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Species Globoturborotalita anguliofficinalis Blow 1969


Diagnosis / Definition:
Pearson et al. (2006):
DESCRIPTION. Type of wall: Cancellate, normal perforate, spinose, sacculifer-type wall structure. Test morphology: Moderately low trochospiral, globular, lobulate in outline, chambers globular; in spiral view 41/2-5 globular, slightly embracing chambers in ultimate whorl, increasing moderately in size, sutures depressed, straight; in umbilical view 4112-5 globular, slightly embracing chambers, increasing moderately in size, sutures depressed, straight, umbilicus small, open, enclosed by surrounding chambers, aperture umbilical, a low rounded arch, bordered by a narrow lip; in edge view chambers globular in shape, slightly embracing, initial spire of chambers slightly elevated. Size: Maximum diameter of holotype 0.27 mm.
Discussion / Comments:
Pearson et al. (2006):
DISTTNGUISHING FEATURES.- The species is characterized by its small size, 41/2-5 globular, slightly embracing, chambers, umbilical aperture, and cancellate wall texture. DISCUSSION. Blow regarded Globigerina anguliofficinalis as ancestral to Globigerina angulisuturalis Bolli. He separated G. angulisuturalis from G. anguliofficinalis on the basis of a fully 5- chambered test in the former, with a symmetrical umbilical-positioned aperture, and deeply incised "Ushaped" intercameral sutures, which he believed was due to a sharp "in-turning" of the chamber walls. In Globoturborotalita anguliofficinalis the intercameral sutures are less deeply incised. Although Blow believed that the U-shaped intercameral sutures were due to an "in-turning" of the chamber walls, this distinctive morphologic feature is caused by late-stage gametogenetic calcification on adjacent chambers, thus leading to the distinctive U-shaped profile of the sutures. This feature is most accentuated in the hlly 5-chambered Globoturborotalita angulisuturalis, leading to the distinctive morphology of adult forms of this species. Warraich and Ogasawara (2001) included angulisuturalis in their Subbotina species B and the specimen they figured (their fig. 15, 12-14) may be an early morphotype leading to G. anguliofficinalis. A late Eocene radiation of Globotuvborotalita led to the development of 41/2-5 chambered species, which characterize the Oligocene. This radiation is apparently derived from the 4 chambered Globoturborotalita. PHYLOGENETIC RELATIONSHIPS.- Globoturborotalita anguliofficinalis evolved from Globoturborotalita gnaucki by an increase in the number of chambers in the ultimate whorl from 4-41/2 . It appears that this evolutionary transition was accompanied by the buildup of gametogenetic calcite in adult specimens, leading to incisement of the sutures. GEOGRAPHIC DISTRIBUTION.- Distributed in mid- to low latitudes. STABLE ISOTOPE PALEOB1OLOGY.- Douglas and Savin (1978) recorded moderately negative ň18O for this species indicating a mixed layer habitat.
Systematics:

35
 Ordo Foraminiferida
  Superfamilia Globigerinaceae
   Familia Globigerinidae
    Genus Globoturborotalita
     Species Globoturborotalita anguliofficinalis
Synonym list:
Pearson et al. (2006):
1969 Globoturborotalita anguliofficinalis Blow. - Blow : p.379 pl. 11; fig. 1-5 (figs. 1, 2 = holotype [lower Oligocene Zone 02, Flat Rock Silt Member, Cipero Fm., Trinidad])
1979 Globoturborotalita anguliofficinalis Blow. - Blow : pl. 11; fig. 1-5 (reillustration from Blow, 1969)
1980 Globoturborotalita anguliofficinalis Blow. - Charollais et al. : p.64 pl. 6; fig. 12, 13 [lower Oligocene, France]
1985 Globigerina ciperoensis anguliofficinalis Blow. - Bolli & Saunders : p.182 fig. 13, 10-11 (reillustration of holotype)
1991 Globigerina anguliofficinalis Blow. - Spezzaferri & Premoli Silva : p.237 pl. IV; fig. 5a-d [upper Oligocene Zone 06, DSDP Hole 538A, Gulf of Mexico]
1991 "Globigerina" anguliofficinalis Blow. - Spezzaferri & Premoli Silva : p.237 pl. IV; fig. 5a-d [upper Oligocene Zone 06, DSDP Hole 538A, Gulf of Mexico]
? 2001 Subbotina species B . - Warraich & Ogasawara : p.47 fig. 15: 12-14 [Zone E10-12, Kirthar Fm., Sulaiman Range, Pakistan]
2006 Globoturborotalita anguliofficinalis Blow. - Pearson et al. : p.120 pl. 6.2; fig. 1-7
References:

Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422

Blow,W.H. (1979):
The Cainozoic Globigerinida. 3 Vols p. 1413 pp

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

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

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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