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.	Bussonius fecheri Bussonius prinsii Bussonius leufuensis Bussonius sp.
				Cyclagelosphaera Circular watznaueriacean coccoliths.	Cyclagelosphaera margerelii Cyclagelosphaera alta Cyclagelosphaera reinhardtii Cyclagelosphaera rotaclypeata Cyclagelosphaera shenleyensis Cyclagelosphaera argoensis Cyclagelosphaera jiangii Cyclagelosphaera lacuna Cyclagelosphaera wiedmannii Cyclagelosphaera brezae Cyclagelosphaera centrumelliptica Cyclagelosphaera deflandrei Cyclagelosphaera platyaspis Cyclagelosphaera sp.
				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.	Diazomatolithus galicianus Diazomatolithus lehmanii Diazomatolithus 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.	Lotharingius hauffii Lotharingius frodoi Lotharingius umbriensis Lotharingius crucicentralis Lotharingius sigillatus Lotharingius barozii Lotharingius primitivus Lotharingius velatus Lotharingius 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.	Watznaueria barnesiae Watznaueria fossacincta Watznaueria leesiae Watznaueria moshkovitzii Watznaueria ovata Watznaueria supracretacea Watznaueria britannica Watznaueria reinhardtii Watznaueria biporta Watznaueria cynthae Watznaueria contracta Watznaueria okadai Watznaueria quadriradiata Watznaueria fasciata Watznaueria rawsonii Cyclagelosphaera baticlypeata Watznaueria sp.
				Elevated taxa
				Ansulasphaera Watznaueriacean coccoliths with a tube-like/conical proximal shield.	Ansulasphaera bownii Ansulasphaera covingtonii Ansulasphaera helvetica Cylindralithus nudus Ansulasphaera 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.	Bibreviconus atlanticus Bibreviconus sp.
				Perchnielsenella Medium to large, barrel-shaped coccoliths that are highly-birefringent and seen in both side and plan view.	Perchnielsenella stradneri Perchnielsenella sp.

Taxonomy:

Farinacci & Howe catalog pages: 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.

Morphology:

Geological Range:
Last occurrence (top): at top of NP10 zone (100% up, 54.2Ma, in Ypresian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Pliensbachian Stage (184.20-192.90Ma, base in Pliensbachian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Neptune data: this is a higher taxon page so Neptune data is not plotted. For the customisable plot option go to a genus page Parent: Watznaueriales

Watznaueriaceae compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 10-9-2024 Taxon Search: Advanced Search 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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