Catalog - Globotruncana intermedia Catalog - Globotruncana intermedia

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncana intermedia Bolli 1951

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 intermedia
Other pages this level: << < 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, G. leupoldi, G. linnei angusticarenata, G. linnei bulloides, G. linnei caliciformis> >>

Globotruncana intermedia

Citation: Globotruncana intermedia Bolli 1951
Taxonomic rank: species
Type specimens: 59681
Type age (chronostrat): Maestrichtian.
Type locality: Lantern marl, Trinidad. Guayaguare area, Brighton area, Pointe-à-Pierre Railway Cut marl.
Type repository: Washington; USNM

Linked specimens: USNM-59682 USNM-59681

Current identification/main database link: Abathomphalus intermedius (Bolli, 1951)


Original Description

The test is usually slightly convex on the dorsal side, flat or often slightly convex ventrally, and distinctly lobate, but this is less pronounced than in G. citae. The five, occasionally four, chambers of the last whorl usually possess a marked peripheral edge or keel, and sometimes a second keel is developed (transition to G. mayaroensis). The sutures on the dorsal side are distinctly curved, whereas ventrally they are radial. The chambers often appear slightly inflated and a few show striations, which are radial on the ventral side and more tangential dorsally. The state of preservation of the specimens so far examined has not allowed detailed study of the aperture or apertures, which probably open into the umbilicus.

Size:
diameter, 0.5 mm.; thickness, 0.2 mm.

Extra details from original publication
This species is intermediate between G. citae and G. mayaroensis. Specimens which cannot definitely be placed as one of these three species have been encountered. It can be assumed, therefore, that G. intermedia evolved from G. citae and led to G. mayaroensis, and has thus a transitional position equivalent to that of G. renzi between G. apenninica and G. lapparenti.

References:

Bolli, H. M. (1951b). Bolli, H. M. (1951). The genus Globotruncana in Trinidad. Journal of Paleontology. 25(2): 187-199. Journal of Paleontology. 25(2): 187-199. gs


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Globotruncana intermedia compiled by the pforams@mikrotax project team viewed: 20-5-2025

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