Nannotax3 - Mesozoic - Watznaueria

Watznaueria

Classification: Mesozoic -> Watznaueriales -> Watznaueriaceae -> Watznaueria
Sister taxa: Bussonius, Cyclagelosphaera, Diazomatolithus, Lotharingius, Watznaueria, Ansulasphaera, Bibreviconus, Perchnielsenella,

Distinguishing features: 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.

Daughter taxa: (blue => in age window 0-800Ma)		Granddaughter taxa
	Species without central structure
	Watznaueria barnesiae Central-area closed or very narrow, with no central area structures.
	Watznaueria bayackii Watznaueria-like in appearance but appear flat and have relatively large, visible rim elements.
	Watznaueria fossacincta Watznaueria with a narrow central-area opening with no central area structures.
	Watznaueria manivitiae Large (>9µm) Watznaueria with central-area that is closed or with only very narrow opening, with no central area structures.
	Watznaueria ovata Watznaueria with a wide, vacant central area; c. area width >= rim width.
	Species with disjunct bar
	Watznaueria britannica Watznaueria with narrow central-area spanned by a transverse bar.	E. clausa E. supergesta
	Watznaueria reinhardtii Watznaueria with wide central-area spanned by a slightly oblique, narrow transverse bar that broadens at both ends.
	Species with conjunct bar
	Watznaueria biporta Large (8-12 µm) Watznaueria with two well-defined pores separated by a conjunct transverse bar.
	Watznaueria cynthae Large, broadly elliptical with two variably developed central pores that pierce the inner cycle.
	Species with axial cross
	Watznaueria contracta Medium to large, broadly elliptical Watznaueria with narrow central area almost filled with axial cross bars.
	Watznaueria okadai Watznaueria species with sub-axial cross in the central area, long axis crossbar sigmoidal.
	Watznaueria quadriradiata Small-medium sized Watznaueria with narrow central area spanned by axial cross bars.
	Species with grill
	Watznaueria fasciata Small (3-5 µm) Watznaueria with relatively wide central-area spanned by around 5 parallel transverse bars.
	Watznaueria rawsonii Small-medium sized (4-6µm) Watznaueria with relatively wide central area (approximately the same width as the rim) spanned by an irregular grill of blocky laths. In LM the grill is impercetible or weakly birefringent.
	Cyclagelosphaera baticlypeata Watznaueria with broad central-area spanned by radial bars
	Watznaueria sp. Specimens not identified to species level

Taxonomy:

Citation: Watznaueria Reinhardt, 1964

Rank: Genus

Type species: Tremalithus barnesae Black, 1959 (= the junior synonym of Watznaueria angustoralis Reinhardt, 1964, the original designation) designated by Perch-Nielsen, 1968.

Variants:

Ellipsagelosphaera Noël, 1965. This name has been used in various senses but the type species E. frequens (a junior synonym of W. britannica) unambiguously has a disjunct bar and so the name could be used for species with this character. Varol & Bowman (2019) use the name in this sense.

Synonyms:

Colvillea Black 1964
Caterella Black, 1971a
Calolithus Noël, 1965
Maslovella Tappan & Loeblich 1966
Margolatus Forchheimer 1972
Coptolithus Black, 1973
Actinosphaera Noël 1965

Farinacci & Howe catalog pages: Watznaueria * , Ellipsagelosphaera * , Actinosphaera * , Caterella * , Calolithus * , Coptolithus * , Colvillea * , Maslovella * , Margolatus *

Morphology remarks: The generic concepts applied to these kinds of coccoliths have been rather inconsistently applied with different kinds of central area bars used as diagnostic characters (e.g., Ellipsagelosphaera for forms with transverse bars). Here we use Watznaueria in a broad sense, but retain Lotharingius for the oldest, early Jurassic, representatives, and Cyclagelosphaera for circular forms.

Search data:

Tags	LITHS: placolith, CSPH: equant, monomorphic,
Metrics	Lith size: 4->12µm; Sources: size range of included species

The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Aalenian Stage (62% up, 171.8Ma, in Aalenian stage). Data source: Total of range 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. See also: customisable plot Parent: Watznaueriaceae

References:

Black, M. (1971a). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society. 38: 381-424. gs

Black, M. (1973). British Lower Cretaceous Coccoliths. I-Gault Clay (Part 2). Palaeontographical Society Monograph. 127: 49-112. gs

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

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs

Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Éditions du Centre National de la Recherche Scientifique, Paris. -. 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