Citation: Alisphaera pinnigera Kleijne et al., 2002taxonomic rank: SpeciesVariants:
Alisphaera uncinata Kleijne et al. 2002 - similar to A. pinnigera but protrusion hook-like and only present on a few (ca. 4) coccoliths.
Distinguishing features: Parent taxon (Alisphaera): Coccoliths placolith-like, with asymmetrical distal flange This taxon: Varimorphic, most coccoliths with no spine, a few with a sharp spike-like spine. Coccoliths also smaller and smoother than those of A. unicornis with narrower central area. Teeth variably developed
Morphology: Described as dimorphic by Kleijne et al. (2002) but there is not really a sharp dichotomy between coccoliths with and without protrusions since coccoliths with very weak protrusions also occur. So it probably would be better to describe them as varimorphic. [my interpretation - JRY 2023] Size: Liths 1.3-2 µm
Lith size: 1.2->1.8µm; Coccosphere size: 7->11µm; Liths per sphere: 70->250 Data source notes: lith size from Kleijne et al. 2002 and slightly extended; csph data from Cros & Fortuño 2003; lith numbers from Yang & Wei 2003, range inferred from single estimate
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 No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY rough estimate]
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
(NB There is no histogram as there are no occurrence records for the taxon in the Neptune database) Parent: Alisphaera
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
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
Alisphaera pinnigera compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 8-9-2024
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