CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia quetra Bolli 1957

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 -> Globorotalia -> Globorotalia quetra
Other pages this level: << < G. pseudomenardii, G. pseudomiocenica, G. pseudopachyderma, G. pseudoscitula, G. pseudoscitula elongata, G. pseudospinulosa, G. pshadae, G. pumilio, G. puncticulata padana, G. puncticulata puncticuloides, G. pusilla laevigata, G. pusilla mediterranica, G. pusilla pusilla, G. quadraria, G. quadrata, G. quetra, G. quinifalcata, G. redbankensis, G. reissi, G. renzi, G. rex, G. saginata, G. saheliana, G. salisburgensis, G. saphoae, G. scitula gigantea, G. scitula praescitula, G. scitula subscitula, G. scitula ventriosa, G. seigliei, G. sibaiyaensis> >>

Globorotalia quetra

Citation: Globorotalia quetra Bolli 1957
Rank: Species
Type locality: Globorotalia rex zone to Globorotalia aragonensis zone. Lizard Springs formation.Trinidad
Type specimens: Holotype (USNM P5070) and figured paratype (USNM P5071) from Ravine Ampelu, Lizard Springs area, about 13/4 mile southeast of the road junction of the Rio Claro -Guayaguayare Road (8 3/4 M.P.) and the old Trinidad Central Oilfields Road leading to the abandoned Lizard Springs oilfield, south-east Trinidad (coordinates N:186505 links; E:556755 links), sample Rz. 293 (TLL 50512).
Type repository: Washington; USNM

Linked specimens: USNM-5071 USNM-5070

Current identification/main database link: Acarinina quetra (Bolli 1957)


Original Description
Shape of test very low trochospiral, spiral side flat or slightly concave, umbilical side strongly convex, angular; equatorial periphery strongly lobate, axial periphery subacute to acute, a spiny peripheral keel is often present in the early chambers of the last whorl; ultimate and penultimate chambers acute or rounded. Wall calcareous, perforate, distinctly spinose. Chambers angular to subangular, inflated, about 12, arranged in 2 1/2 whorls, the four to five chambers of the last whorl increasing rapidly in size. Sutures on spiral side oblique or curved, depressed; on umbilical side radial, depressed. Umbilicus fairly narrow, deep, open. Aperture a low arch; interiomarginal extraumbilical-umbilical. Coiling over 90 percent dextral in the Globorotalia formosa formosa and Globorotalia aragonensis zones.

Size: Largest diameter of holotype 0.64 mm.; largest diameter of figured paratype 0.50 mm.

Extra details from original publication
Remarks: Globorotalia quetra Bolli, new species, is a very characteristic form in the upper Lizard Springs,  where it is especially abundant in the Globorotalia formosa formosa zone. By its shape it might readily be mistaken for the middle Eocene Truncorotaloides rohri
var. mayoensis Bronnimann and Bermudez or for G. topolensis Cushman (which probably is a Truncorotaloides). However, G. quetra lacks the sutural apertures on the spiral side which are characteristic for Truncorotaloides while its stratigraphic range is restricted to the lower Eocene. G. guetra appears to be closely related to G. wilcoxensis Cushman and Ponton, from which it is distinguished by the distinct angular shape of its test. Intermediate forms were found in the Globorotalia rex zone.

References:

Berggren, W. A., Pearson, P. N., Huber, B. T. & Wade, B. S. (2006b). Taxonomy, biostratigraphy, and phylogeny of Eocene Acarinina. 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 9): 257-326. gs V O

Bolli, H. M. (1957d). The genera Globigerina and Globorotalia in the Paleocene-Lower Eocene Lizard Springs Formation of Trinidad. In, Loeblich, A. R. , Jr., Tappan, H., Beckmann, J. P., Bolli, H. M., Montanaro Gallitelli, E. & Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 61-82. gs V O


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Globorotalia quetra compiled by the pforams@mikrotax project team viewed: 15-4-2021

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