I found this one in a sample from the Bert Bospad, the Netherlands. It came up in a wet mount kept in a moist chamber for some days. There was one specimen, attached to the underside of the coverslip. It had granules in its filopodia and showed moving and running plasmveils The granules are few in number, but distinct. It was impossible to detect the shape and structure of the pseudostome and the nucleus. The body is spherical.
Metaheleopera
M. ovalistoma – after Bartos, 1963 Metaheleopera Bartos, 1963 Diagnosis: Shell clearly narrowing towards the pseudostome, which can be seen even more clearly on the narrower sides