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Test very low, trochoidal, composed of two and a half whorls. Both sides generally rather flat. The older spiral or the dorsal side varies a little in height: from a slightly convex to a slightly concave one . Chambers 5 , occasionally 6 in the last whorl. Chambers increase in size uniformly as added, sometimes there is a leap in their increase at the passage to the last whorl and then the older tiny chambers form the concave dorsal side. Chambers on the dorsal side rather flat, usually broader than high, occasionally with equal diameters. On the ventral side the chambers slightly convex in the last whorl, more convex axially and slightly elongated towards the umbilical depression. Hence, the transverse axial sections of chambers in the last whorl are triangulate with the apex rounded. while the periphery is distinctly angled though rounded in axial section. ln other words the periphery between the dorsal and the ventral side is rounded but very pronounced, characteristic of the genus Turborotalia. In equatorial section the test generally globular or slightly ovate, the periphery and the sutures between the whorls moderately angled, broadly arched in outline. Sutures between chambers radial, on the dorsal sick insignificantly angled, in opposition to those on the ventral side. Umbilical depression small and shallow. Aperture a narrow slit at the base of the last chamber, extending from the umbilical depression to the periphery, with a very narrow often obscured unporous lip. Wall of test smooth, glossy and transparent.
Size: Dimensions: Longest diameter 0.17-0.22 mm.: shortest diameter 0.12-0.20 mm.: height of test 0.04-0.1:2 mm.
Extra details from original publication
Remarks. - The above species differs distinctly from the species Globigerina postcretacea Myatliuk = G. subcretacea Lomnicki. Generic differences are those most readily seen in these species. G. subcretacea displays features characteristic of the genus Globigerina broadly rounded margins, wholly unangulate periphery in axial section and aperture directed distinctly towards the umbilical depression. Moreover, G. subcretacea, in conformity with the definition of the younger synonym of this species (E. V. Myiatliuk - G. postcretacea) is 'slightly compressed vertically to the axis of the whorl' and, therefore, both its ventral and dorsal side is strongly convex, while Turborotalia bannerblowi is distinctly flat in shape. Moreover, there are significant differences in the structure of the test wall
Berggren & Wade (2018) suggested this is most likely a junior synonym of a Tenuitella species:
We were unable to obtain SEM images of ‘Turborotalia’ bannerblowi as part of this investigation and therefore we have re-illustrated the original light microscope images of the umbilical and spiral view in Plate 20.1, Figs. 1, 2. The morphology of this form bears close resemblance to and may be a junior synonym of Tenuitella gemma (Jenkins) or possibly Tenuitella angustiumbilicata (Bolli) but this cannot be confirmed without new examination of the holotype. We retain the species in Problematica pending further investigations. [Berggren & Wade 2018]
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 V O Blaicher, J. (1970). "Globigeryny" podmenilitowych margli globigeryn owych. Biuletyn Panstwowego Instytutu Geologicznego. 221(5): 137-204. gs
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 V O
Blaicher, J. (1970). "Globigeryny" podmenilitowych margli globigeryn owych. Biuletyn Panstwowego Instytutu Geologicznego. 221(5): 137-204. gs
Turborotalia bannerblowi compiled by the pforams@mikrotax project team viewed: 30-7-2021
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