Helicorhabdus


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

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


Daughter taxa: (blue => in age window 0-300Ma)

Helicorhabdus species with well-developed spine topped by an asymetric plate-like calyx


Specimens not identified to species level

Taxonomy:

Citation: Helicorhabdus Lambert, 1987
Rank: Genus

Farinacci & Howe catalog pages: Helicorhabdus *

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


Evolution & Phylogeny: 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.

Geological Range:
Last occurrence (top): within Albian Stage (100.50-112.95Ma, top in Albian stage). Data source: Total of range of species in this database
First occurrence (base): within Albian Stage (100.50-112.95Ma, base in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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


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Helicorhabdus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 20-7-2018

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