Nannotax3 - ntax_cenozoic - Watznaueriaceae Nannotax3 - ntax_cenozoic - Watznaueriaceae

Watznaueriaceae


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

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:

References:

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


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Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-4-2024

Taxon Search:
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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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