Watznaueriaceae

Daughter taxa (time control age-window is: 0-800Ma)					Granddaughter taxa
				Cyclagelosphaera Circular watznaueriacean placolith coccoliths.	Cyclagelosphaera alta Cyclagelosphaera colorata Cyclagelosphaera margerelii Cyclagelosphaera reinhardtii Cyclagelosphaera rotaclypeata Cyclagelosphaera sp.
				Tergestiella Circular watznaueriacean placolith coccoliths.	Tergestiella adriatica
				Watznaueria	Watznaueria coronata Watznaueria sp.

Taxonomy:

Distinguishing features:
Parent taxon (Mesozoic Survivors): Mesozoic taxa which occur in low abundances in the early Palaeogene.
This taxon: 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.

Original description: Elliptical or circular coccolithids having a coccolithid rim with crystallites oriented so that both shields produce an interference figure between crossed polarizers.

Farinacci & Howe catalog pages: Watznaueriaceae

Geological Range:
Notes: Coccoliths are highly birefringent in XPL. Common, sometimes dominant, through most of the Mesozoic (Pliensbachian to Maastrichtian) but rare in the Paleocene.
A single "living fossil" species Tergestiella adriatica has recently been rediscovered, see Hagino et al. (2015).
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within NJ11 zone (165.71-168.69Ma, base in Bajocian 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. For the customisable plot option go to a genus page Parent: Mesozoic Survivors

Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 14-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1493 Go to Archive.is to create a permanent copy of this page - citation notes

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