Cruciplacolithus tarquinius

Classification: Coccolithophores -> Coccolithales -> Coccolithaceae -> Cruciplacolithus -> Cruciplacolithus tarquinius
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.,


Citation: Cruciplacolithus tarquinius Roth & Hay in Hay et al. 1967
Rank: Species
Synonyms: Cruciplacolithus nebulosus Shamrock & Watkins 2012 [my interpretation Young 2015 - Roth's holotype of C. tarquinius perfectly matches this species]
Stauronertha tarquinius (Hay and Roth in Hay et al., 1967) Aubry, in Aubry & Bord 2009 [NB The reason for including this species in Stauronertha, which is based on C. neohelis, is not given]
Notes & discussion: Cruciplacolithus tarquinius is not a well-established species but the type illustration is very clear.

Distinguishing features: Medium sized Eocene-Oligocene Cruciplacolithus with delicate axial cross

Farinacci & Howe catalog pages: Cruciplacolithus tarquinius * , Cruciplacolithus nebulosus *

Morphology remarks: "The central cross is extremely delicate and may be absent even in relatively well-preserved material, but can be indicated by the four, birefringent points of attachment that remain along the collar." It "can be readily differentiated from other species of Cruciplacolithus by size and stratigraphic range, as well as the distinct, ‘fuzzy’ appearance of the shield." It "can be differentiated from Bramletteius serraculoides, which also bears a delicate axial cross, by the notably wider shield of the former." - from description of C. nebulosus by Shamrock & Watkins (2012)

Search data:
TagsLITHS: placolith, elliptical, RIM: psh-bicyclic, CA: cross, cross-axial,
CSPH: spherical, equant, monomorphic, V-UNITS: distal shield, px-tube, V-prominent, R-UNITS: c-str, ds-tube, prox shield, R-prominent, DETAILS: ca_disjunct, rim-bicyclic, isogyres oblique,
MetricsLith size: 4->7µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Oligocene Epoch (23.03-33.89Ma, top in Chattian stage). Data source: original description
First occurrence (base): within NP14a subzone (47.84-49.11Ma, base in Ypresian stage). Data source: Shamrock & Watkins 2012

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Note to users in China - the diagram may not plot unless you use a VPN since I use google services on the website. If this is a problem please contact me 谢谢.
  • Taxon plotted: Cruciplacolithus tarquinius, synonyms included - Cruciplacolithus tarquinius;
  • space-time plot :: Samples map :: Parent: Cruciplacolithus


    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 :: ::

    Shamrock, J. L. & Watkins, D. K. (2012). Eocene calcareous nannofossil biostratigraphy and community structure from Exmouth Plateau, Eastern Indian Ocean (ODP Site 762). Stratigraphy. 9(1): 1-11. gs :: ::


    Cruciplacolithus tarquinius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 5-6-2020

    Taxon Search:
    Advanced Search

    Short stable page link: Go to to create a permanent copy of this page - citation notes

    Comments (0)

    No comments yet on this page. Please do add comments if you spot any problems, or have information to share

    Add Comment

    * Required information
    Captcha Image
    Powered by Commentics