Catalog - Candeina antarctica

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Candeina antarctica

Citation: Candeina antarctica Leckie & Webb 1985

Type specimens: P1. 1, Figs. 1-17; P1. 2, Figs. 1.-9; P1. 3., Figs. 3, 6, 8; The holotype (USNM 385215, figured paratypes (USNM 385216, 385218) and unfigured paratype (USNM 385217) are deposited in the collections of the National Museum of Natural History, SmithsonianInstitution, Washington,DC. Some of the other paratypes will be deposited at the New Zealand Geological Survey, Lower Hutt, N.Z. The remaining paratypes will be retained by the authors.

Type sample (& lithostrat): DSDP 270-34-2 28-38cm

Type locality: Holotype (pl. I, figs. l, 2) and unfigured paratype (no. 385217) from core 34-3, 28-38 cm; paratype (pl. I, figs. 3, 4) from core 35-3, 112-121 cm; paratype (pl. I, figs. 5, 6, pl. 2, figs. 2, 6, 9) from core 37-4, 133-142 cm; paratype (pl. I, fig. 7) from core 15 CC; paratype (pl. I, figs. 8, 9) from core 33-3, I 02-110 cm; two paratypes (pl. I, fig. 10; fig. II, pl. 2, fig. l) from core 25-2, 50-60 cm; paratype (pl. I, fig. 12) from core 21-4, 102-110 cm; paratype (pl. I, fig. 13, pl. 2, figs. 4, 7) from core 13-3, 114-125 cm; five paratypes (pl. I, figs. 14-16; pl. 2, fig. 3; pl. 3, fig. 6) from core 39-6, 24-36 cm; paratype (pl. I, fig. 17) from core 26-4, 100-114 cm; paratype (pl. 2, fig. 5) from core 21-5, I 02-112 cm; paratype (pl. 2, fig. 8) from core ~7-4, 108-118 cm; all from DSDP site 270 (lat. 77°26.48' S., long. 178°30. 19' W.), water depth of 634 m, southeastern Ross Sea, Antarctica. Paratype (pl. 3, fig. 3) from 21-A and paratype (pl. 3, fig. 8) from Webb 14, both at RISP Station J9 (lat. 82°22.5' S., long. 168°37.5' W.), northwestern Ross Sea (Webb, 1979, RISP Technical Report, no. 79-1, p. 24). Also found in the Ross Sea at DSDP site 273 (lat. 74° 32.29' S., long. 174°37.57' E.), water depth of 495 m and at McMurdo Sound site MSSTS1 (Webb, 1983, in: Oliver, James and Jago (Eds), Antarctic Earth Science. Cambridge: Cambridge University Press, p. 560).

Type repository: Washington, USNM

Test small, free, low trochospiral coil, equatorial periphery lobate, axial periphery rounded; test calcareous, smooth, finely perforate, and very thin; chambers spherical, increasing gradually in size as added. 8-10 most common in adult, arranged in one and one-half to two and one-half whorls; with three and one half to five chambers in ultimate whorl, four being most common (pl. 1, figs. 1-13) and three to three and one-half most typical in penultimate whorl (pl. 1, figs. 14-17); sutures depressed, radial to slightly curved on spiral side, radial and pustulose on umbilical side; umbilicus closed; primary aperture interiomarginalumbilical in early stages (fig. 15); adult test with multiple sutural supplementary apertures confined to umbilical side; supplementary apertures generally elongate parallel to the sutures; bar-like partitions may separate sutural apertures but more typically, flat bridge-like structures span suture (pl. I. figs. I. 12; pl. 2, figs. 4, 7); sutural bullae sometimes observed (pl. I, figs. 6, II; pl. 2, figs. I, 2).

Discussion. Candeina antarctica, n. sp., differs from C. nitida d'Orbigny (late Miocene to Recent) in being smaller, having fewer chambers, possessing a low trochospiral form, and well-developed sutural pustulation on the umbilical side. The multiple sutural apertures are restricted to the umbilical side in C. antarctica. The sutural apertures of C. nitida are discrete, oval-shaped openings surrounded by a thickened rim (Pl. 3, Fig. 13). Such features are not observed in C. antarctica.

Candeina antarctica, n. sp., is morphologically similar to C. cecionii Cañon and Ernst and C. zeocenica Hornibrook and Jenkins. The main distinguishingfeatures of C. antarctica are its low, flatter (relative to C. zeocenica) quadrilobate form, supplementary sutural apertures confined to the umbilical side, and development of pustules in the umbilicus and along the umbilical sutures.

Stratigraphic range. At present known only from the Ross Sea basins, Antarctica; latest Oligocene-early Miocene of DSDP Site 270 (Leckie and Webb, 1980, 1983), Oligocene-early Miocene of drillhole MSSTS-1 (Webb, 1983), early to middle Miocene of DSDP Site 273 (D'Agostino and Webb, 1980, D'Agostino, 1980) and middle Miocene RISP Site J9 (Webb, 1979a).

Type specimens.

This species is now regarded as benthic and was placed in a spearate genus Antarcticella by Loeblich & Tappan 1988. See also Malumian et al. 2010

References:

Leckie, R. M. & Webb, P. (1985). Candeina antarctica, n. sp. and the phylogenetic history and distribution of Candeina spp. In the Paleogene-Early Neogene of the Southern Ocean. Journal of Foraminiferal Research. 15(2): 65-78. gs

Loeblich, A. R. & Tappan, H. (1988). Foraminiferal Genera and Their Classification (Volume I-II). Van Nostrand Reinhold Co., New York. 1-1059. gs

Malumián, N., Náñez, C. & Jannou, G. (2010). Antarcticella: a Paleogene typical foraminiferal genus from southernmost South America. In, X Congreso Argentino de Paleontología y Bioestratigrafía y VII Congreso Latinoamericano de Paleontologíal La Plata. -. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Candeina antarctica Leckie & Webb 1985

Candeina antarctica

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