Taxonomy:
Distinguishing features:
Parent taxon (Alisphaera): Coccoliths placolith-like, with asymmetrical distal flange
This taxon: Flange extended into pointed wing. In oblique and side views it can be seen that the wing flares upwards and ends in sub-vertical wall. Teeth absent.
Farinacci & Howe catalog pages: A. extenta *
Size:
LITHS: placolith, asymmetric, elliptical, CA: ca_conjunct, plate, vacant, CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, R-prominent, |
Lith size: 1->2.5µm; Coccosphere size: 7->9µm; Liths per sphere: 70->90 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 |
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:
Cros, L. & Fortuño, J. -M. (2002). Atlas of northwestern Mediterranean coccolithophores. Scientia Marina. 66: 1-186. gs Giraudeau, J. & Bailey, G. W. (1995). Spatial dynamics of coccolithophore communities during an upwelling event in the Southern Benguela system. Continental Shelf Research. 15(1825-1852): -. 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 Meier, K. J. S., Kinkel, H. & Young, J. R. (2014). A note on calcareous nannoplankton from the Kieler Förde (Baltic Sea). Journal of Nannoplankton Research. 33(1): 29-37. 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 References:
Alisphaera extenta compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 11-10-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=28 Go to Archive.is to create a permanent copy of this page - citation notes |
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