Phylum: Dinoflagellata   Family: Ceratiaceae

Ceratium carolinianum (J.W. Bailey) L. Maggi 1880

First described and illustrated by Bailey (1851: 41, pl. 3: 4-5) as Peridinium carolinianum. It was later moved to its current position by Maggi (1880: 12). Widespread in moorland acidic pools and bogs.

References: 
Bailey, J.W. (1851) Microscopical observations made in South Carolina, Georgia and Florida.
Maggi, L. (1880) Tassonomia e corologia dei cilio-flagellati.
John, D.M., Whitton, B.A. & Brook, A.J. (2011 second edition) The Freshwater Algal Flora of the British Isles.