CATALOG OF ORIGINAL DESCRIPTIONS: Trochoguembelitria olssoni Arenillas et al. 2016

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 -> T -> Trochoguembelitria -> Trochoguembelitria olssoni
Other pages this level: T. liuae, T. olssoni

Trochoguembelitria olssoni

Citation: Trochoguembelitria olssoni Arenillas et al. 2016
Rank: Species
Type locality: El Haria Formation, El Kef section, Tunisia.
Type age (chronostrat): upper part of Zone P_, or upper part of Eoglobigerina simplicissima Subzone of Parvularugoglobigerina eugubina Zone by Arenillas et al. (2004), lower Danian.
Type sample (& lithostrat): 6.5 m above the Cretaceous/Paleogene boundary of the El Kef section (loc. KF18.50)
Type specimens: Holotype MPZ 2014/298 (Plate 4, Fig. 1): maximum diameter or length = 208.7 μm, width = 187.0 μm, height = 134.5 μm; Paratype MPZ 2014/299 (Plate 4, Fig. 2): length = 139.5 μm, width = 115.8 μm, height = 85.5 μm; Paratype MPZ 2014/300 (Plate 4, Fig. 3): l
Type repository: Saragosa; Museo de Ciencias Naturales of the Universidad de Zaragoza, Gobierno de Arag—n, Spain

Current identification:

Original Description
Low trochospiral test, 10 to 12 spherical chambers in 3 spiral whorls, 5 to 5.5 chambers in the last whorl, increasing slowly in size. Outline lobate, subcircular, with incised sutures. Aperture umbilical-extraumbilical (intra-extraumbilical to umbilical-peripheral), rounded, asymmetrical and elongated, with a thin imperforate lip. Wall calcareous hyaline, microperforate, pustulate to rugose consisting of blunt pustules that may coalesce to form small, not aligned rugosities; pustules and rugosities imperforate or with decentred or peripherally associated pores; scattered pore-mounds. Adult size ranges 120–210 μm in maximum diameter.

Size: maximum diameter or length = 208.7 μm, width = 187.0 μm, height = 134.5 μm

Etymology: Species dedicated to Richard K. Olsson for his work on Danian planktonic foraminifera.

Extra details from original publication

Biostratigraphic occurrence: Lower Danian, identified from the middle-upper part of the E. simplicissima Subzone (upper part of the Pv. eugubina Zone) to the lower part of the E. trivialis Subzone (lower part of the P. pseudobulloides Zone), i.e., from the upper part of Pα to the lower part of P1a of Berggren & Pearson (2005).

Remarks: Similar specimens to T. olssoni sp. nov. were already documented by Liu & Olsson (1992), but identified as Pv. eugubina. T. olssoni sp. nov. resembles Pv. eugubina, but the latter is smaller and has a smooth wall texture.


Arenillas, I., Arz, J. & Molina, E. (2004). A new high-resolution planktic foraminiferal zonation and subzonation for the lower Danian. Lethaia. 34: 79-95. gs

Arenillas, I., Arz, J. A. & Náñez, C. (2016). New species of the genus Trochoguembelitria from the lowermost Danian of Tunisia–biostratigraphic and evolutionary implications in planktonic foraminifera. Palaeontographica Abteilung A Palaeozoologie Stratigraphie. 305: 135-161. gs

Liu, C. & Olsson, R. K. (1992). Evolutionary radiation of microperforate planktonic foraminifera following the K/T mass extinction event. Journal of Foraminiferal Research. 22: 328-346. gs


Trochoguembelitria olssoni compiled by the pforams@mikrotax project team viewed: 30-7-2021

Taxon Search:
Advanced Search

Short stable page link: Go to to create a permanent copy of this page - citation notes

Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
Captcha Image
Powered by Commentics