Biscutum centriperforatus

(Burns, 1976) Varol, n. comb. Jan 13, 2026

Set number: 2763

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10µm

Biscutum centriperforatus, Late Cenomanian, Paipa Creek, Colombia

Set number: 2764

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10µm

Biscutum centriperforatus, Early Coniacian, Mauritania, West Africa

Set number: 2762

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Biscutum centriperforatus, Late Albian, Arabian Peninsula (The specific location cannot be disclosed)

Set number: 2761

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Biscutum centriperforatus, Late Albian, Arabian Peninsula (The specific location cannot be disclosed)

Set number: 2760

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10µm

Biscutum centriperforatus, Late Albian, Arabian Peninsula (The specific location cannot be disclosed)

Final Epithet

Biscutum centriperforatus (Burns, 1976) Varol, n. comb.

Basionym

Cenorbiculus centriperforatus Burns, 1976

Synonyms

Discorhabdus hannibalis Aguado, 2012

Holotype

Size: 5.0 µm; number of segments in the distal shield: ¬12

Optical Properties

In plan view under XPL, the distal shield is in constant extinction because the optic axis (c-axis) is perpendicular to the microscope stage, whereas the proximal shield displays a white interference colour and exhibits length-fast (–) elongation.

Remarks

The circular placolith has shields composed of approximately 10-16 segments. The tube cycle is indistinct under the light microscope and may be absent.

References

Aguado, R. 2012. Two new Cretaceous calcareous nannofossils from SE Spain and Tunisia. Journal of Nannoplankton Research. 32(2): 53-57.

Burns, D. A. 1976. Nannofossils from the Lower and Upper Cretaceous deposits, Nettleton, Lincolnshire, England. Revista Española de Micropaleontología. 8(2): 279-300.

Taxonomy

Biscutum

Biostratigraphy

Stratigraphic Range

Late Albian - Early Coniacian

Age (Ma)

107.59? - 88.90?

Holotype

Cenorbiculus centriperforatus

Early Cenomanian

Nettleton, Lincolnshire, England