Orthoseira helvetica sp. nov. – a new diatom (Bacillariophyceae) from the Swiss Alps
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Date
2023Type
- Journal Article
ETH Bibliography
yes
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Abstract
This paper describes a new diatom species (Orthoseira helvetica sp. nov.) found in the Swiss Alps at an elevation over 2600 m a.s.l. The diatom was recorded at the Macun plateau, Swiss National Park, from samples of terrestrial and wet semi-terrestrial mosses near the stream splash zone. The diatom has a unique set of features and is easily recognized under light and scanning electron microscopy. The most distinctive feature is the presence of a prominent silica collar in a ‘rose flower’ shape rounding each carinoportulae and an additional silica collar on the areolae (first 3–4 rows) bordering the hyaline area. The valve diameter of O. helvetica sp. nov. is 7.5–26.5 µm and possesses 2–3 (usually 3) carinoportulae. Linking spines at the valve face/mantle junction are present, having a simple basis and being triangular in shape. Show more
Publication status
publishedExternal links
Journal / series
Diatom ResearchVolume
Pages / Article No.
Publisher
Taylor & FrancisSubject
Macun lakes; Swiss National Park; terrestrial diatoms; centric diatom; Mediophyceae; alpine environmentsOrganisational unit
03705 - Jokela, Jukka / Jokela, Jukka
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ETH Bibliography
yes
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