INA16 Athens - September 2017

Chiasmolithus titus

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

Taxonomy:

Farinacci & Howe catalog pages: Chiasmolithus titus *

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

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:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Interpret with caution & read these notes
• Taxon plotted: Chiasmolithus titus, synonyms included - Chiasmolithus titus; Sullivania titus; Parent: C. consuetus group

Nannotax3 - Coccolithophores - Chiasmolithus titus by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 29-6-2017

Weblink to this page: ina.tmsoc.org/Nannotax3/link.php?taxon=Chiasmolithus_titus Cite this page - citation notes

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Vann Smith (New Orleans, US)

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

15th March 2017 8:29pm

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] 

16th March 2017 9:54am

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