Cruciplacolithus tenuis

Heliorthus tenuis Stradner, 1961

Coccolithus helis Stradner in Gorbhardt, 1963

Cruciplacolithus notus Perch-Nielsen, 1977a

Large (>7.0µm] species of Cruciplacolithus has an axial cross with disjunct feet-like extensions where they meet the tube cycle.

Romein, 1979 re-analysed the holotype and amended the description of Cruciplacolithus tenuis to include feet-like extensions. The original publication fails to recognise the feet-like extensions. Romein (personal com. on 23 Jan 2022) re-confirmed that Dr H. Stradner kindly provided the type slide with the marked location of the holotype of Cruciplacolithus tenuis.

The lectotype designated by Stradner et al., 2010 is superfluous because they do not provide any other information than the lectotype photo.

Gohrbandt, K., 1963. Zur Gliederung des Palaogen im Helvetikum nordlich Salzburg nach planktonischen Foraminiferen. Mitteilungen der Geologischen Gesellschaft in Wien 56, 1-116.

Hay, W. W., Mohler, H. P., Roth, P. H., Schmidt, R. R., Boudreaux, J. E., 1967. Calcareous nannoplankton zonation of the Cenozoic of the Gulf Coast and Caribbean-Antillean area, and transoceanic correlation. - Transactions of the Gulf-Coast Association of Geological Societies 17, 428-480.

Perch-Nielsen, K.,1977a. Albian to Pleistocene calcareous nannofossils from the Western South Atlantic, DSDP Leg 39. Initial Reports of the Deep Sea Drilling Project. 39, 699-823.

Stradner, H., 1961. Vorkommen von Nannofossilien im Mesozoikum und Alttertiär. Erdoel-Zeitschrift 77(3), 77-88.

Stradner, H., Aubry, M. -P., Bonnemaison, M., 2010. Calcareous nannofossil type specimens in the collection of the Geological Survey of Austria: A taxonomic and stratigraphic update. Jahrbuch der Geologischen Bundesanstalt 150(1-2), 9-84.