CATALOG OF ORIGINAL DESCRIPTIONS: Globigerina praebulloides Blow 1959

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
Other pages this level: << < G. parisiensis, 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> >>

Globigerina praebulloides

Citation: Globigerina praebulloides Blow 1959
Rank: species
Type locality: near Pozon, eastern Falcon; Venzuela.
Type sample (& lithostrat): From sample, No. RM 19285, auger line near Pozon, eastern Falcon;
Type specimens: Holotype No. 625701. Figured paratype (Pl. 9, fig. 48) No. 625702.
Type repository: Washington; USNM

Linked specimens: USNM-625702 USNM-625701 USNM-625702

Current identification/main database link: Globigerinella obesa (Bolli, 1957)


Original Description
Test weakly trochospiral with 8-9 chambers arranged in about 1½ whorls, with usually 4, occasionally 5, chambers in the last whorl. The fifth chamber, when present, only rudimentary or small; chambers ovate, not much inflated but appressed and often slightly embracing, increasing rapidly in size as added so that the equatorial profile of the test appears distinctly elongate in the direction of the last chamber; equatorial periphery lobate; axial periphery rounded; sutures of the spiral and umbilical sides depressed but rather shallow, radial to slightly curved; umbilicus small and not deep; aperture a low to moderate arch, interiomarginal, umbilical; wall calcareous, perforate.

Size: maximum diameter of holotype, 0.30 mm.

Extra details from original publication
Globigerina aff. bulloides d'Orbigny, Stainforth, 1948, (pars), Jour. Pal., vol. 22, No. 2, p. 118, Pl. 25, figs.' 14, 15 (non figs. 16-18).

Remarks: This species differs from Globigerina bulloides d'Orbigny in having an elongate, not subcircular, equatorial profile, and chambers which are normally ovate, appressed and often slightly embracing. The chambers increase more rapidly in size in this species and the coiling is less trochospiral and not so precise as in Globigerina bulloides. This species also differs from Globigerina bulloides in having a comparatively smaller, less strongly arched aperture and the test is consistently smaller in size. Stainforth (1948b, p. 118) noted the same characters as recorded above for forms he referred to as Globigerina aff. bulloides "form A", from the Oligocene of Ecuador; however, Stainforth described two different forms as Globigerina aff. bulloides, and his "form B" (Stainforth, 1948b, p. 121 explanation of plate 25, figs. 16-18) seems referable to the genus Globorotalia.

Globigerina praebulloides is considered as being ancestral to both Globigerina bulloides and Globigerina parabulloides.

Occurrence: Ranges from the Catapsydrax stainforthi Zone to the middle part of the Globorotalia menardii menardii/Globigerina nepenthes Zone, Tocuyo and Pozon formations.

References:

Blow, W. H. (1959). Age, correlation, and biostratigraphy of the upper Tocuyo (San Lorenzo) and Pozon Formations, eastern Falcon, Venezuela. Bulletins of American Paleontology. 39(178): 67-251. gs

Spezzaferri, S., Coxall, H. K., Olsson, R. K. & Hemleben, C. (2018a). Taxonomy, biostratigraphy, and phylogeny of Oligocene Globigerina, Globigerinella, and Quiltyella n. gen. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 6): 179-214. gs V O

Spezzaferri, S., Olsson, R. K., Hemleben, C., Wade, B. S. & Coxall, H. K. (2018d). Taxonomy, biostratigraphy, and phylogeny of Oligocene and Lower Miocene Globoturborotalita. In, Wade, B. S. , Olsson, R. K. , Pearson, P. N. , Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication. 46(Chap 8): 231-268. gs V O


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

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