Catalog entries: Globigerinoides mitra
Type images:Distinguishing features:
Parent taxon (Globigerinoides): Supplementary apertures, with ruber/sacculifer-type spinose wall texture
This taxon: Large test with very high spire, and large, asymmetric primary aperture
Morphology:
Wall type:
Character matrix
test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | Equally biconvex | aperture: | Umbilical |
sp chamber shape: | Globular | coiling axis: | High | periphery: | N/A | aperture border: | N/A |
umb chbr shape: | Elongate | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Sutural |
spiral sutures: | Strongly depressed | umb depth: | Deep | wall texture: | Cancellate | shell porosity: | Macroperforate: >2.5µm |
umbilical or test sutures: | Strongly depressed | final-whorl chambers: | 3-4 | N.B. These characters are used for advanced search. N/A - not applicable |
[SCOR WG138] Gs. mitra is distinguished by its large test size, very high spire, and large, asymmetric primary aperture. Except for its distinct asymmetrically developed adult chambers, Gs. mitra is morphologically close to Gs. subquadratus and Gs. ruber and possibly is intermediate between them.
Geographic distribution
Isotope paleobiology
Phylogenetic relations
Saito et al. (1976) placed Gs. mitra under a new genus, Globicuniculus, stating that it lacks the characteristic elongate spines or the spine bases of the genus Globigerinoides. Todd (1957) described the form as being finely spinose, and thus generic differentiation is not justified on these grounds. However, the form exhibits distinctive smooth surface texture that may be significant taxonomically. [Kennett & Srinivasan 1983]
Most likely ancestor: Globigerinoides subquadratus - at confidence level 3 (out of 5). Data source: Kennett & Srinivasan 1983, fig. 10.
Geological Range:
Last occurrence (top): within N12 zone (11.79-13.41Ma, top in Serravallian stage). Data source: Kennett & Srinivasan 1983
First occurrence (base): within N6 zone (17.54-17.59Ma, base in Burdigalian stage). Data source: Kennett & Srinivasan 1983
Plot of occurrence data:
Primary source for this page: Kennett & Srinivasan 1983, p.76
Aze, T. et al. (2011). A phylogeny of Cenozoic macroperforate planktonic foraminifera from fossil data. Biological Reviews. 86: 900-927. gs Keller, G. (1985). Depth stratification of planktonic foraminifers in the Miocene Ocean. In, Kennett, J. P. (ed.) The Miocene Ocean: Paleoceanography and Biogeography. GSA Memoir . 163: 1-337. 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 O Pearson, P. N. et al. (2001a). Warm tropical sea surface temperatures in the Late Cretaceous and Eocene epochs. Nature. 413: 481-487. 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 Todd, R. (1957). Smaller foraminifera, in Geology of Saipan, Mariana Islands, Pt. 3, Paleontology. U.S. Geological Survey, Professional Paper. 280-H: 265-320. gs OReferences:
Globigerinoides mitra compiled by the pforams@mikrotax project team viewed: 11-9-2024
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