Aliculosphaera subantarctica


Classification: ntax_cenozoic -> Coccolith families inc sed -> Coccolith genera inc sed -> Aliculosphaera -> Aliculosphaera subantarctica
Sister taxa: A. subantarctica

Taxonomy:

Citation: Aliculosphaera subantarctica (Edwards & Perch-Nielsen 1975) Aubry & Bord 2009
Rank: Species
Basionym: Helicopontosphaera subantarctica Edwards & Perch-Nielsen 1975
Taxonomic discussion: The general morphology resembles Alisphaera but the strongly birefringent distal shield (see LMs) suggests this is an R-unit whereas it is a V-unit in Alisphaera. Edwards & Perch-Nielsen (1975) and Aubry & Bord (2009) both suggested affinity with the Zygodiscales - however this would again suggest that the flange would be formed of V-units.  An alternative possiblity is that this is an asymmetric reticulofenestrid.

Distinguishing features: large species with prominent wing

Farinacci & Howe catalog pages: H. subantarctica *

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): within Early Oligocene Sub-Epoch (28.09-33.89Ma, top in Rupelian stage). Data source: original description
First occurrence (base): within Early Oligocene Sub-Epoch (28.09-33.89Ma, base in Rupelian stage). Data source: original description

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

Edwards, A. R. & Perch-Nielsen, K. (1975). Calcareous nannofossils from the southern Southwest Pacific, Deep Sea Drilling Project, Leg 29. Initial Reports of the Deep Sea Drilling Project. 29: 469-539. gs V O


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Aliculosphaera subantarctica compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=25 Go to Archive.is to create a permanent copy of this page - citation notes



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