Phylum: Charophyta   Family: Gonatozygaceae

Gonatozygon kinahanii (W. Archer) L. Rabenhorst 1868

First described and illustrated by Archer (1858: 250, pl. 21: 1-4) under his new genus Leptocystinema as L. kinahani. Later moved by Rabenhorst (1868: 156) to Gonatozygon. Long-parallel cells with bluntly rounded apices. They contain terminal vacuoles with a few crystals. The cell-wall is smooth. It can be confused with some species of Mougeotia.
Cell dimensions: L: 150-500 µm; B: 10-20 µm; L/B: 12-36.
Brook & Williamson (2010: 127) describe it as fairly widely distributed in loch and pond margins, in acidic and alkaline habitats.

References: 
Archer, W. (1858) Supplementary catalogue of Desmidiaceae found in the neighbourhood of Dublin with description and figures of a proposed new genus and of four new species.
Brook, A.J. & Williamson, D.B. (2010) A Monograph on some British Desmids.
Coesel, P.F.M. & Meesters, K.J. (2023 second edition) Desmids of the Lowlands.
Rabenhorst, L. (1868) Flora europaea algarum aquae dulcis et submarinae. Sectio III. Algae chlorophyllophyceas, melanophyceas et rhodophyceas complectens.
Ruzicka, J. (1977) Die Desmidiaceen Mitteleuropas, Volume 1, Part 1.