Catalog - Grimsdaleinella spinosa Catalog - Grimsdaleinella spinosa

CATALOG OF ORIGINAL DESCRIPTIONS: Grimsdaleinella spinosa Bolli 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 -> Grimsdaleinella -> Grimsdaleinella spinosa
Other pages this level: G. spinosa

Grimsdaleinella spinosa

Citation: Grimsdaleinella spinosa Bolli 1959
taxonomic rank: Species
Type specimens: Pl I, figs. 1-11; Figured specimens deposited in the Museum of Natural History, Basle (holotype 2519, paratypes 2520-C 2529). Unfigured paratypes deposited in the U.S. National Museum, Washington (USNM 626 332-39).
Type sample (& lithostrat): Sample H.G.K. 3725, a boulder of dark, calcareous shale with calcite veins; originating from the Naparima Hill formation, reworked in the Upper Eocene Plaisance Conglomerate
Type age (chronostrat): Globotruncana inornata and/or Globotruncana renzi zone (Turonian-Coniacian)
Type locality: Stollmeyer Quarry, south side of Hermitage Road, about 7000 feet northeast of the Pointe-à-Pierre Railway Station, Trinidad, B. W. I.; Coordinates N: 268 500 links, E: 374 000 links.
Type repository: Basel, CH; Natural History Museum, also paratypes in USNM

Linked specimens: USNM-626338 USNM-626335 USNM-626336 USNM-626334 USNM-626332 USNM-626333 USNM-626337 USNM-626339

Current identification:


Original Description

Shape of test and chambers. - Biserial throughout, initial 1-2 chambers spherical, later ones becoming elongate with long, tapering spines that extend towards and beyond the initial chambers. The angle between the spines and the longitudinal axis of the test may vary from nil to over 45°. The number of chambers in an adult specimen is about 10.
Wall. - Calcareous, finely perforate, smooth.
Sutures.- Distinct, depressed.
Aperture. - An asymmetrical, comma-shaped slit, interiomarginal, extending into the apertural face, placed more towards one side of the test.

Size:
Length of holotype. - 0.51 mm.

Extra details from original publication
Remarks. - Grimsdaleinella spinosa, n. gen., n. sp., has so far been found only in a single boulder originating from the Naparima Hill formation. The accompanying foraminiferal fauna consists of abundant Heterohelix globulosa (Ehrenberg), Heterohelix sp. and scarce Globotruncana sehncegansi Sigal, Rugoglobigerina sp. and Globigerina cretacea D'Orbigny. The spines of Grimsdaleinella spinosa are delicate and break off easily during preparation of the sample or handling of the specimens. This might be a reason why the species has not yet been found elswhere in beds of equivalent age and representing a similar environment.

Observed stratigraphic range.- Globotruncana inornata and/or Globotruncana renzi zone (Turonian-Coniacian), Naparima Hill formation.

References:

Bolli, H. M. (1959a). Grimsdaleinella, a new genus of the foraminiferal family Heterohelicidae. Eclogae Geologicae Helvetiae. 52(1): 1-4. gs


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Grimsdaleinella spinosa compiled by the pforams@mikrotax project team viewed: 26-5-2024

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