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Current identification:
Globigerinoides inusitatus was described from the lower Miocene, Landon Series, lower Waitakian Stage by Jenkins (1965). We have placed this morphospecies into Problematica for several reasons. Firstly, the original drawing shows a thick rim bordering the supplementary aperture that is supposed to be diagnostic; however, our new SEMs of the holotype (Pl. 20.4, Figs. 9-11) do not show a thick rim. Secondly, we have doubts as to whether the holotype and paratype are conspecific. Finally, we do not consider the SEM images in Jenkins and Srinivasan (1986) and Spezzaferri (1994) to be consistent with the holotype. Jenkins (1965) proposes a close relationship between this species and Globigerina bulloides. However, the difference in the wall texture of these species, cancellate and sacculifer-type wall in G. inusitatus, suggests a close relationship with the genus Globoturborotalita. [Berggren & Wade 2018]
Original Description
Size:
Etymology:
Extra details from original publication
A distinguishing feature of the rare G. inusitatus is the distinctive rim around the supplementary aperture on the spiral side. In some specimens (Nos. 75-77) the supplementary aperture is much lower-arched than the holotype (Nos. 72-74).
G. inusitatus occurs well below the first appearance of the Globigerinoides trilobus (Reuss) lineage and does not appear to be related in any way to it or to Globigerinoides altiaperturus Bolli and Globigerinoides primordius Blow and Banner.
G. inusitatus differs from Globigerinoides parva Hornibrook in having a larger and a lower-spired test; the latter species appears to be related to Globigerina brady; Wiesner (Hornibrook, 1961).
Editors' Notes
Berggren, W. A. & Wade, B. S. (2018). Problematica. In, Wade, B. S., Olsson, R. K., Pearson, P. N., Huber, B. T. & Berggren, W. A. (eds) Atlas of Oligocene Planktonic Foraminifera. Cushman Foundation for Foraminiferal Research, Special Publication . 46(Chap 20): 511-524. gs Jenkins, D. G. (1966b). Planktonic foraminiferal zones and new taxa from the Danian to lower Miocene of New Zealand. New Zealand Journal of Geology and Geophysics. 8 [1965](6): 1088-1126. gs References:
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Globigerinoides inusitatus compiled by the pforams@mikrotax project team viewed: 16-2-2025
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