Nannotax3 - ntax_mesozoic - Watznaueriaceae

Watznaueriaceae


Classification: ntax_mesozoic -> Watznaueriales -> Watznaueriaceae
Sister taxa: Watznaueriaceae

Distinguishing features:
Parent taxon (Watznaueriales): Placolith (or modified placolith) coccoliths with a distal cycle of clockwise-imbricating elements. R-units well developed, forming proximal and distal shield elements with opposite senses of imbrication; V-units typically form a narrow distal cycle near the inner edge of the shield.
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.


Daughter taxa (time control age-window is: 0-800Ma)Granddaughter taxa
Regular placoliths
Bussonius
Elliptical watznaueriacean coccoliths with broad V-unit cycle, which results in a three tiered placolith structure. Moderately birefringent in XPL.
B. fecheri
B. prinsii
B. leufuensis
B. sp.

Cyclagelosphaera
Circular watznaueriacean coccoliths.

Diazomatolithus
Modified watznaueriacean coccoliths with one conical/flaring (proximal) shield with elements joined along oblique sutures, and a smaller, flatter (distal) shield with the principle elements joined along near radial sutures. Usually circular with a central opening.
D. galicianus
D. lehmanii
D. sp.

Lotharingius
Elliptical watznaueriacean coccoliths typically with central-area axial cross, with or without additional lateral bars. Cross usually spine bearing. Extinction figure with nearly straight arms. 
L. hauffii
L. frodoi
L. umbriensis
L. crucicentralis
L. sigillatus
L. barozii
L. primitivus
L. velatus
L. sp.

Watznaueria
Elliptical watznaueriacean coccoliths with central-areas that are typically closed or narrow but may be spanned by transverse bar, bars or grill.  Extinction figure with clearly inflected arms.

Elevated taxa
Ansulasphaera
Watznaueriacean coccoliths with a tube-like/conical proximal shield.
A. bownii
A. covingtonii
A. helvetica
C. nudus
A. sp.

Bibreviconus
High, cylindrical morphology with a peg-like distal cycle; possibly the isolated central part of Cyclagelosphaera deflandrei specimens which have lost the shields.
B. atlanticus
B. sp.

Perchnielsenella
Medium to large, barrel-shaped coccoliths that are highly-birefringent and seen in both side and plan view.
P. stradneri
P. sp.

Taxonomy:

Citation: Watznaueriaceae Rood et al., 1971
Rank: Family
Type species: Watznaueria Reinhardt, 1964.

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

Distinguishing features:
Parent taxon (Watznaueriales): Placolith (or modified placolith) coccoliths with a distal cycle of clockwise-imbricating elements. R-units well developed, forming proximal and distal shield elements with opposite senses of imbrication; V-units typically form a narrow distal cycle near the inner edge of the shield.
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.


Morphology: Coccoliths are highly birefringent in XPL. Common, sometimes dominant, through most of the Mesozoic (Pliensbachian to Maastrichtian).

Search data:
TagsLITHS: placolith,
MetricsLith size: 0->0µm;
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in lower part of Ypresian Stage (22% up, 54.2Ma, in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Pliensbachian Stage (0% up, 190.8Ma, in Pliensbachian 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

Reinhardt, P. (1964). Einige Kalkflagellaten-Gattungen (Coccolithophoriden, Coccolithineen) aus dem Mesozoikum Deutschlands. Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 6: 749-759. gs V O

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


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Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11314 Go to Archive.is to create a permanent copy of this page - citation notes



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