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
Most likely ancestor: Globuligerina oxfordiana - at confidence level 2 (out of 5). Data source: Gradstein et al. 2017 p.263.
Last occurrence (top): within Early Tithonian Substage (147.72-152.06Ma, top in Tithonian stage). Data source: Gradstein et al. 2017
First occurrence (base): within Callovian Stage (163.47-166.07Ma, base in Callovian stage). Data source: Gradstein et al. 2017
Plot of range and occurrence data:
|test outline:||Lobate||chamber arrangement:||Trochospiral||edge view:||Spiroconvex||aperture:||Umbilical|
|sp chamber shape:||Globular||coiling axis:||Low-moderate||periphery:||N/A||aperture border:||N/A|
|umb chbr shape:||Elongate||umbilicus:||Wide||periph margin shape:||Broadly rounded||accessory apertures:||None|
|spiral sutures:||Strongly depressed||umb depth:||Shallow||wall texture:||Finely pustulose||shell porosity:||Microperforate: <1µm|
|umbilical or test sutures:||Strongly depressed||final-whorl chambers:||4.0-4.0||N.B. These characters are used for advanced search. N/A - not applicable|
Globuligerina tojeiraensis compiled by the pforams@mikrotax project team viewed: 16-4-2021
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