Nannotax3 - ntax_mesozoic

Nannotax3 - ntax_mesozoic - Ahmuellerella Nannotax3 - ntax_mesozoic - Ahmuellerella

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, C. - unidentified

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 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

Taxonomic rank: genus

Type species: Ahmuellerella limbitenuis Reinhardt (1964)

Synonyms: Actinozygus Gartner 1968

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

Search data:

LITHS: murolith, elliptical, CA: closed, cross-axial, plate, process, ca_disjunct, CROSS-POLARS: V-prominent, rim-unicyclic,

Lith 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 Danian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within UC5b subzone (93.98-94.21Ma, base in Cenomanian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Chiastozygaceae

References:

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