When preparing entomology labs for undergraduates, I studied cockroach hindgut endosymbionts extracted from excrements of Gromphadorhina portentosa. I found these very firm ‘cysts’ of ca. 0.5-1 mm long, with the thick transparent coverage. One ‘cyst’ has a special design (marked *). Do you have any idea what it could be?

Thanks.

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