pforams@mikrotax - Chiloguembelina ototara pforams@mikrotax - Chiloguembelina ototara

Chiloguembelina ototara

Classification: pf_cenozoic -> Guembelitrioidea -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina ototara
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 ototara (Finlay 1940)
taxonomic rank: Species
Basionym: Guembelina ototara
Taxonomic discussion:

Hornibrook (1990) was the first to draw attention to the significant difference in wall texture between topotypes of C. cubensis, which are striate, and topotypes of C. ototara, which have pustules that are randomly distributed on the test surface rather than striae. These differences are apparent in SEM images but they are difficult to discern under the light microscope. Guembelina cubensis Palmer var. heterostoma Bermúdez and Guembelina venezuelana Nuttall var. rugosa Parr may be prior synonyms but their wall textures are currently undetermined. [Huber et al. 2006]

Catalog entries: Guembelina ototara, Guembelina cubensis heterostoma, Guembelina venezuelana rugosa, Guembelina multicellaris

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: Test short to somewhat elongate, moderately to rapidly expanding, subtriangular, periphery rounded rather than compressed; usually 11-12, up to 15 chambers; sutures depressed, perpendicular to slightly oblique to growth axis; Aperture moderately narrow to broad symmetrical arch centered or slightly off-center, bordered on one side by a narrow lip.

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, moderately to rapidly expanding, subtriangular in outline with an apical angle of 50-55°; periphery rounded rather than compressed; chambers increasing moderately to rapidly in size, usually 11-12, and sometimes up to 15 in adult specimens; sutures depressed, perpendicular to slightly oblique to growth axis; aperture a moderately narrow to broad symmetrical arch centered or slightly off-center of the base of the final chamber, extending half-way up the final chamber face, bordered on one side by a narrow lip that thickens away from its attachment point on the chamber face; some specimens with an irregularly shaped terminal chamber. [Premec Fucek et al. 2018]

Wall type:
Microperforate, bilamellar, (ototara-type wall; see Chapter 15, this volume); uniformly finely pustulose, lacking pore mounds or costae. [Premec Fucek et al. 2018]

Paratype USNM 689102: length, 0.17 mm, width 0.10 mm, breadth 0.07 mm; hypotypes up to 0.23 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:Finely pustuloseshell 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

Cosmopolitan. [Premec Fucek et al. 2018]

Isotope paleobiology
On the basis of stable isotope data of C. ototara from Zone E14 in the northwest Atlantic Ocean (ODP 1052B), Sexton and others (2006) report that this species occupied a thermocline habitat. Stable isotope data obtained for the upper Eocene C. ototara (Barrera and Huber, 1991; identified as Chiloguembelina spp.) suggest that it lived near the surface mixed-layer at high southern latitudes. [Premec Fucek et al. 2018]

Phylogenetic relations
Probably descended from Chiloguembelina crinita during the early middle Eocene. [Premec Fucek et al. 2018]

Most likely ancestor: Chiloguembelina crinita - at confidence level 3 (out of 5). Data source: Huber et al. 2006, f16.2.
Likely descendants: Chiloguembelina andreae; Chiloguembelina cubensis; plot with descendants

Biostratigraphic distribution

Geological Range:
Notes: Middle Eocene Zone E9 (Huber and others, 2006) through lowermost part of Oligocene Zone O2 (this study). The lowest occurrence of this species is difficult to determine because of its morphologic similarity to its presumed ancestor, C. crinita. A lowermost Oligocene (Zone O1) extinction of this species was recorded in New Zealand (Hornibrook, 1990) and ODP Sites 806 and 807 on Ontong Java Plateau (Resig, 1993). Investigations in this work in Syria (Palmyride region) and north Adriatic Sea suggest its highest occurrence (HO) in the lowermost part of the Zone 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 E9 zone (43.23-43.85Ma, base in Lutetian stage). Data source: Huber et al. 2006, f16.2

Plot of occurrence data:

Primary source for this page: Premec Fucek et al. 2018 - Olig Atlas chap.17 p.471; Huber et al. 2006 - Eocene Atlas, chap. 16, p. 474


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

Barrera, E. & Huber, B. T. (1991). Paleogene and early Neogene oceanography of the southern Indian Ocean: Leg 119 foraminifer stable isotope results. Proceedings of the Ocean Drilling Program, Scientific Results. 119: 693-717. gs

Bermudez, P. J. (1937b). Nuevas especies de Foraminiferos del Eoceno de Cuba. Memorias de la Sociedad Cubana de Historia Natural “Felipe Poey”. 11: 137-150. 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

Firth, J. V., Eldrett, J. S., Harding, I. C., Coxall, H. K. & Wade, B. S. (2013). Integrated biomagnetochronology for the Palaeogene of ODP Hole 647A: implications for correlating palaeoceanographic events from high to low latitudes, in Jovane, L., Herrero-Bervera, E., Hinnov, L.A., and Housen, B.A. (eds.), Magnetic Methods and the Timing of Geological Processes. Geological Society of London, Special Publications. 373: 29-78. gs

Hamrsmid, B. & Rögl, F. (2000). Biostratigraphy of the Baba Heydar section, Iran. Senckenbergiana Lethaea. 80: 39-44. gs

Hornibrook, N. d. B. (1990). Chiloguembelina cubensis (Palmer) and C. ototara (Finlay), in New Zealand. Journal of Foraminiferal Research. 20(4): 368-371. gs

Huber, B. T. (1991c). Paleogene and Early Neogene Planktonic Foraminifer Biostratigraphy of Sites 738 and 744, Kerguelen Plateau (Southern Indian Ocean). Proceedings of the Ocean Drilling Program, Scientific Results. 119: 427-449. 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

Hussey, K. M. (1949). Louisiana Cane River Eocene foraminifera. Journal of Paleontology. 23: 109-144. gs

Jenkins, D. G. & Srinivasan, M. S. (1986). Cenozoic planktonic foraminifera from the equator to the sub-antarctic of the Southwest Pacific. Initial Reports of the Deep Sea Drilling Project. 90: 795-834. gs

Jenkins, D. G. (1971). New Zealand Cenozoic Planktonic Foraminifera. New Zealand Geological Survey, Paleontological Bulletin. 42: 1-278. gs

Malumian, N., Jannou, G. & Náñez, C. (2009). Serial planktonic foraminifera from the Paleogene of the Tierra del Fuego Island, South America. Journal of Foraminiferal Research. 39: 316-321. gs

Miller, K. G. et al. (2008). Eocene-Oligocene global climate and sea-level changes: St. Stephens Quarry, Alabama. Geological Society of America, Bulletin. 120: 34-53. gs

Palmer, D. K. (1934). The Foraminiferal Genus Guembelina in the Tertiary of Cuba. Memorias de la Sociedad Cubana de Historia Natural “Felipe Poey”. 8(2): 73-76. gs

Parr, W. J. (1938). Upper Eocene Foraminifera from Deep Borings in King's Park, Perth, Western Australia. Journal of the Royal Society of Western Australia. 24: 69-101. gs

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

Resig, J. M. (1993). Cenozoic stratigraphy and paleoceanography of biserial planktonic foraminifers, Ontong Java Plateau. Proceedings of the Ocean Drilling Program, Scientific Results. 130: 231-244. gs

Sexton, P. E., Wilson, P. A. & Pearson, P. N. (2006). Palaeoecology of late middle Eocene planktic foraminifera and evolutionary implications. Marine Micropaleontology. 60: 1-16. gs


Chiloguembelina ototara compiled by the pforams@mikrotax project team viewed: 24-6-2024

Taxon Search:
Advanced Search

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

Add Comment

* Required information
Captcha Image
Powered by Commentics


No comments yet. Be the first!