Papposphaera obpyramidalis


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

Taxonomy:

Citation: Papposphaera obpyramidalis Thomsen in Thomsen et al., 1988
Rank: Species

Distinguishing features: Central areas with axial cross;
Process 1.5-2.5 µm high, low stem supports fan-shaped calyx of four large elements with rounded distal edges.

Farinacci & Howe catalog pages: P. obpyramidalis *


Morphology: Coccoliths are varimorphic - calyx size varies with the largest calices at the flagellar pole ( Thomsen et al. 2016).  Calices were thought to be conical shaped but Thomsen et al. (2016) showed that even undisturbed coccospheres (seen in LM) they are flattened and, so fan-shaped.
Thomsen et al. (2016) also show that small underlayer scales occur, which is unusual in Papposphaera and Pappomonas, although common in Wigwamma, Turrisphaera, Trigonaspis and Quaternariella.

Size: Cell spherical, ca. 5 µm. Coccoliths, ca. 1.5 µm long;


Ecology & Biogeography: Described from Weddell Sea and most records are from Antarctic but also observed in the Arctic (Thomsen et al. 2016). Cell lacks chloroplasts (like other Arctic Papposphaeraceae) and has prominent haptonema so presumably is heterotrophic.

Search data:
TagsLITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, process,
CSPH: equant, CFC, monomorphic,
MetricsLith size: 1.3->1.5µm;
Data source notes: lith size (BC diameter) from OD
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:

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., Egge, J. K. & Heldal, M. (2016b). Papposphaera obpyramidalis (Haptophyta, Papposphaeraceae): New findings from both Polar Regions. Revue de Micropaléontologie. 59: 267-273. 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, Special Issue. 1: 1-132. gs V O


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Papposphaera obpyramidalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 1-3-2021

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1013 Go to Archive.is to create a permanent copy of this page - citation notes



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