Actinophryx has an amoeboid body and glassy silica shells. which phylum and class does it belong to

The answer is phylum Sarcodina and class Heliozoa.

Actionophryx belongs to the group of amoebas, in older classification known as phylum Sarcodina. It has a spherical body with axopodia (arms) so it is classified to the class Heliozoa. The body is surrounded by a glassy silica shell. It lives in freshwater, but some species are found in seas and oceans.