Citation: Papposphaera obpyramidalis Thomsen in Thomsen et al., 1988Taxonomic rank: species
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 1.5-2.5 µm high, low stem supports fan-shaped calyx of four large elements with rounded distal edges.
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 on 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 & BiogeographyDescribed 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.
Lith 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:
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: Papposphaera
References:
Findlay, C. S. & Giraudeau, J. (2000). Extant calcareous nannoplankton in the Australian sector of the Southern Ocean (austral summers 1994 and 1995). Marine Micropaleontology. 40(4): 417-439. 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., Egge, J. K. & Heldal, M. (2016). 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. S1: 1-132. gs
Papposphaera obpyramidalis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 25-1-2025
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Findlay & Giraudeau 2000 pl1 f5.JPG
Thomsen et al 2016 Pobpyram fig3-C.JPG
Thomsen et al 2016 Pobpyram fig2-D.JPG
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Thomsen et al 2016 Pobpyram fig3-A.JPG
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