Nannotax3 - ntax_cenozoic - Alisphaera unicornis Nannotax3 - ntax_cenozoic - Alisphaera unicornis

Alisphaera unicornis


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

Taxonomy:

Citation: Alisphaera unicornis Okada & McIntyre, 1977
taxonomic rank: Species
Taxonomic discussion: Historically this was the most commonly recorded species, but many records are probably of other species.

Distinguishing features:
Parent taxon (Alisphaera): Coccoliths placolith-like, with asymmetrical distal flange
This taxon: Most coccoliths with well-developed horn-like spine on left-side of the broad margin of the flange. Teeth absent.

Farinacci & Howe catalog pages: A. unicornis + *


Morphology:

Coccospheres typically monomorphic, i.e. all coccoliths with spines, but there may be a few without.

Size:
liths 2-3 µm

See also: Alisphaera unicornis POL - alternate life-cycle phase;

Search data:
LITHS: placolith, asymmetric, elliptical, CA: ca_conjunct, plate, vacant,
CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, R-prominent,
Lith size: 1.5->3.1µm; Coccosphere size: 10->16µm; Liths per sphere: 80->150
Data source notes: lith size from Kleijne et al. 2002 and slightly extended; csph size from illustrated specs; csph data from Cros & Fortuño 2003; lith numbers from Yang & Wei 2003, range of estimates
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: present in the plankton (Young et al. 2003)
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: [JRY rough estimate]

Plot of occurrence data:

References:

Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs

Kleijne, A., Jordan, R. W., Heimdal, B. R., Samtleben, C., Chamberlain, A. H. L. & Cros, L. (2002). Five new species of the coccolithophorid genus Alisphaera (Haptophyta) with notes on their distribution, coccolith structure and taxonomy. Phycologia. 40(6): 583-601. gs

Konno, S. & Jordan, R. W. (2006). Lagoon coccolithophorids from the Republic of Palau, NW Equatorial Pacific. Journal of Nannoplankton Research. 28(2): 95-110. gs O

Okada, H. & McIntyre, A. (1977). Modern coccolithophores of the Pacific and North Atlantic Oceans. Micropaleontology. 23(1): 1-55. gs

Steinmetz, J. C. (1991). Calcareous nannoplankton biocoenosis: sediment trap studies in the Equatorial Atlantic, Central Pacific, and Panama Basin. Woods Hole Oceanographic Institution Report. 1: 1-85. gs

Supraha, L., Ljubesic, Z. & Henderiks, J. (2018). Combination coccospheres from the Eastern Adriatic coast: New, verified and possible life-cycle associations. Marine Micropaleontology. 141: 23-30. gs

Yang, T. -N., Wei, K. & Wu, J. -T. (2012). Marine coccolithophores around Taiwan. Biodiversity Research Center, Academica Sinica, Taipei. 1-96. gs

Young, J. R., Geisen, M., Cros, L., Kleijne, A., Probert, I. & Ostergaard, J. B. (2003). A guide to extant coccolithophore taxonomy. Journal of Nannoplankton Research. S1: 1-132. gs


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Alisphaera unicornis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-4-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=35 Go to Archive.is to create a permanent copy of this page - citation notes
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