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Nannotax3 - ntax_mesozoic - Mitrolithus lenticularis Nannotax3 - ntax_mesozoic - Mitrolithus lenticularis

Mitrolithus lenticularis


Classification: ntax_mesozoic -> Stephanolithiales -> Parhabdolithaceae -> Mitrolithus -> Mitrolithus lenticularis
Sister taxa: M. elegans, M. lenticularis, M. sp.

Distinguishing features:
Parent taxon (Mitrolithus): Protolith coccoliths with high rim with broad proximal/inner rim cycle; central area filled by a massive boss/spine. Often seen in side view
This taxon: Mitrolithus with a spine that fits neatly into the rim forming a flush, domed upper surface.


Taxonomy:

Citation: Mitrolithus lenticularis Bown, 1987
Taxonomic rank: species

Farinacci & Howe catalog pages: M. lenticularis *

Distinguishing features:
Parent taxon (Mitrolithus): Protolith coccoliths with high rim with broad proximal/inner rim cycle; central area filled by a massive boss/spine. Often seen in side view
This taxon: Mitrolithus with a spine that fits neatly into the rim forming a flush, domed upper surface.


Morphology:

Typically smaller than M. elegans and the spine top is flush with the top of the rim.

Search data:
LITHS: murolith, elliptical, CA: process, ca_disjunct, CROSS-POLARS: R-prominent, V-prominent, rim-bicyclic,
Lith size: 4->6µm;
Data source notes: Bown 1987
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): in mid part of NJT7b subzone (50% up, 180.7Ma, in Toarcian stage). Data source: Mattioli & Erba 1999, fig. 12
First occurrence (base): at base of NJT3b subzone (0% up, 194.1Ma, in Sinemurian stage). Data source: Mattioli & Erba 1999 - zonal marker

Plot of occurrence data:

References:

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

Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs

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

Menini, A., Mattioli, E., Spangenberg, J. E., Pittet, B. & Suan, G. (2018). New calcareous nannofossil and carbon isotope data for the Pliensbachian/Toarcian boundary (Early Jurassic) in the western Tethys and their paleoenvironmental implications. Newsletters on Stratigraphy. -. gs

Sandoval, J. et al. (2012). The Toarcian in the Subbetic basin (southern Spain): bio-events (ammonite and calcareous nannofossils) and carbon-isotope stratigraphy. Palaeogeography Palaeoclimatology Palaeoecology. 342-3: 40-63. gs


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Mitrolithus lenticularis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-3-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10694 Go to Archive.is to create a permanent copy of this page - citation notes
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