Nannotax3 - ntax_mesozoic - Jimenezberrocosoia

Nannotax3 - ntax_mesozoic - Jimenezberrocosoia Nannotax3 - ntax_mesozoic - Jimenezberrocosoia

Jimenezberrocosoia

Classification: ntax_mesozoic -> Podorhabdales -> Biscutaceae -> Jimenezberrocosoia
Sister taxa: Biscutum, Discorhabdus, Similiscutum ⟩⟨ Boletuvelum, Chiastella, Crucibiscutum, Gaarderella, Gephyrobiscutum, Helicorhabdus, Jimenezberrocosoia, Seribiscutum, Sollasites

Distinguishing features:
Parent taxon (Biscutaceae): Regular placoliths; rim broad, central area relatively narrow, with variable central structures.
The distal shield is formed from V-units and the proximal shield and tube cycle are formed from R-units.
This taxon: Elliptical with slits between shield elements and axial cross

Daughter taxa (time control age-window is: 0-800Ma)
				Jimenezberrocosoia birchiae Small to very small (<3µm), central area very narrow
				Jimenezberrocosoia bosunensis Medium sized (4-6µm) with narrow central area and birefringent cross. Short-axis crossbar brighter than long-axis crossbar.

Taxonomy:

Citation: Jimenezberrocosoia Lees & Bown 2016

Rank: Genus

Type species: Jimenezberrocosoia birchiae Lees & Bown 2016

Taxonomic discussion: This genus has central-area features similar to certain species of Sollasites Black, 1967, but is distinct from Sollasites because of the distinctive rim slits. [Lees & Bown 2016]

Farinacci & Howe catalog pages: Jimenezberrocosoia

Morphology:

Biscutacean placolith coccoliths with slits between the elements of the distal shield. The narrow to moderately wide, open, elliptical central-areas are spanned by distinct structures, comprising an axial cross and accessory bars. The proximal shield comprises a rim of elongated, widely-spaced elements radiating from the central tube-cycle. [Lees & Bown 2016]

Search data:

LITHS: placolith, elliptical, CA: concentric-ring(s), cross-axial, ca_disjunct, CROSS-POLARS: rim-bicyclic, V-prominent, R-prominent,

Lith size: 2->6µm;
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 Coniacian Stage (100% up, 86.3Ma, in Coniacian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Aptian Stage (25% up, 123Ma, in Aptian 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: Biscutaceae

References:

Lees, J. A. & Bown, P. R. (2016). New and intriguing calcareous nannofossils from the Turonian (Upper Cretaceous) of Tanzania. Journal of Nannoplankton Research. 36(1): 83-95. gs V O

Jimenezberrocosoia compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 31-3-2023

Taxon Search:

Advanced Search

AphiaID: not found
Short stables page link: https://mikrotax.org/Nannotax3/index.php?id=10535 Go to Archive.is to create a permanent copy of this page - citation notes

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