Bussonius

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: Elliptical watznaueriacean coccoliths with broad V-unit cycle, which results in a three tiered placolith structure. Moderately birefringent in XPL.

Daughter taxa (time control age-window is: 0-800Ma)
				Bussonius fecheri Small (4-5µm) Bussonius with narrow shields and wide central area; distal shield closely appressed to proximal, 2-3 radial bars per quadrant.
				Bussonius prinsii Small (4-6µm) Bussonius with narrow shields and wide central area; distal shield elevated, 3-4   radial bars per quadrant.
				Bussonius leufuensis Medium-sized (6-7 µm) Bussonius with broad shields and relatively narrow central area.
				Bussonius sp. Specimens not identified to species level

Taxonomy:

Farinacci & Howe catalog pages: Bussonius *

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: Elliptical watznaueriacean coccoliths with broad V-unit cycle, which results in a three tiered placolith structure. Moderately birefringent in XPL.

Geological Range:
Last occurrence (top): at top of NJ8b subzone (100% up, 172.3Ma, in Aalenian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Pliensbachian Stage (184.20-192.90Ma, base in Pliensbachian 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

Bussonius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10145 Go to Archive.is to create a permanent copy of this page - citation notes

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