Amphizygus


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Amphizygus
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: Muroliths with bicyclic rim and tranverse bar formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.


Daughter taxa: (blue => in age window 0-800Ma)
Muroliths with bicyclic rim and tranverse bar formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.
Small Amphizygus.
Specimens not identified to species level

Taxonomy:

Citation: Amphizygus Bukry, 1969
Rank: Genus
Type species: Amphizygus brooksii Bukry, 1969
Synonyms: Bipodorhabdus Noël 1970 (B. tesselatus the type of Bipodorhabdus is a junior synonym of A. brooksii the type of Amphizygus)

Farinacci & Howe catalog pages: Amphizygus * , Bipodorhabdus *

Distinguishing features: Muroliths with bicyclic rim and tranverse bar formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.

Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Maastrichtian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Albian Stage (0% up, 113Ma, in Albian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. The University of Kansas Paleontological Contributions. Article 51 (Protista 2): 1-79. gs

Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 132-199. gs


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Amphizygus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-9-2019

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=10013 Go to Archive.is to create a permanent copy of this page - citation notes



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