Ahmuellerella


Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Ahmuellerella
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 complex axial cross structure or plate, typically incorporating 8 near-axial or radial bars or suture lines.


Daughter taxa: (blue => in age window 0-800Ma)
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.
Muroliths with narrow rim and central area plate-like structure incorporating 8 near-axial bars.
Muroliths with narrow rim and central area plate-like structure divided into 8 near-radial sectors each with a medial dark suture in LM.
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.

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

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

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


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Ahmuellerella compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 12-12-2019

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Short stable page link: http://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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