Papposphaera heldalii sp. nov. (Haptophyta, Papposphaeraceae) from Svalbard

Helge Abildhauge Thomsen,

Jorun Karin Egge

Abstrakt
In an attempt to establish a taxonomy for the polar contingent of lightly calcified coccolithophores, we are currently dealing with species of Papposphaera. Here we describe a new species, Papposphaera heldalii sp. nov., based on material from Svalbard. The species is unique in terms of calyx design, which is an elegant modification of the standard P. sagittifera theme, and also in terms of the absence of central area calcification in body coccoliths. The species thus occupies a further step in a sequence of five Arctic forms ranging from P. sagittifera via P. sarion, P. arctica and P. iugifera to P. heldalii showing a gradual reduction of central area calcification in body coccoliths. P. heldalii is unique also in the sense that the species has not been found during any of the major Arctic TEM nanoplankton surveys conducted during the last decades. 
Słowa kluczowe: Papposphaera, P. heldalii sp. nov., Papposphaeraceae, Svalbard, scanning electron microscopy
References

Thomsen H. A., Buck K. R. (1998) Nanoflagellates of East Pacific coastal waters: Morphology, taxonomy, and biogeography of weakly calcified coccolithophores (Haptophyceae, Prymnesiophyceae). Cryptogamie, Algol19: 2948

Thomsen H. A., Østergaard J. B. (2014a) Cocolithophorids in polar waters: Pappomonas spp. revisited. Acta Protozool53: 235256

Thomsen H. A., Østergaard J. B. (2014b) Cocolithophorids in polar waters: Trigonaspis spp. revisited. Acta Protozool54: 8596

Thomsen H. A., Østergaard, J. B. (2016) Papposphaera iugifera nov. sp. from West Greenland, Svalbard, and the Baltic Sea. Rev. Micropaléontol. (in press)

Thomsen H. A., Heldal M., Østergaard J. B. (2016a) Coccolithophores in polar waters: Papposphaera arctica HET and HOL revisited. Micropaleontology Acta Protozool55: 33–50

Thomsen H. A., Heldal M., Østergaard J. B. (2016b) Coccolithophores in polar waters: Papposphaera sarion HET and HOL revisited. Micropaleontology (in press)

Young J. R., Bergen J. A., Bown P. R., Burnett J. A., Fiorentino A., Jordan R. W., Kleijne A., van Niel B. E., Romein A. J. T., von Salis K. (1997) Guidelines for coccolith and calcareous nannofossil terminology. Palaeontology 40: 875912

Young J., Geisen V., Cros L., Kleijne A., Sprengel C., Probert I., Østergaard J. (2003) A guide to extant coccolithophorid taxonomy. J. Nannopl. Res., Special Issue 1: 1132

Young J. R. Bown P. R., Lees J. A. (eds) Nannotax3 website. International Nannoplankton Association. 13 June 2015. URL: http://ina.tmsoc.org/Nannotax3/link.php?taxon=Papposphaera_lepida

Czasopismo w darmowym dostępie.

Czasopismo ukazuje się w sposób ciągły on-line.
Pierwotną formą czasopisma jest wersja elektroniczna.