Nannotax3 - ntax_cenozoic - H. ampliaperta group Nannotax3 - ntax_cenozoic - H. ampliaperta group

H. ampliaperta group


Classification: ntax_cenozoic -> Zygodiscales -> Helicosphaeraceae -> Helicosphaera -> H. ampliaperta group
Sister taxa: H. carteri group, H. walbersdorfensis group, H. ampliaperta group, H. recta group, H. lophota group, H. sp.

Daughter taxa (time control age-window is: 0-800Ma)
Helicosphaera ampliaperta
Central-area open; wing merges into flange; blanket confined to central opening
Helicosphaera scissura
Like H. ampliaperta but with a narow slit-like opening in the central-area.
Helicosphaera magnifica
Large to medium sized, with closed central-area and wide wing which extends along most of length of helicolith.
Helicosphaera alata
Like H. magnifica but with open central area, and larger

Taxonomy:

Citation: H. ampliaperta group of Young (1998)
taxonomic rank: species group

Distinguishing features:
Parent taxon (Helicosphaera): Coccoliths with helical flange; arranged spirally on the coccosphere
This taxon: Early Miocene group of Helicosphaera species without a sinlge central opening, blanket confined to central area, variably developed wing.

Farinacci & Howe catalog pages:


Morphology:

Early Miocene group of Helicosphaera species without a sinlge central opening, blanket confined to central area, variably developed wing.

Search data:
Lith size: 7->15µm;
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 NN5 zone (100% up, 13.5Ma, in Serravallian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within NN2 zone (19.00-22.82Ma, base in Aquitanian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Young, J. R. (1998). Neogene. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265. gs


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H. ampliaperta group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 16-6-2024

Taxon Search:
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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=635 Go to Archive.is to create a permanent copy of this page - citation notes
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