Nannotax3 - Mesozoic - Vacherauvillius

Vacherauvillius

Classification: Mesozoic -> Eiffellithales -> Chiastozygaceae -> Vacherauvillius
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 axial, lateral and concentric bars spanning the central-area.

Daughter taxa: (blue => in age window 0-800Ma)
				Vacherauvillius implicatus Very small (<3µm) muroliths with axial, lateral and concentric bars spanning the central-area.
				Vacherauvillius sp. Specimens not identified to species level

Taxonomy:

Citation: Vacherauvillius Goy in Goy et al., 1979

Rank: Genus

Type species: not designated

Variants:

Saeptella Goy 1979 - another genus of minute elliptical cocoliths with imbricate rims, but with axial cross and grill in central area. This range of variation in central area strucute would normally be included in one genus (see e,g, Papposphaera or Pappomonas) [my interpretation - JRY 2017]

Farinacci & Howe catalog pages: Vacherauvillius * , Saeptella *

Distinguishing features: Muroliths with axial, lateral and concentric bars spanning the central-area.

Search data:

Tags	murolith, elliptical, CA: concentric-ring(s), cross-axial, grill, process, DETAILS: ca_disjunct, rim-unicyclic,
Metrics	Lith size: 2->3µm; Data source notes: size range of included species Sources: 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 Toarcian Stage (100% up, 174.2Ma, in Toarcian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Toarcian Stage (0% up, 182.7Ma, in Toarcian stage). Data source: Total of range 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:

Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series. 34-85. gs

Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Documents des laboratories de géologie Lyon. 75: 33-57. gs

Vacherauvillius compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-9-2020

Taxon Search:

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Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=11292 Go to Archive.is to create a permanent copy of this page - citation notes

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