I was looking at a sediment sample from a "biosphere" that I´m creating and I came accross this little guy. I´m almost certain that it´s a freshwater diatom but would like to know the specific species, does anyone out there can recognize it? I would like to use the name properly when talking about the link between the past (diatomaceous earth) and the living diatoms that I´m finding here, to people who visit our museum at the Servicio Geológico Colombiano (Medellín). See video attached.