Nannotax3 - ntax_cenozoic - Watznaueriaceae Nannotax3 - ntax_cenozoic - Watznaueriaceae


Classification: ntax_cenozoic -> Mesozoic Survivors -> Watznaueriaceae
Sister taxa: Biscutaceae, Chiastozygaceae, Markalius, Watznaueriaceae

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

Circular watznaueriacean placolith coccoliths.
Tergestiella adriatica


Watznaueria coronata
Watznaueria sp.


Citation: Watznaueriaceae Rood et al., 1971
taxonomic rank: Family
Taxonomic discussion: Coccoliths are highly birefringent in XPL.

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.

Farinacci & Howe catalog pages: Watznaueriaceae [no catalog entry yet]

Search data:
Lith size: 4->8µm;
The morphological data given here can be used on the advanced search page. See also these notes

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:


Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O

Hagino, K. et al. (2015). Re-discovery of a “living fossil” coccolithophore from the coastal waters of Japan and Croatia. Marine Micropaleontology. 116(1): 28-37. gs

Rood, A. P., Hay, W. W. & Barnard, T. (1971). Electron Microscope Studies of Oxford Clay Coccoliths. Eclogae Geologicae Helvetiae. 64: 245-272. gs O


Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-5-2024

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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