Nannotax3 - ntax_cenozoic - Aliculosphaera Nannotax3 - ntax_cenozoic - Aliculosphaera


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

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


Citation: Aliculosphaera Aubry & Bord 2009
taxonomic 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:
Parent taxon (Coccolith genera inc sed): Heterococcolith genera which cannot be assigned to any family
This taxon: Placolith with strongly distal shield, showing high birefringence

Farinacci & Howe catalog pages: Aliculosphaera *


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:
LITHS: placolith, asymmetric, elliptical, CA: vacant, CROSS-POLARS: rim-unicyclic, R-prominent,
Lith 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 Early Oligocene Sub-Epoch (100% up, 28.1Ma, in Rupelian stage). Data source: Total of ranges of the species in this database
First occurrence (base): within Early Oligocene Sub-Epoch (28.09-33.89Ma, base in Rupelian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:


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


Aliculosphaera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 6-12-2023

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