Nannotax3 - ntax_mesozoic - Arkhangelskiales

Arkhangelskiales

Classification: ntax_mesozoic -> Arkhangelskiales
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Syracosphaerales, Heterococcoliths inc sedis ⟩⟨ Holococcoliths, Braarudosphaerales, Nannoliths inc sedis, Mesozoic non–coccoliths, hidden

Distinguishing features: Tiered placoliths with 3-5 closely-appressed shields.

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	Arkhangelskiellaceae Arkhangelskielids with shields predominantly formed of R-units, thus bright in cross-polarised light; V-units often form dark outer rim.	Arkhangelskiella Broinsonia Thiersteinia
	Kamptneriaceae Arkhangelskielids with shields predominantly formed of V-units, thus dark in cross-polarised light; R-units form bright band at core of shield.	Crucicribrum Gartnerago Kamptnerius Senilatus

Taxonomy:

Citation: Arkhangelskiales Bown & Hampton, 1997 in Bown & Young, 1997

Rank: Order

Farinacci & Howe catalog pages: Arkhangelskiales

Distinguishing features: Tiered placoliths with 3-5 closely-appressed shields.

Morphology: Central-area structures include transverse bars with proximal net; axial or near axial crosses with proximal net; and perforate plates crossed by axial or near axial sutures. LM images vary significantly, from predominantly dark in the Kamptneriaceae, to predominantly bright in the Arkhangelskiellaceae.
The Kamptneriaceae appears to have originated from loxolith coccoliths, and the tiered placolith rim structure is actually a modified loxolith construction. The earliest representatives of the family are only slightly modified loxolith coccoliths.

Search data:

Tags	LITHS: placolith,
Metrics	Lith size: 0->0µm;

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Valanginian Stage (0% up, 139.4Ma, in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: ntax_mesozoic

References:

Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs V O

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Arkhangelskiales compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-4-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10034 Go to Archive.is to create a permanent copy of this page - citation notes

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