You might like to call all the large Phacus with a long tail just longicauda. But no. There is more to it. Ever since Ehrenberg described the species in 1831 there has been a wide variety of names for different taxa in this group. A group of Polish researchers recently wrote a nice paper about the Phacus longicauda complex. They described 8 different species, that all have a long tail.There is a nest of Euglenid-experts in Poland. We had the great pleasure to have one of the best ones to be our guest at the annual meeting of the Finnish Phytoplankton Association last spring in Jyväskylä - prof...
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