Distinguishing features:
Parent taxon (Tubodiscaceae): Elliptical placoliths composed of two narrow shields and a third, narrow, proximally-situated collar cycle that is variable in height. The central-area is broad and open; no central structures have yet been observed. The LM image is dark, although the collar cycle is brighter.
This taxon: Tubodiscids with low proximal collar cycle and wide central-area.
Daughter taxa (time control age-window is: 0-800Ma) | ||||
Manivitella fibrosa | ||||
Manivitella pemmatoidea Large to very large (8-15 µm) coccoliths with narrow rim and wide, vacant central area. The rim is bicyclic in XPL and the outer edge of the brighter inner cycle is distinctly beaded. | ||||
Manivitella sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Manivitella + *
Distinguishing features:
Parent taxon (Tubodiscaceae): Elliptical placoliths composed of two narrow shields and a third, narrow, proximally-situated collar cycle that is variable in height. The central-area is broad and open; no central structures have yet been observed. The LM image is dark, although the collar cycle is brighter.
This taxon: Tubodiscids with low proximal collar cycle and wide central-area.
Search data:
LITHS: placolith, elliptical, CA: vacant, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic, |
Lith size: 8->16µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Late Tithonian Substage (143.10-145.00Ma, base in Tithonian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Lower Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 86-131. gs O Manivit, H. (1965). Nannofossiles calcaires de L'Albo-Aptien. Revue de Micropaléontologie. 8: 189-201. gs Thierstein, H. R. (1971). Tentative Lower Cretaceous Calcareous Nannoplankton Zonation. Eclogae Geologicae Helvetiae. 64: 459-488. gs OReferences:
Manivitella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10627 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments