your pictures shows Thuricola folliculata. This ciliate is easy to identify, because he lives in a lorica which can be closed with a flap (very clearly visible in the DIC images in the upper third of the lorica, pressing against the ciliate´s body) when the ciliate contracts.
It is not two species in a single lorica. What actually is pictured is one Thuricola folliculata specimen (the big one with the green symbiontic algae inside) plus about three of his so-called microconjugants. These will leave the lorica to swim to another Thuricola folliculata to undergo sexual reproduction (conjugation).