Calcicalathina oblongata

(Worsley, 1971) Thierstein, 1971 Jan 22, 2026

Set number: 2871

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10µm

Calcicalathina oblongata, Early Valanginian, DSDP Leg 76, Site 534, Blake-Bahama Basin, Atlantic Ocean

Set number: 2870

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10µm

Calcicalathina oblongata, Early Hauterivian, Angles, SE France

Set number: 2865

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10µm

Calcicalathina oblongata, Late Hauterivian / Early Barremian, Eastern Gulf of Mexico

Set number: 2869

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10µm

Calcicalathina oblongata, Early Valanginian, DSDP Leg 76, Site 534, Blake-Bahama Basin, Atlantic Ocean

Set number: 2868

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10µm

Calcicalathina oblongata, Early Hauterivian, Eastern Gulf of Mexico

Set number: 2867

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10µm

Calcicalathina oblongata, Late Hauterivian - Early Barremian, Eastern Gulf of Mexico

Set number: 2866

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10µm

Calcicalathina oblongata, Late Hauterivian / Early Barremian, Eastern Gulf of Mexico

Final Epithet

Calcicalathina oblongata (Worsley, 1971) Thierstein, 1971

Basionym

Schizosphaerella oblongata Worsley, 1971

Optical Properties

The wall remains in constant extinction, with its optic axis (c‑axis) oriented perpendicular to the microscope stage, whereas the central area shows strong birefringence, exhibiting 1st‑order yellow interference colours.

Remarks

Large (8.0–14.0 µm) species of Calcicalathina consist of a high, narrow wall and a wide, dome‑shaped, granulated central area that distally rises above the wall. Calcicalathina oblongata frequently settles on either side or in plan view owing to its similar height‑to‑width ratio. No distal process is present in the specimens examined.

References

Worsley, T. R., 1971. Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In: Farinacci, A. (ed.), Proceedings of the Second Planktonic Conference Roma 1970. Edizioni Tecnoscienza, Rome vol. 2, pp. 1301-1321.

Thierstein, H. R., 1971. Tentative Lower Cretaceous Calcareous Nannoplankton Zonation. Eclogae Geologicae Helvetiae 64, 459-488.

Taxonomy

Calcicalathina

Biostratigraphy

Stratigraphic Range

Early Valanginian - Early Barremian

Age (Ma)

137.41 - 125.42

Holotype

Schizosphaerella oblongata Worsley, 1971

Berriasian - Valanginian

DSDP Leg 1, Site ?, Caribbean Sea