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Species Globoturborotalita ouachitaensis Howe & Wallace 1932


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Cancellate, normal perforate, spinose, sacculijer-type wall structure. Test morphology: Test moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 4 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, sutures depressed, straight; in umbilical view 4 globular, slightly embracing chambers, increasing moderately in size, sutures depressed, straight, umbilicus large, open, enclosed by surrounding chambers, aperture umbilical, a rounded arch, bordered by thickened rim; in edge view chambers globular in shape, slightly embracing, initial spire of chambers slightly elevated. Size: Maximum diameter of holotype 0.19 mm.
Discussion / Comments:
Pearson et al. (2006):
DISTINGUISHING FEATURES.- This specics is characterized by its small size, 4 globular, slightly embracing, chambers in the ultimate whorl, umbilical aperture, and cancellate, spinose wall texture. It is distinguished from G. bassriverensis by lacking the thick, prominent lip of that species. DISCUSSION.- Globoturborotalita ouachitaensis first appears in the middle Eocene where it is a minor component of planktonic foraminiferal assemblages. It is apparently the stem species for the late Eocene radiation of Globoturborotalita. Globigerina turcmenica of Khalilov (1 956) may be a synonym, but due to confusion over the specimens in the collections of Khalilov that are not the same as the illustration of the holotype, and the apparent loss of the holotype, it is recommended that turcmenica be considered nomen dubium non consewandum. PHYLOGENETIC RELATIONSHIPS.- Globoturborotalita ouachitaensis is derived fiom Globoturborotalita bassriverensis n. sp. by an increase in the size of the aperture and a reduction of the umbilical lip in G. bassriverensis to an umbilical rim. Conical spine bases for support of spines are observed in G. ouachitaensis and may represent a further porphological adaptation. GEOGRAPHIC DISTRIBUTION.- Distributed in mid to low latitudes. STABLE ISOTOPE PALEOBIOLOGY.- No Eocene data are currently available.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Globigerinidae
    Genus Globoturborotalita
     Species Globoturborotalita ouachitaensis
Synonym list:
Pearson et al. (2006):
p 1932 Globigerina ouachitaensis Howe & Wallace. - Howe & Wallace : p.74 pl. 10; fig. 5a-b [upper Eocene, Jackson Fm., Danville Landing, Louisana]
1962 Globigerina ouachitaensis ouachitaensis Howe & Wallace. - Blow & Banner : p.90 pl. 9; fig. D, H-K [lower Oligocene Globigerina oligocaenica Zone, Sample FCRM 1627, Lindi area, Tanzania]
1970 Globigerina ouachitaensis Howe & Wallace. - Samanta : p.191 pl. 1; fig. 10-12 [middle Eocene Zone E1 2, Lakhpat, Cutch, western India]
1970 Globigerina officinalis Subbotina. - Samanta : p.191 pl. 1; fig. 2, 3 [middle Eocene Zone E12, Lakhpat, Cutch, western India]. [Not Subbotina, 1953 .]
1970 Globigerina praebulloides occlusa Blow & Banner. - Samanta : p.191 pl. 1; fig. 5, 6 [middle Eocene Zone E12, Lakhpat, Cutch, western India]
1980 Globigerina praebulloides occlusa Blow & Banner. - Charollais et al. : p.64 pl. 6; fig. 5-7 [lower Oligocene, France]. [Not Blow and Banner, 1962.]
1991 Globigerina ouachitaensis Howe & Wallace. - Spezzaferri & Premoli Silva : p.237 pl. 6; fig. 5a-c [upper Oligocene Zone 06, DSPD Hole 538A, Gulf of Mexico]
2001 Globigerina ouachitaensis Howe & Wallace. - Warraich & Ogasawara : p.46 fig. 15: 3-5 [Zone E14, Kirthar Fm., Sulaiman Range, Pakistan]
2006 Globoturborotalita ouachitaensis Howe & Wallace. - Pearson et al. : p.127 pl. 6.5; fig. 1-16
Specimen:
Smithsonian Museum of Natural History, Washington, D.C., Inventory number: USNM CC18946
References:

Howe,H.V. and Wallace,W.E. (1932):
Foraminifera of the Jackson Eocene at Danville Landing on the Ouachita, Catahoula Parish, Louisiana . Bull. Louisiana Dept. Conservation Geol. Vol. 2 p. 18-79

Blow,W.H. and Banner,F.T. (1962):
The Mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae.
In: Fundamentals of Mid‑Tertiary Stratigraphical Correlation Eds: Eames, F.E.Banner, F.T.Blow, W.H.Clarke, W.J. p. 61‑151

Samanta,B.K. (1970):
Middle Eocene Planktonic Foraminifera from Lakhpat, Cutch, Western India . Micropaleontology Vol. 16

Charollais,J..; Hochuli,P..; Oektlt,H..; Perch-Nielsen,K.; Toumarkine,M.; Rögl,F. and Pajris,-.J.. (1980):
Les Marnes Foraminiféres et les Schistes a Meletta des Chaines Subalpines septentrionales (Haute-Savoie, France) . Eclogae Geologicae Helvetiae Vol. 73 p. 9-69

Spezzaferri,S. and Premoli Silva,I. (1991):
Oligocene planktonic foraminiferal biostratigraphy and paleoclimatic interpretation from Hole 538A, DSDP Leg 77, Gulf of Mexico . Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 83 p. 217-263

Warraich,M.Y.. and Ogasawara,K.. (2001):
Tethyan Paleocene-Eocene planktic foraminifera from the Rakhi Nala and Zinda Pir land sections of the Sulaiman Range, Pakistan . Science Reports of the Institute of Geoscience University of Tsukuba, section B Vol. 22 p. 1-59

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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