pforams@mikrotax - Globuligerina tojeiraensis pforams@mikrotax - Globuligerina tojeiraensis

Globuligerina tojeiraensis

Classification: pf_mesozoic -> Conoglobigerinidae -> Globuligerina -> Globuligerina tojeiraensis
Sister taxa: G. avariformis, G. balakhmatovae, G. bathoniana, G. dagestanica, G. glinskikhae, G. jurassica, G. oxfordiana, G. tojeiraensis, G. waskowskae, G. sp.


Citation: Globuligerina tojeiraensis Gradstein 2017
taxonomic rank: Species

Type images:

Original description: Relatively low to medium high trochospiral, with an H/D ratio of 0.3–05, rarely larger. Test consists of 2–3 whorls with a tiny initial chamber (where visible). No preferred coiling direction observed. Last whorl with four chambers, which strongly increase in width, flaring out. Chambers are rounded with deeply incised sutures; chambers in the last whorl often radially elongate and higher than broad; last chamber often pointing slightly left or right in the equatorial plane. The test has a sunk-in umbilical region; umbilicus small to large (wide open). G. tojeiraensis has this peculiar knack (depressed umbilicus) with surrounding chambers often sticking up two by two. The chambers 2 and 4 of the last whorl stick more up than chambers 1 and 3.
Aperture a low to rarely high arch; it may be slightly asymmetrical in shape, as shown on Fig. 12.5a; aperture generally umbilical in position, rarely umbilical—extraumbilical. A small bulla occurs rarely; it obscures the aperture of the final chamber. Wall pustulose; pustules may fuse to form broken ridges.

Entries in the Catalog of original descriptions: Globuligerina tojeiraensis

Character matrix
test outline:Lobatechamber arrangement:Trochospiraledge view:Spiroconvexaperture:Umbilical
sp chamber shape:Globularcoiling axis:Low-moderateperiphery:N/Aaperture border:N/A
umb chbr shape:Elongateumbilicus:Wideperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Strongly depressedumb depth:Shallowwall texture:Finely pustuloseshell porosity:Microperforate: <1µm
umbilical or test sutures:Strongly depressedfinal-whorl chambers:4-4 N.B. These characters are used for advanced search. N/A - not applicable

Most likely ancestor: Globuligerina oxfordiana - at confidence level 2 (out of 5). Data source: Gradstein et al. 2017 p.263.

Geological Range:
Last occurrence (top): within Early Tithonian Substage (145.00-149.24Ma, top in Tithonian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Callovian Stage (161.50-165.30Ma, base in Callovian stage). Data source: Gradstein et al. 2017

Plot of range and occurrence data:


Gradstein, F. M. (2017a). New and emended species of Jurassic planktonic foraminifera. Swiss Journal of Palaeontology. 136(2): 161-185. gs

Kendall, S., Gradstein, F., Jones, C., Lord, O. T. & Schmidt, D. N. (2020). Ontogenetic disparity in early planktic foraminifers. Journal of Micropalaeontology. 39: 27-39. gs O


Globuligerina tojeiraensis compiled by the pforams@mikrotax project team viewed: 22-7-2024

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