Orastrum porosuturalis


Classification: Mesozoic -> Holococcoliths -> Common genera -> Orastrum -> Orastrum porosuturalis
Sister taxa: O. asarotum, O. campanensis, O. porosuturalis, O. perspicuum, O. robinsonii, O. colligatum, O. sp.,

Distinguishing features: Central plate of 4, low birefringence, blocks - one per quadrant, pores along the sutures. Medium sized (ca 4-8 µm)


Taxonomy:

Citation: Orastrum porosuturalis (Bukry, 1969) Farhan et al., 1994
Rank: Species
Basionym: Discolithina porosuturalis Bukry, 1969

Farinacci & Howe catalog pages: Discolithina porosuturalis *

Distinguishing features: Central plate of 4, low birefringence, blocks - one per quadrant, pores along the sutures. Medium sized (ca 4-8 µm)

Search data:
TagsLITHS: holococcolith, elliptical, V-UNITS: V-prominent, R-UNITS: R-prominent, DETAILS: ca_disjunct, rim-unicyclic,
MetricsLith size: 4->8µm; Segments: 4->4;
Sources: original description & illustrated specimens
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within Campanian Stage (72.05-83.64Ma, top in Campanian stage). Data source: Burnett 1998
First occurrence (base): within Santonian Stage (83.64-86.26Ma, base in Santonian stage). Data source: Burnett 1998

Plot of occurrence data:

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

    References:

    Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs :: ::

    Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs :: ::

    Farhan, A. J., Burnett, J. A., Bown, P. R. & Lord, A. R. (1994). Holococcoliths from the Upper Cretaceous of Alabama and Mississippi (USA). Cahiers de Micropaleontologie. 9(57-73): -. gs :: ::


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    Orastrum porosuturalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 4-7-2020

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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10826 Go to Archive.is to create a permanent copy of this page - citation notes



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