Papposphaera sagittifera, HOL

Thomsen, Helge A., Østergaard, Jette B. & Heldal, Mikal, 2016, Coccolithophores in Polar Waters: HOL Revisited Papposphaera sagittifera HET and, Acta Protozoologica 55 (1), pp. 33-50 : 42

publication ID

https://doi.org/ 10.4467/16890027AP.16.005.4046

DOI

https://doi.org/10.5281/zenodo.12534983

persistent identifier

https://treatment.plazi.org/id/03EB512E-FF93-FF8F-FFF4-7EB791AFB770

treatment provided by

Felipe

scientific name

Papposphaera sagittifera
status

 

P. sagittifera HOL ( Figs 23–26 View Figs 23–26 )

A selection of complete cells from West Greenland and the North East Water Polynya ( Figs 23–26 View Figs 23–26 ) are illustrated to show the general appearance of the cell with flagella and haptonema. Symmetrical tower-shaped holococcoliths, flaring at both ends (apple-core shaped), radiate from the entire cell surface. A monolayer of hexagonal plates of crystallites covers the entire surface of the holococcolith often united to form larger scale patterns (e.g. Fig. 26 View Figs 23–26 ). The similarity between cells illustrated here and those included as part of the type description ( Manton et al. 1976b) is fairly convincing, also when it comes to dimensions there is an overall agreement .

The coccosphere diameter is in our material ca. 12 µm, and the diameter of the cell ca. 6 µm. The tower-shaped holococcoliths vary in length from roughly 1.5 to 3.5 µm. The minimum width along the tower is 0.4–0.6 µm. Manton et al. (1976a) found that the plates of crystallites in the type material measured 0.15 µm across. When measuring 64 randomly selected individual plates from Fig. 26 View Figs 23–26 (mean value: 0.144 ± 0.018 µm / overall range: 0.09–0.17 µm) the result thus corroborates the observation by Manton et al. (1976b).

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