Clavatorella bermudezi


Classification: pf_cenozoic -> Globigerinidae -> Clavatorella -> Clavatorella bermudezi
Sister taxa: C. bermudezi, C. sp.,

Taxonomy

Citation: Clavatorella bermudezi (Bolli, 1957)
Rank: species
Basionym: Hastigerinella bermudezi Bolli, 1957

Catalog entries: Hastigerinella bermudezi

Type images:

Distinguishing features: Low trochospiral, lobulate, later chambers club-shaped

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.

Description


Diagnostic characters: Low trochospiral, lobulate later chambers club-shaped

Aperture: Umbilical-extraumbilical interiormarginal elongate arch bordered by a distinct lip [Aze 2011, based on Kennett & Srinivasan 1983]


Wall type: Spinose; Coarsely cancellate [Aze 2011]

Test morphology: Test low trochospiral, equatorial periphery very strongly lobulate; axial periphery broadly rounded; chambers initially spherical to ovate, the later ones becoming radially elongate and club shaped , increasing rapidly in size as added; sutures on spiral side slightly curved to radial, depressed; on umbilical side nearly radial, depressed; surface with uniformly distributed circular to subcircular, subhexagonal funnel-shaped pore pits (PI. 54, Fig. 2); umbilicus fairly wide; aperture interiomarginal, extraumbilical-umbilical, an elongate arch bordered by a distinct lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Stellatechamber arrangement:Trochospiraledge view:Equally biconvexaperture:Umbilical-extraumbilical
sp chamber shape:Elongatecoiling axis:Very lowperiphery:N/Aaperture border:Thin lip
umb chbr shape:Elongateumbilicus:Wideperiph margin shape:Moderately roundedaccessory apertures:None
spiral sutures:Weakly depressedumb depth:Shallowwall texture:Cancellateshell porosity:Macroperforate: >2.5µm
umbilical or test sutures:Weakly depressedfinal-whorl chambers:4.0-5.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical [Kennett & Srinivasan 1983] Low latitudes [Aze et al. 2011, based on Kennett & Srinivasan (1983)]

[SCOR WG138]


Isotope paleobiology: Aze et al. 2011 ecogroup 4 - Open ocean sub-thermocline. Based on very light ∂13C and very heavy ∂18O. Sources cited by Aze et al. 2011 (appendix S3): Pearson & Shackleton (1995); Coxall et al. (2000)

Phylogenetic relations: The surface ultrastructure of Cl. bermudezi is similar to that of Protentella prolixa (distinctly reticulate), but Cl. bermudezi has distinct trochospiral coiling and is larger.
Cl. bermudezi evolved from Globorotaloides hexagona by developing radially elongate, club-shaped chambers in the Early Miocene. [Kennett & Srinivasan 1983]

Most likely ancestor: Globorotaloides hexagonus - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig 24; Pearson 1995, p. 45.

Biostratigraphic distribution

Geological Range:
Last occurrence (top): near top of M7 zone (90% up, 13.8Ma, in Serravallian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).
First occurrence (base): in mid part of M5b subzone (45% up, 15.7Ma, in Burdigalian stage). Data source: Wade et al. (2011), additional event; position within zone determined by linear interpolation from data in table 1 of Wade et al. (2011).

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.218

References:

Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs

Bolli, H. M. (1957b). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations of Trinidad, B.W.I. In, Loeblich, A. R. , Jr. , Tappan, H. , Beckmann, J. P. , Bolli, H. M. , Montanaro Gallitelli & E. Troelsen, J. C. (eds) Studies in Foraminifera. U.S. National Museum Bulletin. 215: 97-123. gs

Coxall, H. K., Pearson, P. N., Shackleton, N. J. & Hall, M. A. (2000). Hantkeninid depth adaptation: An evolving life strategy in a changing ocean. Geology. 28: 87-90. gs

Fox, L. R. & Wade, B. S. (2013). Systematic taxonomy of early–middle Miocene planktonic foraminifera from the equatorial Pacific Ocean: Integrated Ocean Drilling Program, Site U1338. Journal of Foraminiferal Research. 43: 374-405. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Norris, R. D. (1998). Planktonic foraminifer biostratigraphy: Eastern Equatorial Atlantic. Proceedings of the Ocean Drilling Program, Scientific Results. 159: 445-479. gs

Pearson, P. N. & Shackleton, N. J. (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results. 401-410. gs

Pearson, P. N. (1995). Planktonic foraminifer biostratigraphy and the development of pelagic caps on guyots in the Marshall Islands group. Proceedings of the Ocean Drilling Program, Scientific Results. 144: 21-59. gs

Postuma, J. A. (1971). Manual of planktonic foraminifera. Elsevier for Shell Group, The Hague. 1-406. gs

Saito, T., Thompson, P. R. & Breger, D. (1976). Skeletal ultra-microstructure of some elongate-chambered planktonic foraminifera and related species. In, Takayanagi, Y. & Saito, T. (eds) Progress in Micropaleontology, Special Publication. Micropaleontology Press, The American Museum of Natural History, New York 278-304. gs


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Clavatorella bermudezi compiled by the pforams@mikrotax project team viewed: 18-10-2019

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