Phylum: Charophyta   Family: Desmidiaceae

Cosmarium scutiforme Van Geest & Coesel 2019

First described by Van Geest & Coesel (2019, p. 126, figs. 7,18,24), as one of many crenate species, which can be confusingly similar. It would seem to occur predominantly in atmophytic habitats such as ephemeral pools and with moss on wet rocks.

References: 
Van Geest, A. & Coesel, P. (2019). Some new and interesting desmids (Streptophyta, Desmidiales) from ephemeral puddles in the urban and industrial areas of Amsterdam (Netherlands).
Kouwets, F.A.C. (in manuscript) European Flora of the Desmid Genus Cosmarium.