Distinguishing features:
Parent taxon (Chiastozygaceae): Typical Eiffelithales - rim with well outer/upper clockwise-imbricate V-units and lower/inner R-units. Central area open or spanned by disjunct cross or bar supporting a spine.
This taxon: 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 (time control age-window is: 0-800Ma) | ||||
Amphizygus brooksii Bicyclic muroliths with complex transverse bar, formed from laths which continue around the inner edge of the rim, delineating the two circular perforations. | ||||
Amphizygus microminutus Very small (<3 µm) murolith coccolith with transverse bar and spine | ||||
Amphizygus minimus Small Amphizygus. | ||||
Amphizygus sp. Specimens not identified to species level |
Taxonomy:
Farinacci & Howe catalog pages: Amphizygus * , Bipodorhabdus *
Distinguishing features:
Parent taxon (Chiastozygaceae): Typical Eiffelithales - rim with well outer/upper clockwise-imbricate V-units and lower/inner R-units. Central area open or spanned by disjunct cross or bar supporting a spine.
This taxon: Muroliths with bicyclic rim and tranverse bar formed from laths which continue around the inner edge of the rim, delineating the two circular perforations.
Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, bar, CROSS-POLARS: rim-bicyclic, V-prominent, |
Lith size: 4->9µm; Data source notes: size range of included species |
Geological Range:
Last occurrence (top): at top of Maastrichtian Stage (100% up, 66Ma, in Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Albian Stage (100.50-113.20Ma, base in Albian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
Bukry, D. (1969). Upper Cretaceous coccoliths from Texas and Europe. University of Kansas Paleontological Contributions, Articles. 51 (Protista 2): 1-79. gs O Burnett, J. A. (1998). Upper Cretaceous. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 132-199. gs OReferences:
Amphizygus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-9-2024
Short stable page link: https://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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