Daughter taxa (time control age-window is: 0-800Ma) | ||||
Calcidiscus leptoporus subsp. quadriperforatus HOL Internal walls define 4-6 pores. Tube 10-15 crystallites high, castellated, higher where it meets internal walls. Tube sometimes double-layered, base open. | ||||
Scyphosphaera apsteinii HOL Liths similar to quadriperforatus but larger (3-4 µm), with more pores (8-20) and lacking castellations; single irregular boss near centre of lith. | ||||
Pontosphaera japonica HOL Solid, disk-shaped coccolith with several irregular deep depressions; formed of single block of crystalites with sub-vertical c-axes; no outer wall/tube; one or two irregular knobs on long axis. | ||||
Syracolithus sp. type A Coccoliths with area inside tube almost filled by concentric walls, distal surface ornamented by 10-15 pyramidal bosses. | ||||
Syracolithus sp. type B Liths similar to S. quadriperforatus but more delicate and with open hexagonal mesh fabric. | ||||
Syracolithus bicorium Liths similar to S. quadriperforatus but walls double layered with open hexagonal mesh fabric. |
Taxonomy:
Distinguishing features:
Parent taxon (Holococcoliths): Haploid life-cycle stages, with liths formed of numerous rhombohedral microcrystals
This taxon: Holococcoliths with tube, open distally and subdivided internally by vertical septae
Farinacci & Howe catalog pages: septate [no catalog entry yet]
Morphology:
This is a distinctive ultrastructure and although most species have been placed in Syracolithus it is quite different to the other species tradtionally placed in Syracolithus.
Biology & life-cycles
Phylogenetic relations
See also: Syracosphaera mediterranea HOl marisrubri type - apparently very similar morphology;
Search data:: hollow, |
Lith size: 1.8->4µm; |
Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Eocene Epoch (33.89-55.96Ma, base in Ypresian stage). Data source: Total of ranges of species in this database
Plot of occurrence data:
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:
septate compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 3-11-2024
Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1249 Go to Archive.is to create a permanent copy of this page - citation notes |
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