Watznaueriales


Ancestry: Mesozoic -> Watznaueriales
Sister taxa: Arkhangelskiales, Eiffellithales, Stephanolithiales, Podorhabdales, Watznaueriales, Syracosphaerales, Heterococcoliths inc sedis, Holococcoliths, Braarudosphaerales, Nannoliths inc sedis, Mesozoic non–coccoliths, hidden,

Short diagnosis: 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.


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

Taxonomy:

Citation: Watznaueriales Bown, 1987
Rank: Order

Farinacci & Howe catalog pages:

Short diagnosis: 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.


Morphology remarks: 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.

Geological Range:
Last occurrence (top): within Ypresian Stage (47.84-55.96Ma, top in Ypresian stage). Data source: Total of range of species in this database
First occurrence (base): within Hettangian Stage (199.30-201.30Ma, base in Hettangian 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.

Bown, P.R., (1987). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology, 38: 118 p.

Bown, P.R., (1987). The structural development of Early Mesozoic coccoliths and its evolutionary and taxonomic significance. Abhandlung der Geologischen Bundesanstalt, 39: 33-49.


Nannotax3 - Mesozoic - Watznaueriales by: Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 30-5-2017

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