Olig Atlas pl17-02 14 17 19.JPG
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Olig Atlas pl17-02 09-13.JPG
Olig Atlas pl17-02 15-16.JPG
Olig Atlas pl17-02 23-24.JPG
Olig Atlas pl17-02 14 17 19.JPG
Olig Atlas pl17-02 18 20.JPG
Olig Atlas pl17-02 09-13.JPG
Olig Atlas pl17-02 15-16.JPG
Olig Atlas pl17-02 23-24.JPGThe specimens of Chiloguembelina andreae presented in this work were found in the Adriatic Sea and in Syria. They are characterized by having a smooth test surface, globular chambers and a small aperture, bordered on one side by a narrow collar. The first description of biserial planktonic foraminifera with a smooth surface was by Andreae (1884) for his species Textilaria gracillima: “Very small test show 7-8 chambers, distinct and deep sutures. The four youngest chambers are inflated, spherical, and each is slightly different in size. The test is three times longer than wide. The shell is smooth, glossy and very finely perforate. The species is very rare.” Unfortunately the holotype was lost in a fire in Strasbourg and the type section, described as a wood path between Sentheim and Aue (Lauw) in Upper Alsace, cannot be located. Our search for material from the C. gracillima type locality, including searches of Cushman residues from Oligocene localities from the Alsace region that were studied by Andreae, has met with no success. Hence we must regard gracillima as nomen dubium non conservandum. However, the name Chiloguembelina gracillima in Middle and Eastern Europe has been often used for biserial forms with a pustulose test surface (Cicha and others, 1998; Hamrsmid and Rögl, 2000). This form may belong to C. ototara (F. Rögl, personal communication). Bombita and Rusu (1981) and Andreyeva-Grigorovich and others (2008) also recorded the presence of C. gracillima, but without illustrations. Due to the uncertainty of the test surface of C. gracillima and to avoid taxonomic confusion, we have decided to name a new species for the smooth-walled forms. One of the specimens illustrated by Huber and others (2006) as ototara is assigned to andreae in this work because it lacks pustules on the earlier chambers. [Premec Fucek et al. 2018]
Catalog entries: Chiloguembelina andreae
Type images:
holotype: C. andreae
paratype: C. andreae
paratype: C. andreaeDistinguishing features:
Parent taxon (Chiloguembelina): Test subtriangular in outline, biserial throughout or rarely with multiserial final chambers; aperture a simple arched opening at base of the final chamber, with a narrow rim on one margin and a broad collar or flange directed toward one of the flat sides of the test, lacking an infolded margin or internal plate. Rarely with multiple apertures.
This taxon: Like C. ototara but with smooth microperforate wall texture.
Morphology:
Wall type:
Olig Atlas pl17-02 21-22.JPGCharacter matrix
| test outline: | Triangular | chamber arrangement: | Biserial | edge view: | Equally biconvex | aperture: | Interiomarginal |
| sp chamber shape: | Globular | coiling axis: | N/A | periphery: | N/A | aperture border: | Thin lip |
| umb chbr shape: | Globular | umbilicus: | N/A | periph margin shape: | Broadly rounded | accessory apertures: | None |
| spiral sutures: | Moderately depressed | umb depth: | N/A | wall texture: | Smooth | shell porosity: | Microperforate: <1µm |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 2-2 | N.B. These characters are used for advanced search. N/A - not applicable | |||
Geographic distribution
Isotope paleobiology
Phylogenetic relations
Most likely ancestor: Chiloguembelina ototara - at confidence level 3 (out of 5). Data source: Premec Fucek et al. 2018.
Geological Range:
Notes: Upper part of the upper Eocene to lower Oligocene (Zone E16-O2). [Premec Fucek et al. 2018]
Last occurrence (top): within O2 zone (30.28-32.10Ma, top in Rupelian stage). Data source: Premec Fucek et al. 2018
First occurrence (base): within E16 zone (33.90-34.68Ma, base in Priabonian stage). Data source: Premec Fucek et al. 2018
Plot of occurrence data:
Primary source for this page: Premec Fucek et al. 2018 - Olig Atlas chap.17 p.466
Andreae, A. (1884). Ein beitrag zur kenntniss des Elsasser Tertiars. In, Abhandlungen der Geol. Special - Karte Elsass - Lothringen. R. Schulz, Strassburg II(III): 1-239. gs Bombita, G. & Rusu, A. (1981). New data on the Eocene/Oligocene boundary in the Romanian Carpathians. Palaeogeography Palaeoclimatology Palaeoecology. 36: 213-222. gs Cicha, I., Rögl, F., Rupp, C. & Ctyroká, J. (1998). Oligocene-Miocene foraminifera of the central Paratethys. Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft. 549: 1-325. gs Finlay, H. J. (1940). New Zealand foraminifera: Key species in stratigraphy - no. 4. Transactions of the Royal Society of New Zealand. 69(4): 448-472. gs Hamrsmid, B. & Rögl, F. (2000). Biostratigraphy of the Baba Heydar section, Iran. Senckenbergiana Lethaea. 80: 39-44. gs Huber, B. T., Olsson, R. K. & Pearson, P. N. (2006). Taxonomy, biostratigraphy, and phylogeny of Eocene microperforate planktonic foraminifera (Jenkinsina, Cassigerinelloita, Chiloguembelina, Streptochilus, Zeauvigerina, Tenuitella, and Cassigerinella) and Problematica (Dipsidripella). In, Pearson, P. N., Olsson, R. K., Hemleben, C., Huber, B. T. & Berggren, W. A. (eds) Atlas of Eocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 41(Chap 16): 461-508. gs O Premec Fucek, V., Hernitz Kucenjak, M. & Huber, B. T. (2018). Taxonomy, biostratigraphy, and phylogeny of Oligocene Chiloguembelina and Jenkinsina. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 17): 459-480. gs References:
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Chiloguembelina andreae compiled by the pforams@mikrotax project team viewed: 10-9-2024
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