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Watznaueria

Classification: ntax_main -> Mesozoic nannofossils -> Watznaueriales -> Watznaueriaceae -> Watznaueria
Sister taxa: Tergestiella ⟩⟨ Bussonius, Cyclagelosphaera, Diazomatolithus, Lotharingius, Watznaueria ⟩⟨ Ansulasphaera, Bibreviconus, Perchnielsenella

Daughter taxa (time control age-window is: 0-800Ma)		Granddaughter taxa
	Species without central structure
	Watznaueria barnesiae Central-area closed or very narrow, with no central area structures.
	Watznaueria coronata
	Watznaueria fossacincta Watznaueria with a narrow central-area opening with no central area structures.
	Watznaueria leesiae Like W. barnesiae but >8 µm long, Late Cretaceous
	Watznaueria moshkovitzii Very large 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.
	Watznaueria supracretacea Watznaueria-like in appearance but appear flat and have relatively large, visible rim elements.
	Species with disjunct bar
	Watznaueria britannica Watznaueria with narrow central-area spanned by a transverse bar.	Watznaueria britannica subsp. britannica Watznaueria britannica subsp. minor Watznaueria gaetani Ellipsagelosphaera clausa Ellipsagelosphaera 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 imperceptible or weakly birefringent.
	Cyclagelosphaera baticlypeata Watznaueria with broad central-area spanned by radial bars
	Watznaueria sp. Specimens not identified to species level

Bown&Young1997 f6 06.jpg

Taxonomy:

Citation: Watznaueria Reinhardt, 1964

Taxonomic rank: genus

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

Synonyms:

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

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.

Distinguishing features:
Parent taxon (Watznaueriaceae): 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.
This taxon: 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.

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

Morphology:

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:

Lith size: 4->12µm;
Data source notes: 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 Danian Stage (100% up, 61.6Ma, in Selandian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NJ8b subzone (172.30-175.79Ma, base in Toarcian 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. 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 O

Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs

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

Noël, D. (1965). Sur les Coccolithes du Jurassique Européen et d'Afrique du Nord. Essai de classification des coccolithes fossiles. Éditions du Centre National de la Recherche Scientifique, Paris. 1-209. 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

Watznaueria compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-7-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=11298 Go to Archive.is to create a permanent copy of this page - citation notes

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