Nannotax3 - ntax_mesozoic - Gephyrobiscutum

Gephyrobiscutum

Classification: ntax_mesozoic -> Podorhabdales -> Biscutaceae -> Gephyrobiscutum
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 unicyclic rim; central-area spanned by oblique transverse bar with two distal spikes

Daughter taxa (time control age-window is: 0-800Ma)
				Gephyrobiscutum diabolum Elliptical, unicyclic; distal shield sculpted; central-area with oblique transverse bar and two spikes.
				Gephyrobiscutum sp. Specimens not identified to species level

Taxonomy:

Citation: Gephyrobiscutum Wise, 1988

Rank: Genus

Type species: Gephyrobiscutum diabolum Wise, 1988

Farinacci & Howe catalog pages: Gephyrobiscutum *

Morphology: Austral biogeographic distribution, but rarely reported.

Search data:

Tags	LITHS: placolith, elliptical, CA: ca_disjunct, process, bar, CROSS-POLARS: rim-unicyclic, V-prominent,
Metrics	Lith size: 3->4.5µm; 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 Campanian Stage (100% up, 72.1Ma, in Campanian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Campanian Stage (0% up, 83.6Ma, in Campanian 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:

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

Wise, S. W. (1988). Mesozoic-Cenozoic history of calcareous nannofossils in the region of the Southern Ocean. Palaeogeography Palaeoclimatology Palaeoecology. 67: 157-179. gs

Gephyrobiscutum compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-1-2022

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10472 Go to Archive.is to create a permanent copy of this page - citation notes

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