Watznaueria contracta
Classification: ntax_mesozoic -> Watznaueriales -> Watznaueriaceae -> Watznaueria -> Watznaueria contracta
Sister taxa: W. barnesiae, W. bayackii, W. fossacincta, W. manivitiae, W. ovata ⟩⟨ W. britannica, W. reinhardtii ⟩⟨ W. biporta, W. cynthae ⟩⟨ W. contracta, W. okadai, W. quadriradiata ⟩⟨ W. fasciata, W. rawsonii, C. baticlypeata, W. sp.
Distinguishing features: Medium to large, broadly elliptical Watznaueria with narrow central area almost filled with axial cross bars.
BownCooper 89-nspp-fig04.JPG
Mattioli96-fig1-8.JPG
BownCooper 89-nspp-fig05.JPG
BownCooper1998 4-15-13.jpg
BownCooper 89-nspp-fig01.JPG
BownCooper 89-nspp-fig02.JPG
BownCooper 89-nspp-fig03.JPG
BownCooper 89-nspp-fig06-7.JPG
BownCooper1998 4-07-16.jpg
BownCooper1998 4-07-17.jpg
BownCooper1998 4-15-12.jpg
BownCooper1998 4-15-14.jpg
BownCooper1998 4-15-15.jpg
Bownetal88pl1-21.JPG
Mattioli96 pl2-01.JPG
Mattioli96 pl2-02.JPG
Mattioli96 pl2-03.JPG
Mattioli96 pl2-04.JPG
Mattioli96 pl2-05.JPG
Mattioli96 pl2-06.JPG
Mattioli96 pl2-07.JPG
Mattioli96 pl2-08.JPG
Mattioli96 pl3-05.JPG
Mattioli96 pl3-07.JPG
TypeFig Lotharingius contractus 2.jpg
TypeFig Lotharingius contractus.jpg
TypeFig Lotharingius contractus_para.jpg
Taxonomy:
Citation: Watznaueria contracta (Bown & Cooper, 1989) Cobianchi et al. 1992Rank: SpeciesBasionym: Lotharingius contractus Bown & Cooper, 1989Variants:
- Watznaueria colacicchii Mattioli 1996 - smaller, central area more elliptical - this taxon was discussed at the Jurassic nanofossil workshop, Lyon 2016, and it was concluded that it was not significantly differently from L. contractus [JRY 2016]
Farinacci & Howe catalog pages: L. contractus * , W. colacicchii *
Distinguishing features: Medium to large, broadly elliptical Watznaueria with narrow central area almost filled with axial cross bars.
Morphology: This is a mid-Jurassic species associatied with the evolion of Watznaueria from Lotharingius and is well-separated in time from the later species with an axial cross.
Phylogenetic relations: Apparently a transitional form between Watznaueria and Lotharingius (Bown & Cooper 1988, p.39)
Search data:
| Tags | LITHS: placolith, elliptical, CA: cross-axial, ca_disjunct,
CSPH: equant, monomorphic, CROSS-POLARS: rim-unicyclic, R-prominent, |
| Metrics | Lith size: 5->9µm;
Data source notes: original description & illustrated specimens |
The morphological data given here can be used on the advanced search page. See also these notes
Geological Range:
Last occurrence (top): within NJ12a subzone (165.55-166.40Ma, top in Callovian stage). Data source: Bown & Cooper 1998
First occurrence (base): at base of NJ8b subzone (0% up, 171.8Ma, in Aalenian stage). Data source: Bown & Cooper 1998 (fig 4) - zonal event;Mattioli & Erba 1999, fig. 12 (slightly later)
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
- (NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Watznaueria
References:
Bown, P. R. & Cooper, M. K. E. (1989b). New calcareous nannofssils from the Jurassic. Journal of Micropalaeontology. 8: 91-96. gs V O
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
Bown, P. R., Cooper, M. K. E. & Lord, A. R. (1988). A calcareous nannofossil biozonation scheme for the early to mid Mesozoic. Newsletters on Stratigraphy. 20: 91-114. gs
Cobianchi, M., Erba, E. & Pirini-Radrizzani, C. (1992). Evolutionary trends of calcareous nannofossil genera Lotharingius and Watznaueria during the Early and Middle Jurassic. Memorie di Scienze Geologiche. 43: 19-25. gs V O
Mattioli, E. & Erba, E. (1999). Synthesis of calcareous nannofossil events in Tethyan lower and middle Jurassic successions. Rivista Italiana di Paleontologia e Stratigrafia. 105(3): 343-376. gs V O
Mattioli, E. (1996). New calcareous nannofossil species from the Early Jurassic of Tethys. Rivista Italiana di Paleontologia e Stratigrafia. 102(3): 397-412. gs V O
