Watznaueriaceae


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

Short diagnosis: 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.


Daughter taxa (blue => in age window 0-300Ma) 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.

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

Short diagnosis: 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.

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): within Bajocian Stage (168.28-170.30Ma, base 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. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

Hagino, K.; Young, J.R.; Bown, P.R.; Godrijan, J.; Kulhanek, D.K.; Kogane, K. & Horiguchi, T., (2015). Re-discovery of a “living fossil” coccolithophore from the coastal waters of Japan and Croatia. Marine Micropaleontology, 116(1): 28-37.

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


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Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 26-9-2017

Taxon Search:
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