Taxonomy:
These may prove to intraspecific varaints or may be associated with other Alisphaera species.
Distinguishing features:
Parent taxon (Polycrater phase): Phase with quadrate, cup-like nannoliths
This taxon: Distal cup entire, smooth
Farinacci & Howe catalog pages: P. galapagensis *
Morphology:
Biology & life-cycles
See also: Alisphaera unicornis - alternate life-cycle phase;
Search data:LITHS: nannolith-radiate, quadrate, CA: ca_conjunct, closed, CSPH: equant, monomorphic, CROSS-POLARS: V-prominent, |
Lith size: 0.5->0.7µm; Segments: 4->4; Coccosphere size: 9->14µm; Liths per sphere: 600->1000 Data source notes: csph & lith length from Cros & Fortuño 2002 & illustrated specs |
Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton (Young et al. 2003)
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" 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 Manton, I. & Oates, K. (1980). Polycrater galapagensis gen. et sp. nov., a putative coccolithophorid from the Galapagos Islands with an unusual aragonitic periplast. British Phycological Journal. 15: 95-103. 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 Thomsen, H. A. & Buck, K. R. (1998). Nanoflagellates of East Pacific coastal Waters: Morphology, taxonomy, and biogeography of weakly calcified coccolithophorids (Prymnesiophyceae). Cryptogamie Algologie. 19: 29-48. 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 unicornis POL compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-9-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1060 Go to Archive.is to create a permanent copy of this page - citation notes |
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Comments (1)
Dr Jelena Godrijan micrograph.