CATALOG OF ORIGINAL DESCRIPTIONS: Globigerinita globiformis 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 -> Globigerinita -> Globigerinita globiformis
Other pages this level: G. africana, G. bikiniensis, G. boweni, G. dissimilis ciperoensis, G. globiformis, G. glutinata flparkerae, G. hardingae, G. howei, G. incrusta, G. iota, G. martini, G. martini martini, G. martini scandretti, G. naparimaensis, G. parkerae, G. riveroae, G. stainforthi praestainforthi, G. unicava primitiva

Globigerinita globiformis

Citation: Globigerinita globiformis Blow & Banner 1962
Rank: Species
Type locality: Lindi area.
Type age (chronostrat): Globigerapsis semi-involuta Zone. Upper Eocene
Type sample (& lithostrat): sample FCRM 1645
Type specimens: Plate XIV S-U; P44551
Type repository: London, UK; NHM

Linked specimens: London, UK; NHM (PM P 44551)

Current identification/main database link: Catapsydrax globiformis (Blow and Banner 1962)


Original Description
The fairly small test consists of 2-3 whorls of weakly inflated, partially embracing, regularly enlarging chambers, coiled in a low trochospire with about 4 chambers in each whorl. The equatorial profile of the test is subcircular and the equatorial periphery is weakly and broadly lobulate. Ina axial profile the test is subglobular to suboval, the dorsal spire being almost as equally convex as the ventral bullate side. In axial view the periphery is broadly and smoothly rounded, the chambers being subglobular to subovoid, lacking a distinct dorso-peripheral shoulder. In dorsal view the chambers are initially semicircular to reniform but they become increasingly depressed and longer than broad during ontogeny. The dorsal sutures are initially obscure, but they later become distinctly, although still weakly and broadly, depressed. The dorsal intercameral sutures are slightly curved or subradial, meeting the weaky lobulate dorsal spiral suture almost t right angles. The ventral intercameral sutures are weakly depressed and subradial. Tree and a half or four primary chambers are visible ventrally. The ventral umbilicus is poorly delimited owing to the uniform convexity of the umbilical margins of the ventral sides of the chambers; even in the deepest part (beneath the bulla) the umbilicus is shallow and nearly closed. The umbilicus and the primary aperture are completely covered by a broad inflated bulla, which protrudes beyond the ventral surfaces of the primary chambers. The bulla typically extends beyon the limits of the umbilicus, extending almost halfway across the ventral chamber surfaces of the primary chambers. The bulla typically extends beyond the limits of the umbilicus, extending almost halfway across the ventral chamber surfaces, often possessing extensions along the intercameral sutures of the primary chambers. The bulla usually encroaches more upon the posterior part of the ventral face of the last chamber than upon the anterior part, but this need not necessarily occur. Three accessory apertures are typically present; two are present on the posterior side of the bulla, over the intercameral sutures between the antepenultimate, penultimate and final chambers, and a single accessory aperture is present anteriorlyover the ventral surface of the first chamber of the last whorl. The accessory apertures are low to moderately high, small, semicircular arches, typically furnished with very narrow, thin lips. The sutures between the primary chambers and the bulla are weakly but distinctly depressed. The primary aperture of the final chamber is a very small arch, typically as high as broaad, aituated at the deepest point of the umbilicus; it may be furnished with an indistinct rim-like lip. The wall of the primary chambers is very thick relative to the size of the test, and is uniformily and fairly coarsely perforate; its surface is punctate, densely and coarsely hispid. The wall of the bulla is distinctly thinner than that of the primary chambers; it is much more finely perforate and is sparsely and very finely hispid.

Size: Maximum diameter of holotype 0.24 mm.

Extra details from original publication
Remarks: Globigerinita globiformis is characterized by its globose shape, which results from tight coiling, depressed and embracing chambers, weakly de- pressed sutures and an extensive (but not highly inflated) bulla, which tends to cover much of the ventral side of the test. It is distinguished from G. africana sp. nov. by its lower trochospire, less lobulate periphery, much tighter coiling and relatively coarser hispidity. The maximum size attained by individuals of G. globiformis is distinctly less than that attained by individuals of G. africana.

Stratigraphical range: In the Lindi area this species ranges from the base of the Globigerapsis semi-involuta Zone to about the middle of the Cribrohantkenina danvillensis Zone, Upper Eocene. It may occur in the uppermost part of the Truncorotaloides rohri Zone, Middle Eocene.

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

Olsson, R. K., Pearson, P. N. & Huber, B. T. (2006c). Taxonomy, biostratigraphy, and phylogeny of Eocene Catapsydrax, Globorotaloides, Guembelitrioides, Paragloborotalia, Parasubbotina, and Pseudoglobigerinella n. gen. 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 5): 67-110. gs V O


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Globigerinita globiformis compiled by the pforams@mikrotax project team viewed: 26-11-2020

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