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Sorry to disturb with non-dipterology question, but during a month I didn't find any source of infirmation.
This Collembola is from Neanuridae (with semi-moon top of abdomen) live under tree bark.
Collembola males have to leave spermatophor in any siutable place, than female have to gather it.
What do you think the sabject (marked red line) is spermatophor or something else?