Watznaueriaceae


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

Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa
Circular watznaueriacean placolith coccoliths.

Circular watznaueriacean placolith coccoliths.



Taxonomy:

Citation: Watznaueriaceae Rood et al., 1971
Rank: Family
Notes & discussion: Coccoliths are highly birefringent in XPL.

Distinguishing features: 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:
TagsLITHS: placolith, circular, CA: Placoliths: closed,
CSPH: spherical, monomorphic, V-UNITS: mid-tube, R-UNITS: distal shield, inner-tube, prox shield, DETAILS: rim-unicyclic,
MetricsLith size: 4->8µm;
Sources:
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 range of species in this database
First occurrence (base): in upper part of Bajocian Stage (81% up, 168.7Ma, in Bajocian stage). Data source: Total of range 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

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


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Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 19-8-2019

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Short stable page link: http://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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