Giemsa stain
An important defining characteristic of the genus "Schellackia" is its octonucleate oocyst stage within the small intestine of a primary host – a combination of the presence of such oocysts as well as a lack of other parasites within the geographical area which share similar characteristics is sufficient to identify the genus. The oocysts are enclosed in a translucent wall which are partially impermeable to Giemsa stain, and the cells leave behind empty rounded spaces upon expiration.