Nannotax3 - ntax_cenozoic - Alisphaera bidentata Nannotax3 - ntax_cenozoic - Alisphaera bidentata

Alisphaera bidentata

Classification: ntax_cenozoic -> Coccolith families inc sed -> Alisphaeraceae -> Alisphaera -> Alisphaera bidentata
Sister taxa: A. capulata, A. memoria, A. ordinata, A. quadrilatera ⟩⟨ A. extenta, A. gaudii ⟩⟨ A. unicornis, A. spatula, A. bidentata, A. pinnigera, A. sp.


Citation: Alisphaera bidentata Malinverno, in Malinverno et al. 2022
taxonomic rank: species
Taxonomic discussion: The description was based on only two specimens and they show strong similarities to A. unicornis. However, the type of ornament shown by the specimens has not been seen previously on A. unicornis, so description of a new species seems justifiable.

Distinguishing features:
Parent taxon (Alisphaera): Coccoliths placolith-like, with asymmetrical distal flange
This taxon: Like A. spatula but varimorphic, many coccoliths lack the spine. Teeth well-developed, and large nodules and at the ends of the central area.

Farinacci & Howe catalog pages: A. bidentata [no catalog entry yet]

Search data:
Lith size: 1.3->2µm; Coccosphere size: 8->12µm;
Data source notes: original description, with some extension
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): Extant. Data source:
First occurrence (base): within no known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source:

Plot of occurrence data:


Malinverno, E., Leoni , B. & Galli, P. (2022). Coccolithophore assemblages and a new species of Alisphaera from the Faafu Atoll, Maldives, Indian Ocean. Marine Micropaleontology. 172(102110): 1-16. gs


Alisphaera bidentata compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2024

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Short stable page link: Go to to create a permanent copy of this page - citation notes

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