Watznaueria quadrata Worsley, 1971
The optical properties are comparable to those of Granthorhabdus.
Grantarhabdus quadratus differs from the Middle Albian to Early Cenomanian Grantarhabdus meddii in having a narrower central area and wider shields. Moreover, Grantarhabdus quadratus is separated from Grantarhabdus meddii 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.
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.