogenerina raphana (Parker & Jones) ; Parker, p. 469, fig. 338a–j.

2012 Siphogenerina raphana (Parker & Jones) ; Debenay, p. 169, pl. 11.

Description. See Parker (2009, p. 469, fig. 338a–j) and Parker & Jones (1865, p. 354, pl. 18, figs 16, 17).

Remarks. Siphogenerina raphana (Parker & Jones 1865) is characterised by an elongate, cigar-shaped test with a uniserial chamber arrangement and strong, radiating costae. The chambers are finely perforate, but the perforations are absent over and around the depressed sutures. The terminal apertures have a thick lip that extends around and down into the test. The aboral end is rounded and chambers are slightly inflated ( Fig. 18 :9, 10).

The strength of the costate ornament of S. raphana is highly variable. Capricorn Group specimens tended to possess costae that fluctuated in definition along the test’s length, as similarly seen in Parker’s (2009, fig. 338) specimens. The development of the thick apertural lip is also particularly variable, ranging from thin, produced and with a distinct neck ( Brady 1884; Parr 1932a; Loeblich & Tappan 1994), to thick and only partially encircling the aperture and not produced. These latter forms are evident in CG collections ( Fig. 18 :10) and others ( Cheng & Zheng 1978; Haig 1993; Loeblich & Tappan 1994; Parker 2009; Debenay 2012).

No type locality has been designated for this species, but it has a widespread distribution ( West Indies , Panama, India, Hong Kong and Australia—Ellis & Messina 1940; Bass Strait from 69–72 m, Admiralty Islands from 29–46 m, Philippines 174–183 m, Tahiti from 768 m—Brady 1884; Victorian coast, Australia—Parr 1932a; Xisha Islands—Cheng & Zheng 1978; Papuan Lagoon—Haig 1993; Sahul Banks from 22–271 m, western Timor Sea from 86–146 m—Loeblich & Tappan 1994; Ningaloo Reef—Parker 2009; Bay of Prony from 10–30 m— Debenay 2012). Quilty (1977) listed specimens as Rectobolivina raphanus (Parker & Jones, 1865) from mobile sand bar sediments at Hardy Inlet, south Western Australia and Haig (1997) from Exmouth Gulf, Western Australia .

Distribution within study area. Siphogenerina raphana was collected from all sampled reefs, except Sykes Reef. It was particularly abundant at site 19 in Wistari Lagoon, but it was most frequently collected from One Tree Lagoons 1 and 2. This taxon was absent from Heron Lagoon, but was found on Heron Reef flat in low numbers (one specimen per site).

Figures

FIGURE 18. (Unless otherwise specified all scale bars = 100 µm). 1 – 3. Abditodentrix rhomboidalis (Millett, 1899), scale bar = 50 µm. 1 – 2. QM # G 465946 from OTI 43, lateral (1) and oral (2) views. 3. QM # G 465932 from OTI 1, lateral view. 4 – 9. Bolivina variabilis (Williamson, 1858). 4 – 5. QM # G 466137 from OTI 43, scale bar = 50 µm, lateral (4) and oral (5) views. 6 – 7. QM # G 465933 from OTI 8, lateral (6) and oral (7) views. Scale bar for 7 = 200 µm. 8 – 9. QM # G 465935 from OTI 8, lateral (8) and oral (9) views. 10 – 11. Sagrinella jugosa (Brady, 1884), QM # G 465975 from OTI 47. Scale bar = 50 µm 10. Lateral view. 11. Oral view. 12 – 13. Rugobolivinella elegans (Parr, 1932), QM # G 465941 from OTI 20. 12. Lateral view. 13. Oral view. 14 – 15. Loxostomina limbata (Brady, 1884), QM # G 465829 from OTI 39. 14. Lateral view. 15. Oral view. 16 – 17. Favocassidulina favus (Brady, 1877), QM # G 465948 from OTI 47. Scale bar = 50 µm. 16. Spiral view. 17. Umbilical view. 18 – 19. Globocassidulina bisecta Nomura, 1983, QM # G 466001 from OTI 47. Scale bar = 50 µm. 18. Lateral view. 19. Oral view. 20 – 21. Siphogenerina raphana (Parker & Jones, 1865), QM # G 465787 from ST / HW 2. 20. Lateral view, scale bar = 200 µm. 21. Oral view.