Diadorhombus


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Diadorhombus
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: Square-shaped loxolith cococoliths with cross bars that run parallel to the coccolith sides.


Daughter taxa: (blue => in age window 0-800Ma)
Square-shaped loxolith cococoliths with cross bars that run parallel to the coccolith sides.
Specimens not identified to species level

Taxonomy:

Citation: Diadorhombus Worsley, 1971
Rank: Genus
Type species: Diadorhombus rectus Worsley, 1971.

Farinacci & Howe catalog pages: Diadorhombus + *

Distinguishing features: Square-shaped loxolith cococoliths with cross bars that run parallel to the coccolith sides.


Morphology remarks: The type species, D. rectus, has a square-shaped loxolith rim but is probably not closely related to similarly-shaped Stephanolithiaceae coccoliths, which have previously been included in the genus.

Geological Range:
Last occurrence (top): at top of Aptian Stage (100% up, 113Ma, in Aptian stage). Data source: Total of range of species in this database
First occurrence (base): in upper part of Berriasian Stage (55% up, 141.9Ma, in Berriasian 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

Worsley, T. R. (1971). Calcareous nannofossil zonation of Upper Jurassic and Lower Cretaceous sediments from the Western Atlantic. In, Farinacci, A. (ed.) Proceedings of the Second Planktonic Conference Roma 1971. Edizioni Tecnoscienza, Rome 2: 1301-1321. gs


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Diadorhombus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-10-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10368 Go to Archive.is to create a permanent copy of this page - citation notes



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