Perchnielsenella

Distinguishing features:
Parent taxon (Watznaueriaceae): Placoliths or modified placoliths with R-unit well developed, forming proximal and distal shield elements with opposite senses of imbrication; the V-unit typically forms a narrow distal cycle near the inner edge of the shield. Central-area structures are typically disjunct. Birefringent LM image, in which the V-unit cycle appears only as a thin, dark line.
This taxon: Medium to large, barrel-shaped coccoliths that are highly-birefringent and seen in both side and plan view.

Daughter taxa (time control age-window is: 0-800Ma)
				Perchnielsenella stradneri Medium to large, barrel-shaped coccoliths that are highly-birefringent and seen in both side and plan view. Narrow central area.
				Perchnielsenella sp. Specimens not identified to species level

Taxonomy:

Farinacci & Howe catalog pages: Perchnielsenella *

Distinguishing features:
Parent taxon (Watznaueriaceae): Placoliths or modified placoliths with R-unit well developed, forming proximal and distal shield elements with opposite senses of imbrication; the V-unit typically forms a narrow distal cycle near the inner edge of the shield. Central-area structures are typically disjunct. Birefringent LM image, in which the V-unit cycle appears only as a thin, dark line.
This taxon: Medium to large, barrel-shaped coccoliths that are highly-birefringent and seen in both side and plan view.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Campanian Stage (72.17-83.65Ma, base in Campanian stage). Data source: Total of ranges 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. See also: customisable plot Parent: Watznaueriaceae

Perchnielsenella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-5-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10867 Go to Archive.is to create a permanent copy of this page - citation notes

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