Catalog - Chiloguembelitria trilobata Catalog - Chiloguembelitria trilobata

CATALOG OF ORIGINAL DESCRIPTIONS: Chiloguembelitria trilobata Arenillas et al. 2017

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 -> C -> Chiloguembelitria -> Chiloguembelitria trilobata
Other pages this level: C. biseriata, C. danica, C. hofkeri, C. trilobata

Chiloguembelitria trilobata

Citation: Chiloguembelitria trilobata Arenillas et al. 2017
taxonomic rank: Species
Type specimens: Fig. 13(e)e(h); . Holotype MPZ 2016/112 (Fig. 13(e)). Paratype MPZ 2016/113 (Fig. 13(f)). MPZ 2016/114 (Fig. 13(g)). Paratype MPZ 2016/115 (Fig. 13(h)).
Type sample (& lithostrat): El Haria Formation; 0.50 m above the Cretaceous/Paleogene boundary of the El Kef section (sample KF19.50).
Type age (chronostrat): uppermost part of Zone Pa, or the lower part of the Eoglobigerina trivialis Subzone (Parasubbotina pseudobulloides Zone), lower Danian.
Type locality: El Kef section,, Tunisia.
Type repository: Zaragosa; Museo de Ciencias Naturales de la Universidad de Zaragoza (Aragon Government, Spain).

Current identification:


Original Description

Test short subconical, low-spired. Triserial arrangement, often slightly twisted, with 8-11 subspherical chambers distributed in 2.5-3.5 spiral whorls, with a high rate of chamber enlargement. Outline subtriangular, lobate, with incised sutures. Aperture interiomarginal, umbilical-extraumbilical to extraumbilical, generally rounded and asymmetrical, with an imperforate lip. Wall surface microperforate, pustulate to rugose, with isolated, decentered pore-mounds, perforate and/or imperforate rugosities, and blunt pustules (papilla-type) and/or sharp pustules. 

Size:
Adult size range 90-120 mm in height.

Etymology:
Latin term trilobata referring to the shape of three lobes in the equatorial outline.

Extra details from original publication
Remarks. It differs from Chg. danica in having a lower triserial test. Specimens of Chg. trilobata sp. nov. have been probably attributed to Guembelitria blowi (or G. trifolia for some authors; MacLeod, 1993; Arenillas et al., 2000a, 2000b) or G. cretacea (Olsson et al., 1999). Nevertheless, Arenillas et al. (2007) and Arz et al. (2010) pointed out the possible existence of pseudocryptic species of Guembelitria spp. in the lower Danian, referring to some of the Chiloguembelitria species defined here. The gross morphology and size of Chg. trilobata sp. nov. resemble those of Trochoguembelitria alabamensis, with which it shares the wall texture but from which it differs in the chamber arrangement (triserial vs. trochospiral).

Occurrence. Lower Danian, from the lower part of Zone Pa to the upper part of Zone P1b of Berggren and Pearson (2005), i.e. from the uppermost part of the Parvularugoglobigerina longiapertura Subzone (Guembelitria cretacea Zone) to the lower part of the Globanomalina compressa Subzone (Parasubbotina pseudobulloides Zone) of Arenillas et al. (2004). It is very frequent in the Eoglobigerina trivialis Subzone (Parasubbotina pseudobulloides Zone), i.e. in P1a (Fig. 1).

References:

Arenillas, I., Arz, J. A. & Gilabert, V. (2017). Revalidation of the genus Chiloguembelitria Hofker: Implications for the evolution of early Danian planktonic foraminifera. Journal of African Earth Sciences. 134: 435-456. gs

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Chiloguembelitria trilobata compiled by the pforams@mikrotax project team viewed: 6-10-2024

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