Calculites suturus


Classification: ntax_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
Taxonomic discussion: Included within the genus Calculites, but no close relationship with other Calculites species is inferred.

Farinacci & Howe catalog pages: C. suturus *

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


Morphology: 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: ca_conjunct, pores, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 3->4µm; Segments: 1->1;
Data source notes: 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:

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: 24-1-2021

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