H. ampliaperta group


Classification: Coccolithophores -> 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: (blue => in age window 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)
Rank: species group

Distinguishing features: Early Miocene group of large Helicosphaera species with weak wing, and blanket confined to central area

Farinacci & Howe catalog pages:


Morphology: Early Miocene group of large Helicosphaera species with weak wing, and broad central area.

Search data:
TagsLITHS:
MetricsLith 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): in mid part of Langhian Stage (49% up, 14.9Ma, in Langhian stage). Data source: Total of range of species in this database
First occurrence (base): in lower part of Chattian Stage (25% up, 26.8Ma, in Chattian stage). Data source: Total of range 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 V O


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H. ampliaperta group compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-10-2020

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Short stable page link: http://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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