Sub-taxa & variants (time control age-window is: 0-800Ma) | ||||
Calciarcus alaskensis morphotype 1 3–4 flexible struts, rising 0.2-0.4µm above base plate & ending in blunt spine | ||||
Calciarcus alaskensis morphotype 2 3 struts, rising ca. 0.15 µm above base plate & not ending in spine. | ||||
Calciarcus alaskensis morphotype 3 3–4 struts, rising 0.5-1.25 µm above base plate & ending in blunt spine. |
Taxonomy:
Distinguishing features:
Parent taxon (Calciarcus): Monomorphic. Rhombohedral crystallites forming 3 or 4 radial converging struts attached to a scale with calcareous rim
This taxon: Scales ca. 0.5 µm across, with 3 or 4 calcified struts forming a wigwam-like structure
Farinacci & Howe catalog pages: C. alaskensis *
Biology & life-cycles
LITHS: holococcolith, circular, CA: diagonal cross, CSPH: equant, monomorphic, |
Lith size: 0.5->0.7µm; Coccosphere size: 5->7µm; Data source notes: lith and csph size from illustrated specimens |
Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton
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:
Manton, I., Sutherland, J. & Oates, K. (1977). Arctic coccolithophorids: Wigwamma arctica gen. et sp. nov. from Greenland and Arctic Canada; W. annulifera sp. nov. from South Africa and S. Alaska and Calciarcus alaskensis gen. et sp. nov. from S. Alaska. Proceedings of the Royal Society of London. 197(1127): 145-168. gs Thomsen, H. A. & Ostergaard, J. B. (2014). Coccolithophorids in polar waters: Calciarcus spp. revisited. Acta Protozoologica. 53(145-157): -. gs Thomsen, H. A. (1981). Identification by electron microscopy of nanoplanktonic coccolithophorids (Prymnesiophyceae) from West Greenland, including the description of Papposphaera sarion sp. nov. British Phycological Journal. 16: 77-94. gs Thomsen, H. A., Buck, K. R., Coale, S. L., Garrison, D. L. & Gowing, M. M. (1988). Nanoplanktonic coccolithophorids (Prymnesiophyceae, Haptophyceae) from the Weddell Sea, Antarctica. Nordic Journal of Botany. 8: 419-436. gs Thomsen, H. A., Ostergaard, J. B. & Hansen, L. E. (1991). Heteromorphic life histories in Arctic coccolithophorids (Prymnesiophyceae). Journal of Phycology. 27: 634-642. gs Thomsen, H. A., Ostergaard, J. B. & Heldal, M. (2013). Coccolithophorids in polar waters: Wigwamma spp. revisited. Acta Protozoologica. 52: 237-256. gs OReferences:
Calciarcus alaskensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 15-12-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=172 Go to Archive.is to create a permanent copy of this page - citation notes |
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