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  1. 1 Acta Protozoologica

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  1. 1 2015

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  1. 1 Thomsen H. A.

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in the keywords:  Coccolithophorid, holococcolith, Trigonaspis, polar regions, electron microscopy
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Coccolithophorids in Polar Waters: Trigonaspis spp. Revisited

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Thomsen H. A.
Acta Protozoologica
|
2015
|
vol. 54
|
issue 2
PL
A group of weakly calcified coccolithophorid genera and species were described from polar regions several decades ago. In the interim period a few additional findings have been reported adding to the morphological and biogeographical databases of some of the species. The holococcolithophorid genus Trigonaspis is revisited here with the purpose of providing, based on additional sampling from both polar regions, an update on species morphology, life history aspects and biogeography. The genus Trigonaspis as currently circumscribed comprises four taxa – two from each polar region. The triangular plates of crystallites that cover the surfaces of both the tower-shaped flagellar pole coccoliths and the disc-shaped body coccoliths are the keystone features of the genus. Circumstantial evidence exists linking species of Trigonaspis with species of Pappomonas in haploid-diploid life cycles.
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