Catalog - Globotruncana hilli Catalog - Globotruncana hilli

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana hilli Pessagno 1967

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 -> Globotruncana -> Globotruncana hilli
Other pages this level: << < G. fornicata manaurensis, G. fornicata motai, G. fornicata plummerae, G. fresnoensis, G. fundiconulosa, G. gagnebini, G. gansseri, G. gansseri gandolfii, G. gansseri subgansseri, G. globigerinoides, G. goudkoffi, G. hanzawai, G. havanensis, G. helvetica, G. helvetica posthelvetica, G. hilli, G. imbricata, G. indica, G. inornata, G. intermedia, G. intermedia difformis, G. japonica, G. japonica robusta, G. kuepperi, G. lakrai, G. lamellosa, G. lapparenti, G. lapparenti coronata, G. lapparenti depressa, G. lapparenti inflata, G. lapparenti longilocula> >>

Globotruncana hilli

Citation: Globotruncana hilli Pessagno 1967
taxonomic rank: Species
Type specimens: Plate 64, figures 9·14: 21·23; Plate 94, figure 1; Plate 97, figure 7; 689268
Type sample (& lithostrat): Upper Taylor Marl
Type locality: From sample TX 291, collectedc from a ditch crossing State Route 73, 2.4 miles east of the intersection of Route 73 with Farm Road 737, Prairie Hill, Limestone County, TX.
Type repository: Washington; USNM

Linked specimens: USNM-689267 USNM-689268

Current identification/main database link: Globotruncana hilli Pessagno 1967


Original Description

Test small trochospiral, relatively planiform both spirally and umbilically; consisting of 2.5 - 3 whorls of chambers which slowly expand in size; 5 chambers in last whorl. Chambers in early whorls and first several chambers of posterior part of final whorl spherical lacking double keel; remaining chambers forming anterior part of final whorl abruptly truncated peripherally by wide doulble keel of G. linneiana type; imperforate peripheral band or weak double keel developed in anterior, but not posterior portion of preceding whorl. Chambers petaloid in shape spirally; separated by curved, depressed to lightly elevated sutures which spirally; separated by curved, depressed to slightly elevated sutures which usually lack beads. Chambers umbilically subrectangular in shape; separated by depressed, slightly curved sutures. Test wall finely spinose throughout. Umbilicus wide and shallow, covered by tegilla with intralaminal and infralaminal accessory apertures. Primary aperture, interiomarginal, umbilical in position. Outer wall radial hyaline perforate except for fine spines and keel. Spines ultragranular hyaline. Keel radial hyaline imperforate; ultragranular hyaline outer portion of spiral and umbilical rims poorly developed. Tegilla and septal walls microgranular hyaline perforate.

Etymology:
n amed for R. T. HiII in honor of his pioneering work on the stratigraphy of the Gulf Coastal Plain area of North America.

Extra details from original publication
Remarks: G. hilli was most likely derived from G. linneiana (d'Orbigny) by the enlargement of the latter forms Archaeoglobigerina stage of development and the restriction of its double keel to the anterior part of its test.
G. hilli differs, from G. linneiana (1) by the small size and finely spinose nature or its test; (2) by its greatly enlarged Archaeoglobigerina stage of development; (3) by the possesion of a double keel only in the anterior portion of the final whorI and the possesion of an imperforate peripheral band or weakly developed keel only in the anterior portion of the preceding whorl: and (4) by the depressed nature of its sutures both spirally and umbilically.
Form analysis data for G. hilli are presented in textfig. 48.

References:

Pessagno, E. A. (1967). Upper Cretaceous planktonic foraminifera from the western Gulf Coastal Plain. Palaeontographica Americana. 5: 245-445. gs O


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Globotruncana hilli compiled by the pforams@mikrotax project team viewed: 21-7-2024

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