Grantarhabdus bukryi

Grantarhabdus bukryi Black, 1972a

Small (<8.0 µm) species of Grantarhabdus characterised by a symmetrical diagonal cross.

The entire species exhibits first-order, slightly greyish-white interference colours. The pelaga of Grantarhabdus bukryi exhibits inclined extinction and length-fast (-) elongation in its natural settling position, as seen in plan view under crossed polars.

Grantarhabdus bukryi is distinguished from Grantarhabdus coronadventis by its smaller size.

Grantarhabdus bukryi differs from the Berriasian to late Hauterivian Grantarhabdus quadratus in having a larger central area and narrower shields. Moreover, Grantarhabdus bukryi is separated from Grantarhabdus quadratus by a large stratigraphic interval.

Bergen, J. A. 1994. Berriasian to early Aptian calcareous nannofossils from the Vocontian Trough (SE France) and Deep Sea Drilling Site 534: new nannofossil taxa and a summary of low-latitude biostratigraphic events. Journal of Nannoplankton Research. 16(2): 59-69.

Black, M. 1971a. Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society 38: 381-424.

Black, M. 1972a. British Lower Cretaceous Coccoliths. I-Gault Clay (Part 1). Palaeontographical Society Monograph. 126: 1-48.

Grün, W. & Allemann, F. 1975. The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae, 68: 147-211.

Reinhardt, P. 1966b. Zur Taxonomie und Biostratigraphie des fossilen Nannoplanktons aus dem Malm, der Kreide und dem Alttertiär Mitteleuropas Freiberger Forschungshefte. C196: 5-109.

Worsley, T. R., 1971. Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In: Farinacci, A. (ed.), Proceedings of the Second Planktonic Conference Roma 1970. Edizioni Tecnoscienza, Rome vol. 2, pp. 1301-1321.