Cretarhabdus


Classification: Mesozoic -> Podorhabdales -> Cretarhabdaceae -> Cretarhabdus
Sister taxa: Cretarhabdus, Cruciellipsis, Flabellites, Grantarhabdus, Helenea, Mattiolia, Miravetesina, Pickelhaube, Retecapsa, Speetonia,

Distinguishing features: Cretarhabdids with central area net that often includes axial cross bars.


Daughter taxa: (blue => in age window 0-300Ma)
Cretarhabdid coccoliths with a distinct central area axial cross and net.
Small Cretarhabdus with an irregular central grill. The bars of the grill are distinctly birefringent in XPL.
Medium to large retecapsids with relatively wide central area and multiple lateral bars (~4 in each quadrant).
Medium to large Cretarhabdus with distinctive wide central net that includes narrow axial cross bars and multiple narrow lateral bars. The bars of the net are birefringent.
Specimens not identified to species level

Taxonomy:

Citation: Cretarhabdus Bramlette & Martini, 1964
Rank: Genus
Type species: Cretarhabdus conicus Bramlette and Martini, 1964.
Synonyms:
Notes & discussion: Cretarhabdus is separated from Retecapsa on the grounds of having a fine net rather than relatively few cross-bars. This is subjective and arguably not very satisfactory, but it is widely used.

Farinacci & Howe catalog pages: Allemanites * Cretarhabdella * Cretarhabdus + + * Polypodorhabdus * Stradneria *

Distinguishing features: Cretarhabdids with central area net that often includes axial cross bars.

Geological Range:
Last occurrence (top): within Maastrichtian Stage (66.04-72.05Ma, top in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): within Oxfordian Stage (157.25-163.47Ma, base in Oxfordian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Black, M., (1971). Coccoliths of the Speeton Clay and Sutterby Marl. Proceedings of the Yorkshire Geological Society, 38: 381-424.

Bown, P.R. & Cooper, M.K.E., (1998). Jurassic. In: Bown, P.R. (Editor), Calcareous nannofossil biostratigraphy. British Micropalaeontological Society Publication Series. Chapman & Hall, pp. 34-85.

Bramlette, M.N. & Martini, E., (1964). The great change in calcareous nannoplankton fossils between the Maestrichtian and Danian. Micropaleontology, 10(2): 291-322.

Burnett, J.A., (1998). Upper Cretaceous. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 132-199.

GrĂ¼n, W. & Allemann, F., (1975). The Lower Cretaceous of Caravaca (Spain): Berriasian Calcareous Nannoplankton of the Miravetes Section (Subbetic Zone, Prov. of Murcia). Eclogae Geologicae Helvetiae, 68: 147-211.

Young, J.R. & Bown, P.R., (2014). Some emendments to calcareous nannoplankton taxonomy. Journal of Nannoplankton Research, 33(1): 39-46.


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

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