Cruciplacolithus tenuis


Classification: ntax_cenozoic -> Coccolithales -> Coccolithaceae -> Cruciplacolithus -> Cruciplacolithus tenuis
Sister taxa: C. neohelis, C. kanungoi ⟩⟨ C. cruciformis, C. flavius, C. klausii, C. nishii, C. tarquinius ⟩⟨ C. asymmetricus, C. edwardsii, C. frequens ⟩⟨ C. intermedius, C. primus, C. subrotundus, C. tenuis ⟩⟨ C. filigranus, C. inseadus, C. latipons, C. sp.

Taxonomy:

Citation: Cruciplacolithus tenuis (Stradner, 1961) Hay and Mohler in Hay et al., 1967
Rank: Species
Basionym: Heliorthus tenuis Stradner, 1961
Synonyms:

Distinguishing features: Medium size to large (>7 µm) Cruciplacolithus with axial cross-bars that have disjunct, birefringent blocks (‘feet') where they meet the rim.

Farinacci & Howe catalog pages: H. tenuis * , C. helis * , C. notus *


Phylogenetic relations: Thought to have evolved from C. primus, via C. intermedia, by increase in size and development of 'feet'

Search data:
TagsLITHS: placolith, elliptical, CA: cross-axial,
CSPH: equant, monomorphic, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,
MetricsLith size: 7->14µm;
Data source notes: lith size from Romein 1979
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in mid part of NP9 zone (50% up, 56.5Ma, in Ypresian stage). Data source: Perch-Nielsen 1985, Varol, (1989, fig. 12.4)
First occurrence (base): at base of NP2 zone (0% up, 65.5Ma, in Danian stage). Data source: zonal marker

Plot of occurrence data:

References:

Bown, P. R. (2016). Paleocene calcareous nannofossils from Tanzania (TDP sites 19, 27 and 38). Journal of Nannoplankton Research. 36(1): 1-32. gs V O

Bown, P. R., Gibbs, S. J., Sheward, R., O’Dea, S. & Higgins, D. (2014). Searching for cells: the potential of fossil coccospheres in coccolithophore research. Journal of Nannoplankton Research. 34(special): 5-21. gs V O

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

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. gs V O

Mai, H., Hillebrandt-Habel, T., von Salis Perch-Nielsen, K. & Willems, H. (1998). Paleocene coccospheres from DSDP Leg 39, Site 356, Sao Paulo Plateau, S. Atlantic Ocean. Journal of Nannoplankton Research. 20(1): 21-29. gs V O

Müller, C. (1974b). Calcareous nannoplankton, Leg 25 (Western Indian Ocean). Initial Reports of the Deep Sea Drilling Project. 25: 579-633. gs V O

Okada, H. & Thierstein, H. R. (1979). Calcareous nannoplankton - Leg 43, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 43: 507-573. gs V O

Perch-Nielsen, K. (1972b). Remarks on Late Cretaceous to Pleistocene coccoliths from the North Atlantic. Initial Reports of the Deep Sea Drilling Project. 12: 1003-1069. gs V O

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. gs V O

Pospichal, J. J. & Wise, S. W. (1990a). Calcareous nannofossils across the K/T boundary, ODP hole 690C, Maud Rise, Weddell Sea. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 515-532. gs V O

Romein, A. J. T. (1979). Lineages in Early Paleogene calcareous nannoplankton. Utrecht Micropaleontological Bulletin. 22: 1-231. gs V O

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

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. gs V O

Thibault, N., Minoletti, F. & Gardin, S. (2018). Offsets in the early Danian recovery phase in carbon isotopes: Evidence from the biometrics and phylogeny of the Cruciplacolithus lineage. Revue de Micropaléontologie. 61(2): 207-221. gs

Varol, O. (1989c). Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. British Micropalaeontological Society Publication Series. 265-310. gs V O

Varol, O. (1998). Palaeogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 200-224. gs


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Cruciplacolithus tenuis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 28-2-2021

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