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Papposphaera thomsenii


Classification: ntax_cenozoic -> Coccolith families inc sed -> Papposphaeraceae -> Papposphaera -> Papposphaera thomsenii
Sister taxa: P. lepida, P. obpyramidalis, P. vexillata ⟩⟨ P. sp. type 1, P. sp. type 4, P. sp. type 5, P. sp. type 6, P. sp. type 2 ⟩⟨ P. sagittifera, P. sarion, P. arctica, P. iugifera, P. heldalii ⟩⟨ P. thomsenii, P. bourrellii, P. sp. type 3, P. sp. cf. type 3, P. sp. type 3 ⟩⟨ P. simplicissima ⟩⟨ P. sp.

Taxonomy:

Citation: Papposphaera thomsenii Norris, 1983
Taxonomic rank: species
Taxonomic discussion: The speciemn was described from a disintegrated partial coccosphere showing only tall-spined coccoliths. These most probably are CFCs and the species most probably corresponds to one of the three informal taxa widely used for this group (Papposphaera sp type 3,  Papposphaera sp. cf. type 3, Pappomonas sp type 3), but without the BCs it is not possible to determine which. Nonetheless this species was validly described and was the first member of this group to be described.

Distinguishing features:
Parent taxon (Papposphaera): Coccolith distal rim serrated - elements pentagonal;
Coccosphere varimorphic, or dimorphic. All coccoliths have spines but CFCs typically have longer spines and larger calices.
This taxon: Central areas with axial cross;
Process 5-6 µm high, tall stem supports narrow cone of four elements.

Original description: Cells comprised of styliform pappoliths, all having approximately the same structure. Coccolith processes are up to approximately 6 p.m long. 5 p.m being the length of the hollow process shaft and 1 p.m being the upright distal elements. The 4 distal elements on the process are cuneiform [= wedge-shaped - JRY] with rounded disttal edges, together forming an infundibuliform [= cone-shaped - JRY] appendage. Coccolith basal disc circular in outline, having a rim of 16 upright, chevron-shaped elements. A row of low, small, triangular to rectangular elements lies at the base of these elements, the obtuse angle at the suture between the upright elements. Central area mostly open but crossed by four rows of rectangular elements that form a buttress at the base of the process. Entire coccospheres and living cells were not observed. Collected within the gut of a salp, surface sample, Station 132D (I.I.O.E., Anton Bruun).

Farinacci & Howe catalog pages: P. thomsenii *


Size:
Coccoliths 1.5-2 µm long;

Search data:
LITHS: murolith, elliptical, CA: ca_disjunct, cross-axial, process,
CSPH: equant, CFC,
Lith size: 1.5->2µm;
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:

References:

Norris, R. E. (1983). The family position of Papposphaera Tangen and Pappomonas Manton & Oates (Prymnesiophyceae) with records from the Indian Ocean. Phycologia. 22(2): 161-169. 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

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Papposphaera thomsenii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 23-1-2025

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1028 Go to Archive.is to create a permanent copy of this page - citation notes
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