Chiasmolithus titus


Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Chiasmolithus -> C. consuetus group -> Chiasmolithus titus
Sister taxa: C. californicus, C. consuetus, C. danicus, C. nitidus, C. titus,

Distinguishing features: Medium to small Chiasmolithus with narrow central area spanned by one straight diagonal cross bar and one that is strongly bent/hooked.


Taxonomy:

Citation: Chiasmolithus titus Gartner, 1970
Rank: Species
Synonyms: Sullivania titus (Gartner, 1970) Varol, 1992

Farinacci & Howe catalog pages: Chiasmolithus titus *

Distinguishing features: Medium to small Chiasmolithus with narrow central area spanned by one straight diagonal cross bar and one that is strongly bent/hooked.

Search data:
TagsLITHS: placolith, elliptical, RIM: psh-bicyclic, CA: cross, cross-offset,
CSPH: spherical, monomorphic, V-UNITS: distal shield, px-tube, R-UNITS: c-str, ds-tube, prox shield, DETAILS: ca_disjunct, rim-bicyclic, isogyres oblique,
MetricsLith size: 7->9µm;
Sources: 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): within NP21 zone (32.92-34.44Ma, top in Rupelian stage). Data source: Perch-Nielsen 1985b
First occurrence (base): within NP15 zone (42.87-46.29Ma, base in Lutetian stage). Data source: Perch-Nielsen 1985

Plot of occurrence data:

References:

Gartner, S., (1970). Phylogenetic lineages in the Lower Tertiary genus Chiasmolithus. Proceedings of the North American Paleontological Convention, September 1969, G(930-957).

Perch-Nielsen, K., (1985). Cenozoic calcareous nannofossils. In: Bolli, H.M., Saunders, J.B. and Perch-Nielsen, K. (Editors), Plankton Stratigraphy. Cambridge University Press, Cambridge, pp. 427-555.

Varol, O., (1992). Sullivania a new genus of Palaeogene coccoliths. Journal of Micropalaeontology, 11: 141-150.

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Chiasmolithus titus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-7-2018

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Vann Smith (New Orleans, US)

How is Chiasmolithus titus distinguished from C. nitidus? They look very similar to me.

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Jeremy Young

Vann - fair point they are every similar. They are being separated based on C. titus having one crossbar that is really hook-shaped (and the other more or less straight) as opposed to C. nitidus having one crossbar that is curved (and the other more or less straight). Dunkley Jones et al. (2009) use this explicitly and it does correspond to the original descriptions. [NB I have now edited the diagnoses slighlty to make this clearer] 

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