Nannotax3 - ntax_mesozoic

Helicorhabdus

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

Distinguishing features: Circular with proximal shield wider than distal; spine with helical structure

Daughter taxa (time control age-window is: 0-800Ma)
				Helicorhabdus asymetricus Helicorhabdus species with well-developed spine topped by an asymmetric plate-like calyx
				Helicorhabdus sp. Specimens not identified to species level

Taxonomy:

Citation: Helicorhabdus Lambert, 1987

Rank: Genus

Type species: Helicorhabdus asymetricus Lambert, 1987

Farinacci & Howe catalog pages: Helicorhabdus *

Distinguishing features: Circular with proximal shield wider than distal; spine with helical structure

Phylogenetic relations: Lambert included the genus in heterococcoliths incertae sedis, however, the basal structure seems similar to that of the Biscutaceae apart from the different relative sizes of the shields.

Search data:

Tags	LITHS: placolith, circular, CA: process, closed, CROSS-POLARS: rim-unicyclic, V-prominent,
Metrics	Lith size: 1.5->2.5µm; 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 Albian Stage (100% up, 100.5Ma, in Albian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Albian Stage (43% up, 107.6Ma, in Albian 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:

Lambert, B. (1987). Nannofossiles calcaires de l'Albien supérieur et du Vraconnien du Cameroun méridional. Cahiers de Micropaléontologie. 2(2): 33-60. gs V O

Helicorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-4-2021

Taxon Search:

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10513 Go to Archive.is to create a permanent copy of this page - citation notes

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