Aliculosphaera


Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed -> Aliculosphaera
Sister taxa: Aliculosphaera, Biantholithus, Camuralithus, Centumgemina, Ellipsolithus, Gladiolithus, Ilselithina, Leesella, Pedinocyclus, Petasus

Daughter taxa (time control age-window is: 0-800Ma)
Aliculosphaera subantarctica
large species with prominent wing

Taxonomy:

Citation: Aliculosphaera Aubry & Bord 2009
Rank: Genus
Type species: Helicosphaera? subantarctica Edwards and Perch-Nielsen 1975
Taxonomic discussion: The one known species does not conform to any well-establsihed genus so use of a separate genus for it as propsed by Aubry & Bord (2009) is justified.

Distinguishing features: Placolith with strongly distal shield, showing high birefringence

Farinacci & Howe catalog pages: Aliculosphaera *


Morphology: The one speices assigned to this genus was originally placed in Helicopontosphaera (a synonym of Helicosphaera) but it does not show the asymmetric flange of Helicosphaera and the distal shield is formed of R-units not V-units, as indicated by the high birefrinfegence seen in the type images. 


Ecology & Biogeography: Only recorded from the southern southwest Pacific.

Search data:
TagsLITHS: placolith, asymmetric, elliptical, CA: vacant, CROSS-POLARS: rim-unicyclic, R-prominent,
MetricsLith size: 10->15µm;
Data source notes: lith size from my obs [JRY unpubl]
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 Rupelian Stage (100% up, 28.1Ma, in Rupelian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Rupelian Stage (0% up, 33.9Ma, in Rupelian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

Aubry, M. -P. & Bord, D. (2009). Reshuffling the cards in the photic zone at the Eocene/Oligocene boundary. In, Koeberl, C. & Montanari, A. (eds) The Late Eocene Earth—Hothouse, Icehouse, and Impacts. Geological Society of America, Special Papers. 452: 279-301. gs


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Aliculosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-2-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=24 Go to Archive.is to create a permanent copy of this page - citation notes



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