Rhabdophidites


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Rhabdophidites
Sister taxa: Amphizygus, Archaeozygodiscus, Gorkaea, Placozygus, Reinhardtites, Tranolithus, Zeugrhabdotus, Staurolithites, Diadorhombus, Rhabdophidites, Ahmuellerella, Bukrylithus, Heteromarginatus, Misceomarginatus, Monomarginatus, Neocrepidolithus, Vacherauvillius, Chiastozygus, Braloweria, Clepsilithus, Crepidolithus, Loxolithus, Tubirhabdus,

Distinguishing features:

Spinose forms with minute basal loxolith coccolith with axial cross bars. The spines are long, parallel sided (?or tapering) and cruciform in section.


Daughter taxa: (blue => in age window 0-800Ma)

Spinose forms with minute basal loxolith coccolith with axial cross bars. The spines are long, parallel sided and cruciform in section.
Specimens not identified to species level

Taxonomy:

Citation: Rhabdophidites Manivit, 1971
Rank: Genus
Type species: Rhabdophidites moeslensis Manivit, 1971.
Synonyms:

Rhabdolekiskus Wind & Cepek 1979 (type species R. parallelus)

Notes & discussion:

These forms with very long spines and minute basal coccoliths have been variably classified in the genera Rhabdolekiskus, Rhabdolithus, Rhabdophidites, Pseudolithraphidites, and Vekshinella. Lithraphidites carniolenis can have similar, but even smaller, basal coccoliths and is likely to be related.

Farinacci & Howe catalog pages: Rhabdophidites + * , Rhabdolekiskus *

Distinguishing features:

Spinose forms with minute basal loxolith coccolith with axial cross bars. The spines are long, parallel sided (?or tapering) and cruciform in section.


Morphology remarks:

Rhabdophidites parallelus is the most commonly observed form. The type species, Rhabdophidites moeslensis, has a tapering spine and may be a Lithraphidites if so R. parallelus should probably revert to the genus Rhabdolekiskus

See also: Lithraphidites carniolensis - similar but spine tapering and basal coccolith smaller (often missing);

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): at base of Valanginian Stage (0% up, 139.4Ma, in Valanginian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bown, P. R., Rutledge, D. C., Crux, J. A. & Gallagher, L. T. (1998). Early Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 86-131. gs

Manivit, H. (1971). Nannofossiles calcaires du Crétacé francais (Aptien-Maestrichtien). Essai de Biozonation appuyée sur les stratotypes. PhD thesis, Université de Paris. -. gs

Wind, F. H. & Cepek, P. (1979). Lower Cretaceous calcareous nannoplankton from DSDP Hole 397A (northwest African Margin). Initial Reports of the Deep Sea Drilling Project. 47A: 221-235. gs


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Rhabdophidites compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 17-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11007 Go to Archive.is to create a permanent copy of this page - citation notes



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