Calculites suturus


Classification: Mesozoic -> Holococcoliths -> Common genera -> Calculites -> Calculites suturus
Sister taxa: C. favosus, C. anfractus, C. axosuturalis, C. obscurus, C. ovalis, C. rosalyniae, C. additus, C. cenomanicus, C. cyclops, C. juliae, C. maghredaswampensis, C. paulus, C. percernis, C. proscissus, C. turonicus, C. sarstedtensis, C. suturus, C. sp.,

Distinguishing features: Small holococcoliths with a rim, and central-area plate divided by a distinct, longitudinal suture.


Taxonomy:

Citation: Calculites suturus Bown & Concheyro, 2004
Rank: Species
Notes & discussion: Included within the genus Calculites, but no close relationship with other Calculites species is inferred.

Farinacci & Howe catalog pages: Calculites suturus *

Distinguishing features: Small holococcoliths with a rim, and central-area plate divided by a distinct, longitudinal suture.


Morphology remarks: The relatively narrow rim is bright in PC, and at 45˚ in XPL. The rim and plate are close to crystallographically-continuous, and appear almost continuous at 0˚ in XPL; in this position two distinct rim-blocks appear at either end of the coccolith. The central-area is filled by a plate which is bisected by a longitudinal suture, best seen in PC. In XPL, the plate is brightest at 0˚ and dark at 45˚ but the suture is always visible.

Size: Length 3.8-4.0 microns

Search data:
TagsLITHS: holococcolith, elliptical, CA: pores, R-UNITS: R-prominent, DETAILS: ca_conjunct, rim-unicyclic,
MetricsLith size: 3->4µm; Segments: 1->1;
Sources: original description
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Late Hauterivian Substage (130.77-133.09Ma, top in Hauterivian stage). Data source: Bown & Concheyro, 2004
First occurrence (base): within Early Hauterivian Substage (133.09-133.88Ma, base in Hauterivian stage). Data source: Bown & Concheyro, 2004

Plot of occurrence data:

  • (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Calculites

    References:

    Bown, P. R. & Concheyro, A. (2004). Lower Cretaceous calcareous nannoplankton from the Neuquen Basin, Argentina. In, Villa, G. , Lees, J. A. & Bown, P. R. (eds) Calcareous Nannofossil Palaeoecology and Palaeocenographic Reconstructions, Proceedings of the INA9 conference, Parma 2002. Marine Micropaleontology. 52(1-4): 51-84. gs :: ::

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    Calculites suturus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-6-2020

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