Catalog - Globoquadrina pozonensis

Catalog - Globoquadrina pozonensis Catalog - Globoquadrina pozonensis

CATALOG OF ORIGINAL DESCRIPTIONS: Globoquadrina pozonensis 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 -> Globoquadrina -> Globoquadrina pozonensis

Other pages this level: G. altispira conica, G. altispira globosa, G. asanoi, G. dehiscens praedehiscens, G. globularis, G. himiensis, G. kagaensis, G. langhiana, G. larmeui, G. obesa, G. pachyderma pacifica, G. palmerae, G. patriciae, G. pozonensis, G. primitiva, G. pseudofoliata, G. quadraria advena, G. sellii, G. subdehiscens, G. tripartita laxispira, G. tripartita tricamerata

Blow 1959 pl10 f054.JPG
Blow 1959 pl10 f055-56.JPG

Globoquadrina pozonensis

Citation: Globoquadrina pozonensis Blow 1959

taxonomic rank: species

Type specimens: Holotype: Pl. 10, figures 54a-c, No. 625703. (Figured paratypes from same sample also deposited in U.S.N.M.)

Type sample (& lithostrat): sample. No. MM. 20065, auger line near Pozon, eastern Falcon;

Type locality: near Pozon, eastern Falcon; Venzuela

Type repository: Washington; USNM

Linked specimens: USNM-625704 USNM-625704 USNM-625703 USNM-625704

Current identification/main database link: Dentoglobigerina globosa (Bolli, 1957)

Original Description

Test distinctly trochospiral with 11-12 chambers arranged in about 2½ whorls and with 4-5 chambers in the last whorl; chambers subspherical to ovate but sometimes rather appressed and also slightly compressed laterally; equatorial periphery lobate; equatorial profile subcircular; axial periphery rounded; sutures of the spiral and umbilical sides radial and depressed; umbilicus rather small but deep; aperture a rather small arched opening with a distinct umbilicial tooth; in the adult generally interiomarginal, umbilical, but in some specimens (Pl. 10, fig. 55) interiomarginal, umbilical-slightly extraumbilical; apertures of the early chambers and in juvenile specimens distinctly interiomarginal, umbilical-extraumbilical; wall calcareous, coarsely perforate and often rather rough to slightly spinose;

Size:

maximum diameter of holotype, 0.28 mm.

Extra details from original publication

Remarks: This species shows a distinctly interiomarginal, umbilical-extraumbilical aperture in the early chambers which becomes generally interiomarginal, umbilical in the adult. The umbilical teeth, although small, are distinct. The sutures are usually distinct, notwithstanding the rather appressed and laterally compressed chambers seen in some specimens. Globoquadrina pozonensis is distinguished from Globoquadrina altispira globosa Bolli by the rather more appressed chambers, rehitively smaller umbilicus, relatively smaller aperture and consistently smaller test and by the coarsely perforate and rather rough wall. Occurrence: Ranges from the Globorotalia mayeri/Globigigerina nepenthes Subzone to the Globigerina bulloides Zone, Pozon formation.

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

Globoquadrina pozonensis compiled by the pforams@mikrotax project team viewed: 16-10-2024

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