Clavatorella bermudezi

NB TAXA WHICH ORIGINATE IN THE OLIGOCENE ARE NOT INCLUDED YET
Classification: pf_neogene -> Globigerinidae -> Clavatorella -> Clavatorella bermudezi
Sister taxa: C. bermudezi, C. nicobarensis,

Taxonomy

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

Catalog entries: Hastigerinella bermudezi;

Type images:

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]

Biogeography and Palaeobiology


Geographic distribution: Tropical [Kennett & Srinivasan 1983]

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]

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 & Srinivisan 1983, p.218

References:

Aze, T.; Ezard, T.H.G.; Purvis, A.; Coxall, H.K.; Stewart, D.R.M.; Wade, B.S. & Pearson, P.N.P., (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews, 86: 900-927.

Bolli, H.M., (1957). Planktonic foraminifera from the Oligocene-Miocene Cipero and Lengua formations 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, DC, pp. 97-123.

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.

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

Pearson, P.N. & Shackleton, N.J. (Editors), (1995). Neogene multispecies planktonic foraminifer stable isotope record, Site 871, Limalok Guyot. Proceedings of the Ocean Drilling Program, Scientific Results, 144. Ocean Drilling Program, College Station, TX, 401-410 pp.


Clavatorella bermudezi compiled by the pforams@mikrotax project team viewed: 26-6-2017

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