Chiloguembelina cubensis


Classification: pf_cenozoic -> microperforate -> Chiloguembelinidae -> Chiloguembelina -> Chiloguembelina cubensis
Sister taxa: C. crinita, C. cubensis, C. midwayensis, C. morsei, C. ototara, C. parallela, C. subtriangularis, C. trinitatensis, C. wilcoxensis, C. sp.,

Taxonomy

Citation: Chiloguembelina cubensis (Palmer 1934)
Rank: Species
Basionym: Guembelina cubensis
Synonyms:
Taxonomic discussion: The type descriptions of both Guembelina garretti Howe and Guembelina barnardi Ansary refer to longitudinal striations on the test, hence both are probably referable to this taxon pending further study. Poore and Gosnell (1985) placed C. cubensis in Streptochilus based on observation of an internal plate connecting the foramina of all but the final two chambers. Resig (1993) tentatively reassigned C. cubensis to Chiloguembelina noting that its aperture is typically lower arched and the position of the internal plate is off-centered compared to species of Streptochilus. Observation of costae in this species may require use of an SEM. [Huber et al. 2006]

Catalog entries: Guembelina barnardi;
Guembelina cubensis;
Guembelina garretti;

Type images:

Short diagnosis: Distinguished from Chiloguembelina ototara by presence of fine, discontinuous to continuous costae that are aligned parallel to the elongate axis of the test.

NB The short diagnoses are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus. They have initially been copied from the diagnostic characters/distinguishing features sections of the Eocene and Paleocene Atlases, they will be edited as the site is developed.

Description


Diagnostic characters: Distinguished from Chiloguembelina ototara by presence of fine, discontinuous to continuous costae that are aligned parallel to the elongate axis of the test. [Huber et al. 2006]

Wall type: Microperforate, surface texture finely pustulose on youngest chambers, later becoming faintly but distinctly costate in rows / striae aligned with the long axis of the test. [Huber et al. 2006]

Test morphology: Test biserial, elongate, subtriangular in outline, moderately expanding, periphery rounded rather than compressed; chambers increasing moderately in size, up to 15 in adult specimens; sutures depressed, perpendicular to slightly oblique to growth axis; aperture a low, moderately narrow to broad symmetrical arch centered or slightly off-center from the base of the final chamber, bordered on one side by a narrow collar that thickens away from its attachment point on the chamber face. [Huber et al. 2006]

Size: Length 0.18-0.25 mm, breadth 0.10 - 0.15 mm. [Huber et al. 2006]

Character matrix

test outline:Triangularchamber arrangement:Biserialedge view:Equally biconvexaperture:Terminal
umb chamber shape:Inflatedcoiling axis:N/Aperiphery:N/Aaperture border:Thin lip
sp chbr shape:N/Aumbilicus:N/Aperiph margin shape:Narrowly roundedaccessory apertures:None
umbilical or test sutures:Moderately depressedumb depth:N/Awall texture:Finely costateshell porosity:Microperforate: <1µm
spiral sutures:N/Adiameter mm:0.18-0.25width mm:0.10-0.15breadth mm:
final-whorl chambers:2.0-2.0

Biogeography and Palaeobiology


Geographic distribution: Cosmopolitan. [Huber et al. 2006]

Isotope paleobiology: Poore and Matthews (1984) recorded this species as having amongst the most negative oxygen isotope ratios in an assemblage from DSDP Site 366, suggesting that it inhabited the surface mixed layer. Similarly, Barrera and Huber (1991, 1993) recorded C. cubensis as having more negative oxygen isotope and more positive carbon isotope values than co-occurring species in uppermost Eocene and lower Oligocene at ODP Site 738 (southern Indian Ocean). In contrast Wade and Kroon (2002) recorded oxygen isotope values similar to benthic foraminifera. [Huber et al. 2006]

Phylogenetic relations: Probably evolved from C. ototara during the late Eocene. [Huber et al. 2006]

Biostratigraphic distribution

Geological Range:
Notes: Upper Eocene through upper Oligocene; Zone E10 - Zone O6. The oldest occurrence of this species was recorded from the middle Eocene (Zone E10) of Tanzania (Pl.16.3, Figs. 23-24). Beckmann (1957) recorded the highest occurrence of C. cubenis in the Globorotalia opima opima Zone of Trinidad, and Berggren and others (1995) placed its “last common occurrence” at the top of Subzone P21a (=Zone O4) in mid-Chron 10, at 28.5 Ma. Although Pearson and Chaisson (1997) observed an abrupt extinction of C. cubensis on Ceara Rise, Hornibrook (1990) records continuous occurrences of C. cubensis into the upper Oligocene of New Zealand and lowermost Miocene of Chatham Island. Presence of this species in the equivalent of Zone O6 at ODP Holes 803D and 807A (Leckie and others, 1993) supports Hornibrook’s (1990) observations. [Huber et al. 2006]

The LAD of Chiloguembelina cubensis marks the base of zone O5 / top of O4 (Wade et al. 2011)


Last occurrence (top): at top of O4 zone (100% up, 28.1Ma, in Rupelian stage). Data source: zonal marker (Wade et al. 2011)
First occurrence (base): within E10 zone (41.89-43.23Ma, base in Lutetian stage). Data source: Eocene Atlas

Plot of occurrence data:

Primary source for this page: Huber et al. 2006 - Atlas of Eocene Planktonic Foraminifera, chapter 16, p. 473

References:

Ansary, S.E., (1955). Report on the foraminiferal fauna from the Upper Eocene of Egypt. Publications de l'Institut du Désert d'Egypte, 6: 1-160.

Barrera & Huber 1991 Neogene [sorry, not in our bibliography yet]

Barrera & Huber 1993 [sorry, not in our bibliography yet]

Beckmann, J.P., (1957). Chiloguembelina Loeblich and Tappan and related foraminifera from the Lower Tertiay of Trinidad, B.W.I. In: Loeblich, A.R., Jr. et al. (Editors), Studies in Foraminifera: U.S. National Museum Bulletin 215. U.S. Government Printing Office, Washington, D.C., pp. 83-95.

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

Howe, H.V., (1939). Louisiana Cook Mountain Eocene foraminifera. Bulletin of the Geological Survey of Louisiana, 14: 1-122.

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. et al. (Editors), Atlas of Eocene Planktonic Foraminifera, Cushman Foundation Special Publication 41. Cushman Foundation Special Publication. Allen Press, Lawrence, Kansas, pp. 461-508.

Leckie, R.M.; Farnham, C. & Schmidt, M.G., (1993). Oligocene planktonic foraminifer biostratigraphy of Hole 803D (Ontong Java Plateau) and Hole 628A (Little Bahama Bank), and comparison with the southern high latitudes. In: Berger, W.H., Kroenke, L.W. and al., e. (Editors), Proceedings of the Ocean Drilling Program, Scientific Results. Ocean Drilling Program, College Station, Texas, pp. 113-136.

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

Pearson, P.N. & Chaisson, W.P., (1997). Late Paleocene to middle Miocene planktonic foraminifer biostratigraphy, Ceara Rise. Proceedings of the Ocean Drilling Program, Scientific Results, 154. Ocean Drilling Program, College Station, TX, 33-68 pp.

Poore, R.Z. & Gosnell, L.B., (1985). Apertural features and surface texture of upper Paleogene biserial planktonic foraminifers: Links between Chiloguembelina and Streptochilus. Journal of Foraminiferal Research, 15: 1-5.

Poore, R.Z. & Matthews, R.K., (1984). Oxygen isotope ranking of late Eocene and Oligocene planktonic foraminifers: implications for Oligocene sea-surface temperatures and global ice-volume. Marine Micropaleontology, 9: 111-134.

Resig, J.M., (1993). Cenozoic stratigraphy and paleoceanography of biserial planktonic foraminifers, Ontong Java Plateau. In: Berger, W.H. et al. (Editors), Proceedings of the Ocean Drilling Program, Scientific Results. Ocean Drilling Program, College Station, Texas, pp. 231-244.

Wade, B.S. & Kroon, D., (2002). Middle Eocene regional climate instability: Evidence from the western North Atlantic. Geology, 30: 1011-1014.


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Chiloguembelina cubensis compiled by the pforams@mikrotax project team viewed: 24-9-2017

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