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This brown and stripes chitinized structure is called the "strigil" and in Sigara and many other genera it is placed at the right hand side. In Corixa it is on the left. The strigil is only present in males. The size of it is also diagnostic, in Sigara striata and only a few other species of another genus, it is large, in many other species is it smaller, usually rounded, In only one european species (not in NL) the males strigil is absent.