Subbotina utilisindex Jenkins & Orr 1973 (TaxonConcept

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Species Subbotina utilisindex Jenkins & Orr 1973

Diagnosis / Definition:

Pearson et al. (2006):
DESCRIPTION. Type of wall: Spinose, cancellate, normal perforate, sacculifer/ruber-type wall. Test morphology: Test trilobate, equatorial margin rounded; chambers coiled in compact, low trochospire, globular, final chamber comprising less than half of test; sutures radial to slightly curved, moderately depressed; umbilicus narrow, shallow; aperture a very low interiomarginal, umbilical-extraumbilical slit bordered by a narrow lip. Size: Holotype maximum diameter 0.37 mm.

Discussion / Comments:

Spezzaferri & Silva (1990):
The main characteristics of this species are the much more round final chamber and fner wall structure than S. linaperta s. str. (see Premoli Silva and Spezzaferri, 1990). Subbotina utilisindex disappears in the middle Oligocene just prior to S. angiporoides and S. angiporoides minima.
Pearson et al. (2006):
DISTINGUISHING FEATURES.- Differs from Subbotina linaperta (Finlay) by (1) the more compact coiling, (2) more equidimensional size of final whorl chambers, (3) lower apertural arch and more umbilical position of the aperture, (4) less developed apertural lip, and (5) less coarsely cancellate wall texture. Differs fiom S. angiporoides by not possessing an enveloping final chamber. DISCUSSION.- Jenkins and Orr (1973) considered S. utilisindex to be morphologically intermediate between S. linaperta and S. angiporoides. PHYLOGENETIC RELATIONSHIPS.- Probably descended from S. linaperta during the late Eocene. GEOGRAPHIC DISTRIBUTION.- Cosmopolitan particularly common in early Oligocene assemblages at southern, latitudes. It may have been adapted to cold, nutrient-rich waters. STABLE ISOTOPIC PALEOBIOL0GY.- Poore and Matthews (1984) and Wade and Kroon (2002) recorded this species as having ò18O values intermediate between surface dwelling and benthic species, indicating a deep planktonic habitat.

Systematics:

22
Genus Subbotina
  Genus Turborotalia
   Informal Group Subbotina angiporoides
    Species Subbotina praeturritiliana
     Species Subbotina utilisindex

35
  Ordo Foraminiferida
   Superfamilia Globigerinaceae
    Familia Globigerinidae
     Genus Subbotina
      Species Subbotina angiporoides
       Species Subbotina utilisindex

Synonym list:

Spezzaferri & Silva (1990):

1973 Globigerina utilisindex Jenkins & Orr. - Jenkins & Orr :

1973 Globigerina utilisindex Jenkins & Orr. - Jenkins & Orr : pl. 1, fig. 1-6; pl. 2, fig. 1-9; pl. 3, fig. 1-3

1990 Subbotina utilisindex Jenkins & Orr. - Spezzaferri & Silva : p.258 pl. XVI; fig. 4a-d

Pearson et al. (2006):

1971 "Globigerina" sp. A . - Beckmann : p.719 pl. 1; fig. 1-4 [lower Oligocene, DSDP Sites 69, 70, 72, eastern equatorial Pacific]

1973 Globigerina utilisindex Jenkins & Orr. - Jenkins & Orr : p.1089 pl. 10; fig. 6-8 [lower Oligocene, DSDP Hole 77B, eastern equatorial Pacific]

1991 Subbotina utilisindex Jenkins & Orr. - Huber : p.441 pl. 5; fig. 6 [lower Oligocene, ODP Site 738, Kerguelen Plateau, southern Indian Ocean]

1992 Subbotina angiporoides Hornibrook. - Berggren : pl. 4, fig. 5-8 [upper Eocene Globorotaloides suteri Zone, ODP Hole 748B, Kerguelen Plateau, southern Indian Ocean]. [Not Finlay, 1 939.]

2006 Subbotina utilisindex Jenkins & Orr. - Pearson et al. : p.128 pl. 6.6; fig. 14-20

References:

Beckmann,J.P. (1971):
The foraminifera of Sites 68 to 75.
In: Initial Reports of the Deep Sea Drilling Project Vol. 8 Eds: Tracey, J.J.I..and others p. 713-726

Jenkins,D.G. and Orr,W.N. (1973):
Globigerina utilisindex n. sp. from the Upper Eocene-Oligocene of the eastern equatorial Pacific . J. Foraminiferal Res. Vol. 3(3) p. 133-135

Spezzaferri,S. and Silva,I.S.. (1990):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263

Huber,B.T. (1991):
Paleogene and early Neogene planktonic foraminifer biostratigraphy of Sites 738 and 744, Kerguelen Plateau (southern Indian Ocean).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 119 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 427-449

Berggren,W.A. (1992):
Paleogene Planktonic Foraminifera Magnetobiostratigraphy of the Southern Kerguelen Plateau (Sites 747-749).
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 120

Pearson,P.N.; Olsson,R.K.; Hemleben,C.; Huber,B.T. and Berggren,W.A. (2006):
Atlas of Eocene Planktonic Foraminifera. p. 1-513

Anonymous: Unedited TaxonConcept data

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