CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina praebulloides leroyi Blow & Banner 1962

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> G -> Globigerina -> Globigerina praebulloides leroyi
Other pages this level: << < G. partidiana, G. parva, G. patagonica, G. pauciloculata, G. pera, G. picassiana, G. pileata, G. planispira, G. planoexilis, G. polusi, G. portsdownensis, G. postcretacea, G. posttriloculinoides, G. posttriloculinoides clinata, G. praebulloides, G. praebulloides leroyi, G. praebulloides occlusa, G. praebulloides pseudociperoensis, G. praebulloides pseudoleroyi, G. praebulloides tinguarensis, G. praedigitata, G. praeglobotruncanaeformis, G. prasaepis, G. prolata, G. prolonga, G. protoreticulata, G. pseudoampliapertura, G. pseudobulloides, G. pseudocorpulenta, G. pseudocretacea, G. pseudodruryi> >>

Globigerina praebulloides leroyi

Citation: Globigerina praebulloides leroyi Blow & Banner 1962
Rank: sub-species
Type locality: Lindi area, Tanzania
Type sample (& lithostrat): sample FCRM 1965
Type specimens: Plate IX R-T; Fig. 9(v); P44511
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (PM P 44511) London, UK; NHM (PM PF 44511)

Current identification/main database link: Globigerina officinalis Subbotina 1953


Original Description
The fairly small test consists of about two to three whorls fo subglobular to very slightly ovoid, inflated, partially embracing chambers arranged four to a wghorl in a low trochospire. The equatorial profile 9in ventral view) is subquadrate to subtrapezoid and the equatorial periphery is lobulate. The axial profile is suboval; the axial periphery is broadly rounded, the ventral sides of the chambers being only slightly more convex than the dorsal sides. The chambers are regularly and fairly rapidly enIarging; in dorsal view the early chambers are broadly reniform, becoming hemisphencal during ontogeny. The sutures are distinctly and broadly depressed The dorsal intercameral sutures are intially curved but become increasingly radial during ontogeny. The spiral suture is moderately lobulate, and the spire projects slightly above the plane of the dorsal surface. The umbilicus is small, but deep and open; the apertural faces of the chambers are but slightly flattened and the umbilicus is not sharply delimited and does not possess a clear quadrangular outline. The intraumbilical aperture of the last chamber is a low symmetrical arch highest at its mid-point; it is bordered by a distinct rim-like lip. The relict aperture of the penultimate chamber can be seen within the umbilicus. The wall is fairly coarsely perforate relative to the size of the test and it is hispid, often most strongly so on the dorsal side and on the margins of the umbilicus.

Size: Maximum diameter of holotype: 0·265 mm

Etymology: This subspecies is named for Professor L. W. LeRoy (Colorado School of Mines) in recognition of his work on foraminiferal biostratigraphy.

Extra details from original publication

Remarks
: This subspecies is distinguished from Globigerina praebulloides praebulloides principally by its smaller umbilicus, lower and more symmetrical aperture, slower rate of chamber enlargement and greater degree of embrace between its chambers. It is distinguished from Globigerina ouachitaensis ouachitaensis by its much smaller umbilicus which lacks a distinct quadrate shape, by its smaller aperture and by its relatively unflattened and distinctly hispid apertural face. It is distinguished from G. officinalis by its deeper umbilicus, symmetrical aperture, its more coarsely perforate and hispid test.

Stratigraphical range; This subspecies is widely distributed in both the Caribbean and East African regions. In the Lindi area it ranges from the Globigerina turritilina turritilina Zone, Upper Eocene, to the top of the Oligocene. Elsewhere in East Africa it occurs in beds of Aquitanian age. In Trinidad it ranges from the G. ampliapertura Zone to, at least, the upper Aquitanian Globigerinatella insueta Zone. It has been observed in the Aquitanian of Moulin de l'Eglise and Escornebeou, south-west France, and also in the Oligocene of Elmsheim and Offenbach, Germany. Batjes (1958) illustrated a form as G!obigerina globularis Roemer from the Oligocene of Belgium; this form seems to be the same as G. praebulloides leroyi. We consider G. globularis Roemer to be nomen dubium. Subbotina's specimen, referred by her to G. officinalis, came from the uppermost Eocene (Bolivina Zone) of the Caucasus and the Bolivina Zone may prove to be equivalent to the G. turritilina turritilina Zone of East Africa.

References:

Blow, W. H. & Banner, F. T. (1962). The mid-Tertiary (Upper Eocene to Aquitanian) Globigerinaceae. In, Eames, F. E. , Banner, F. T. , Blow, W. H. & Clarke, W. J. (eds) Fundamentals of mid-Tertiary Stratigraphical Correlation. Cambridge University Press, Cambridge 61-151. gs

Blow, W. H. (1969). Late middle Eocene to Recent planktonic foraminiferal biostratigraphy. In, Bronnimann, P. & Renz, H. H. (eds) Proceedings of the First International Conference on Planktonic Microfossils, Geneva, 1967. E J Brill, Leiden 380-381. gs

Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (2006a). Taxonomy, biostratigraphy, and phylogeny of Eocene Globigerina, Globoturborotalita, Subbotina, and Turborotalita. In, Pearson, P. N. , Olsson, R. K. , Hemleben, C. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 41(Chap 6): 111-168. gs V O


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Globigerina praebulloides leroyi compiled by the pforams@mikrotax project team viewed: 27-11-2020

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