pforams@mikrotax - Chiloguembelina andreae pforams@mikrotax - Chiloguembelina andreae

Chiloguembelina andreae

Classification: pf_cenozoic -> Guembelitrioidea -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina andreae
Sister taxa: C. adriatica, C. cubensis, C. andreae, C. ototara ⟩⟨ C. parallela, C. trinitatensis, C. wilcoxensis, C. crinita ⟩⟨ C. subtriangularis, C. midwayensis, C. morsei, C. sp.


Citation: Chiloguembelina andreae Premec Fucek, Hernitz Kucenjak and Huber, in Premec Fucek et al. 2018
taxonomic rank: species
Taxonomic discussion:

The 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:

Distinguishing 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.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.


Test biserial, elongate, subtriangular in outline, periphery rounded, slightly lobulate; globular chambers increase moderately in size, usually 11-12, and sometimes up to 14 in adult specimens, initial chambers sometimes slightly twisted, sutures depressed, slightly oblique toward apical axis; aperture a relatively small symmetrical low arch off-centered from the base of the final chamber, bordered on one side by a narrow collar. Apical angle is about 45-50°. [Premec Fucek et al. 2018]

Wall type:
Microperforate, bilamellar, the wall is 3-3.5 μm thick, the inner layer is very thin (0.4-0.5 μm), the outer layer has a submicron-scale granular (blocky) texture, granule size is 0.2-0.35 μm; this has an ototara-type wall (see Chapter 15, this volume); surface is smooth to finely pustulose near the aperture; the wall is evenly perforated by pores that are usually about 0.8 μm in diameter, but can exceed 1 μm as a result of dissolution; pore channels are straight. [Premec Fucek et al. 2018]

Length range 0.13-0.18 mm; width range 0.08-0.11 mm, breadth 0.05-0.07 mm. [Premec Fucek et al. 2018]

Character matrix
test outline:Triangularchamber arrangement:Biserialedge view:Equally biconvexaperture:Interiomarginal
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Smoothshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:2-2 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology

Geographic distribution

Very rare in mid- and low latitudes. Their rare appearance in lower Oligocene sediments (Zone O1 and O2) is a consequence of the small test size, very thin wall and consequently high dissolution susceptibility (Pl. 17.2, Figs. 13, 20). Exceptionally well-preserved material from the Jihar-9, Jazal-2 and Jazal-3 wells in the Palmyride region (Syria) contains more specimens of C. andreae than sediments of poor or moderate preservation. [Premec Fucek et al. 2018]

Isotope paleobiology
No data available. [Premec Fucek et al. 2018]

Phylogenetic relations
Probably descended from Chiloguembelina ototara during the latest Eocene. [Premec Fucek et al. 2018]

Most likely ancestor: Chiloguembelina ototara - at confidence level 3 (out of 5). Data source: Premec Fucek et al. 2018.

Biostratigraphic distribution

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 (30.28-32.1Ma, top in Rupelian stage). Data source: Premec Fucek et al. 2018
First occurrence (base): within E16 zone (33.9-34.68Ma, 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


Chiloguembelina andreae compiled by the pforams@mikrotax project team viewed: 10-12-2023

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