Nannotax3 - ntax_cenozoic - Pappomonas weddellensis Nannotax3 - ntax_cenozoic - Pappomonas weddellensis

Pappomonas weddellensis


Classification: ntax_cenozoic -> Coccolith families inc sed -> Papposphaeraceae -> Pappomonas -> Pappomonas weddellensis
Sister taxa: P. borealis, P. flabellifera, P. garrisonii, P. weddellensis ⟩⟨ P. sp. type 1, P. sp. type 4, P. sp. type 5 ⟩⟨ P. sp.

Taxonomy:

Citation: Pappomonas weddellensis Thomsen in Thomsen et al., 1988
taxonomic rank: Species

Distinguishing features:
Parent taxon (Pappomonas): Coccolith distal rim serrated - elements pentagonal;
Coccosphere dimorphic or trimorphic. Processes only on CFCs coccoliths. Calices with 2-fold symmetry
BCs without axial spine or node

This taxon: CFC process ca. 2.0-2.5 µm high, with short stem supporting two large fan-like blades, one markedly larger than the other.
BCs with axial cross +/- extra bars
AACs like CFCs but much smaller spine and calyx

Farinacci & Howe catalog pages: P. weddellensis *


Morphology:

CFC process ca. 2.0-2.5 µm high, with short stem supporting two large fan-like blades, one markedly larger than the other.
AACs have much reduced symmetrical central processes without a shaft and smaller distal appendages and may have baseplate calcification of 8 radial bars instead of 4.

Size:
Cells 5-6 µm; BCs 1-1.5 µm long;


Ecology & Biogeography

Only known form the Southern Ocean (Thomsen & Ostergaard 2014)

Biology & life-cycles
"Combination cells involving P. weddellensis and Trigonaspis sp. have not yet been encountered. Trigonaspis melvillea Thomsen 1988 is abundant in Antarctic waters and might thus be a possible candidate." [Thomsen & Ostergaard 2014]

Search data:
LITHS: murolith, elliptical, CA: cross-axial, ca_disjunct, process,
CSPH: equant, CFC,
Lith size: 1->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. & Ostergaard, J. B. (2014). Coccolithophorids in polar waters: Pappomonas spp. revisited. Acta Protozoologica. 53: 235-256. 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

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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Pappomonas weddellensis compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 22-2-2024

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Short stable page link: https://mikrotax.org/Nannotax3/index.php?id=1002 Go to Archive.is to create a permanent copy of this page - citation notes
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