Catalog - Globotruncanita stuartoconica Catalog - Globotruncanita stuartoconica

CATALOG OF ORIGINAL DESCRIPTIONS: Globotruncanita stuartoconica Solakius and Salaj 1985

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 -> Globotruncanita -> Globotruncanita stuartoconica
Other pages this level: G. magellana, G. stuartoconica

Globotruncanita stuartoconica

Citation: Globotruncanita stuartoconica Solakius and Salaj 1985
Rank: Species
Type specimens: p. 238, tf. 5( 1-6): : holotype (tf. 5(4-6)). no. LO 5668 T: paratype (tf. 5(1-3)), no. LO 5483 t.
Type sample (& lithostrat): lower part of the El Haria Formation; ranges from the base of the Gansserina gansseri Zone to the top of the Maastrichtian. Thirty-five specimens.
Type age (chronostrat): Upper Maastrichtian
Type locality: Ain Mdeker, west of Enfidaville, northeastern Tunisia. Also found at Kef en Nsoura, in the same region.
Type repository: Lund; Department of Geology, Historical Geology and Palaeontology, University of Lund, Sweden:

Current identification:


Original Description

" Diagnosis. - A Globotruncanita with large. strongly spiroconvex, slightly umbilico-convex or flat. slightly lobate and single-keeled test; spiral side strongly spiroconvex, umbilical side slightly convex or flat: chambers increasing gradually in size in direction of coiling; final whorl composed of larger number of trapezoidal chambers (Globotruncanita stuarli-like); umbilicus wide, round, surrounded by raised and strongly beaded periumbilical ridges; primary aperture interiomarginal umbilical.
" Description. - Test large, strongly spiroconvex, coiled in a high trochospire. Spiral side strongly convex, umbilical side slightly convex or flat. Equatorial periphery almost circular. slightly lobate with a single, well-developed beaded keel; axial periphery subangular; chambers of the spiral side arranged in 3½-4 whorls. The initial chambers are small and globular and are followed by larger chambers which are crescentic in shape and increase gradually in size as added. The final whorl is composed of 7. Globotruncanita stuarti-like chambers strongly elongated in direction of coiling; the first two of these chambers are almost crescentic; the last 5 chambers are trapezoidal forming well-developed angles on the spiral side; on the umbilical side all the chambers of the final whorl are rectangular. The sutures on the spiral side are curved, raised and beaded, on the umbilical side they are slightly curved and raised and weakly beaded. The umbilicus which is wide and round, is surrounded by strongly raised and beaded periumbilical ridges and covered by the tegilla; primary aperture interiomarginal umbilical; wall calcareous, perforate except for the imperforate keel and the tegilla; surface smooth.

Size:
"Dimensions of the holotype (tf. 5(4-6)). - Max. diam. 0.82 mm; mm. diam. 0.70; thickness 0.37 mm.

Extra details from original publication
"Remarks. - Globotruncanita stuartoconica Solakius and Salaj is phylogenetically closely related to Globotruncanita stuarri (de Lapparent) [Rosalina sruarti, 1918] and represents the final member of the evolutionary lineage Globotruncanita bollii (Gandolfi) [Globotruncana (Globotruncana) bollii, 1955] - Globotruncanita insignis (Gandolfi) [Globotruncana (Globotruncana) rosetta (Carsey) subsp. insignis, 1955] -Giobotruncanita stuarti (de Lapparent) - Globotruncanita stuartoconica Solakius and Salaj (see Solakius and Salaj, 1985, op. cit. , p. 231 , tf. 2).

References:

Solakius, N. & Salaj, J. (1985). Foraminiferids from the Maastrichtian of Enfidaville, northeastern Tunisia. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 170(2): 229-241. gs


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Globotruncanita stuartoconica compiled by the pforams@mikrotax project team viewed: 26-3-2023

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