Phylum: Charophyta   Family: Desmidiacea

Euastrum neosinuosum O.V. Anissimova & M.D. Guiry 2021

First described by Lenormand ex Archer (1861: 729): this name is illegal according to the International Code of Nomenclature (ICN) so the current authors chose a new name.
Cell dimensions: L: 60-75 µm, B: 35-45 µm, Is: 8-15 µm; Th: 18-32 µm; L/B: 1.5-1.8.
West & West (1905: 21) describe it for Scotland as “General, but rare.” Found in slightly acidic habitats such as loch-margins, and boggy pools.

References: 
Anissimova, O.V. & Guiry, M.D. (2021). Taxonomic and nomenclatural notes on desmids I. Euastrum circulare Hassall ex Ralfs and Euastrum sinuosum Lenormand ex W. Archer (Zygnematophyceae, Desmidiaceae).
Lenormand, S.R. ex Archer, W. [in] Pritchard, A. (1861). A history of infusoria, including the Desmidiaceae and Diatomaceae, British and foreign.
Ruzicka, J. (1981). Die Desmidiaceen Mitteleuropas, Volume 1, Part 2.
Turland, N. (2019 second edition). The Code Decoded: a user's guide to the International Code of Nomenclature for algae, fungi, and plants.
West, W. & West, G.S. (1905). A Monograph of the British Desmidiaceae, Volume 2.