Papposphaera heldalii Thomsen & Egge 2016, sp. nov. ...
Papposphaera heldalii sp. nov. Description of the heterococcolithophore phase: Coccosphere outer diameter ca. 10 µm; inner diameter 4 – 5 µm (Figs 3–5). Dimorphic coccoliths. Body coccoliths are narrowly elliptical and typically measure 0.9 – 1.0 × 0.5 – 0.6 µm. The coccolith rim (Fig. 2) is formed...
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| Format: | Text |
| Language: | unknown |
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Zenodo
2016
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| Online Access: | https://dx.doi.org/10.5281/zenodo.12531666 https://zenodo.org/doi/10.5281/zenodo.12531666 |
| Summary: | Papposphaera heldalii sp. nov. Description of the heterococcolithophore phase: Coccosphere outer diameter ca. 10 µm; inner diameter 4 – 5 µm (Figs 3–5). Dimorphic coccoliths. Body coccoliths are narrowly elliptical and typically measure 0.9 – 1.0 × 0.5 – 0.6 µm. The coccolith rim (Fig. 2) is formed by two cycles of elements. A proximal cycle of rod-shaped elements (0.1 – 0.2 × 0.04 µm) and a distal cycle of pentagonal elements that give the rim a regular serrated appearance. Elements from the distal cycle are regularly shifted half the length of a rod-shaped element from the proximal cycle and an extension from the pentagonal elements separates the rod-like elements (Figs 2, 7; arrows). The coccolith rim flares slightly relative to the subtending organic base plate, and is variable in height (0.2 – 0.3 µm). There is no central area calcification. Clusters of coccoliths with calicate central spines occur at the apical and antapical poles of the cell (Figs 3 – 5). These coccoliths are narrowly elliptical and ... : Published as part of Thomsen, Helge Abildhauge & Egge, Jorun Karin, 2016, Papposphaera heldalii sp. nov. (Haptophyta, Papposphaeraceae) from Svalbard, pp. 27-32 in Acta Protozoologica 55 (1) on page 29, DOI: 10.4467/16890027AP.16.004.4045, http://zenodo.org/record/10994310 ... |
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