Catalog - Globorotalia formosa gracilis Catalog - Globorotalia formosa gracilis

CATALOG OF ORIGINAL DESCRIPTIONS: Globorotalia formosa gracilis 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 formosa gracilis
Other pages this level: << < G. dehiscens, G. delrioensis, G. denseconnexa, G. dolabrata, G. dominicana, G. edgari, G. ehrenbergi, G. emilei, G. extans, G. faragi, G. flabelliformis, G. fohsi, G. fohsi andina, G. fohsi robusta, G. formosa formosa, G. formosa gracilis, G. gavalae, G. gemma, G. globigeriniformis, G. greenhornensis, G. hadii, G. haunsbergensis, G. haynesi, G. hemisphaerica, G. hessi, G. hexacamerata, G. hirsuta aemiliana, G. hirsuta eastropacia, G. hispidicidaris, G. humerosa, G. hungarica> >>

Globorotalia formosa gracilis

Citation: Globorotalia formosa gracilis Bolli 1957
Taxonomic rank: sub-species
Type specimens: P5055
Type sample (& lithostrat): Lizard Springs Fm.
Type age (chronostrat): Stratigraphic range: Globorotalia rex zone to Globorotalia formosa formosa zone,
Type locality: G. rex Zone, Trinidad Leaseholds, Ltd., well Guayaguayare 159, core 3,707-13', upper Lizard Springs Fm., Trinidad
Type repository: Washington; USNM

Linked specimens: USNM-5055

Current identification/main database link: Morozovella gracilis (Bolli 1957)


Original Description

Shape of test very low trochospiral, spiral side almost flat or slightly convex, umbilical side distinctly convex; equatorial periphery lobate; axial periphery angular with a faint keel ornamented with spines. Wall calcareous, perforate, surface distinctly spinose. Chambers angular, inflated; about twelve, arranged in two and one-half to three whorls, the five or six chambers of the last whorl increasing rapidly in size. Sutures on the dorsal side slightly curved to oblique, slightly depressed; on umbilical side radial, distinctly depressed. Umbilicus fairly narrow, deep, open. Aperture a low arch; interiomarginal, extraumbilical-umbilical. Coiling between 90 and 100 percent dextral.

Size:
Largest diameter of holotype 0.50 mm.

Extra details from original publication


Remarks: Globorotalia formosa gracilis Bolli, new species, new subspecies, differs from the related G. aequa Cushman and Renz in possessing a more distinct but thinner peripheral keel and more chambers in the last whorl. G. formosa gracilis is regarded as the ancestor of G. formosa formosa Bolli, new species, new subspecies.

References:

Berggren, W. A. & Pearson, P. N. (2006a). Taxonomy, biostratigraphy, and phylogeny of Eocene Morozovella. 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 11): 343-376. gs 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


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Globorotalia formosa gracilis compiled by the pforams@mikrotax project team viewed: 6-10-2026

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