Nannotax3 - ntax_cenozoic - Pappomonas borealis

Citation: Pappomonas borealis (Manton, Sutherland&McCully 1976) Thomsen & Ostergaard 2014

Basionym: Pappomonas flabellifera var. borealis Manton, Sutherland and McCully 1976

Taxonomic discussion: Formerly regarded as a variety of P. flabellifera but elevated to species rank by Thomsen & Ostergaard (2014)

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: CFCs with axial cross, spine and flat calyx of two similar, triangular blades,
BCs 1-1.8 µm long, with 5-9 longitudinal bars
AACs like BCs but 1 or 2 rim elements extended into lateral spines

Process triangular with serrated end, described from Greenland. AACs may have extended rim elements but no process (JRY - unpubl obs / see images; also Thomsen & Ostergaard 2014)

Geological Range:
Last occurrence (top): Extant. Data source: present in the plankton
First occurrence (base): within No known fossil record modern (0.00-0.00Ma, base in "Holocene" stage). Data source: [JRY 2016]

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

Manton, I., Sutherland, J. & McCully, M. (1976). Fine structural observations on coccolithophorids from South Alaska in the genera Papposphaera Tangen and Pappomonas Manton and Oates. British Phycological Journal. 11: 225-234. gs

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

Thomsen, H. A. & Ostergaard, J. B. (2014). Coccolithophorids in polar waters: Pappomonas spp. revisited. Acta Protozoologica. 53: 235-256. gs

Thomsen, H. A. (2016). Baltic Sea coccolithophores – an overview of insights into their taxonomy and ecology from the last 40 years. Journal of Nannoplankton Research. 36(2): 97-119. gs O

Thomsen, H. A., Ostergaard, J. B. & Hansen, L. E. (1991). Heteromorphic life histories in Arctic coccolithophorids (Prymnesiophyceae). Journal of Phycology. 27: 634-642. 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

Pappomonas borealis

References:

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