Phylum: Charophyta Family: Desmidiaceae
Staurastrum avicula var. lunatum (Ralfs) Coesel & Meesters
Until recently known as Staurastrum lunatum. Common in circumneutral waters such as the plankton of lochs
References:
Coesel, P.F.M. & Meesters, K.J. (2013) European Flora of the Desmid Genera Staurastrum and Staurodesmus
John, D.M. & Williamson, D.B. (2009) A Practical Guide to the Desmids of the West of Ireland
Ralfs, J. (1848) The British Desmidieae