Ahmuellerella


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

Distinguishing features: Muroliths with complex axial cross structure or plate, typically incorporating 8 near-axial or radial bars or suture lines.


Daughter taxa (time control age-window is: 0-800Ma)
Ahmuellerella alboradiata
Medium-sized murolith coccoliths with a narrow unicyclic rim and a central-area plate characterised by eight radial segments of alternating bright and dark birefringence, divided by axial and diagonal sutures.
Ahmuellerella frankiae

Ahmuellerella octoradiata
Muroliths with narrow rim and central area plate-like structure incorporating 8 near-axial bars.
Ahmuellerella regularis
Muroliths with narrow rim and central area plate-like structure divided into 8 near-radial sectors each with a medial dark suture in LM.
Ahmuellerella sp.
Specimens not identified to species level

Taxonomy:

Citation: Ahmuellerella Reinhardt, 1964
Rank: Genus
Type species: Ahmuellerella limbitenuis Reinhardt (1964)
Synonyms: Actinozygus Gartner 1968

Farinacci & Howe catalog pages: Ahmuellerella + * , Actinozygus *

Distinguishing features: Muroliths with complex axial cross structure or plate, typically incorporating 8 near-axial or radial bars or suture lines.

Search data:
TagsLITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, plate, process, closed, CROSS-POLARS: rim-unicyclic, V-prominent,
MetricsLith size: 6->9µm;
Data source notes: size range of included species
The morphological data given here can be used on the advanced search page. See also these notes

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 top of Cenomanian Stage (97% up, 94.1Ma, in Cenomanian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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

Gartner, S. (1968). Coccoliths and related calcareous nannofossils from Upper Cretaceous deposits of Texas and Arkansas. University of Kansas Paleontological Contributions, Articles. 48 (Protista 1): 1-56. gs V O

Reinhardt, P. (1964). Einige Kalkflagellaten-Gattungen (Coccolithophoriden, Coccolithineen) aus dem Mesozoikum Deutschlands. Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin. 6: 749-759. gs V O


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Ahmuellerella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-5-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=10008 Go to Archive.is to create a permanent copy of this page - citation notes



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