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are short, and the mouthparts unspecialised. Tricholepidion, Nicoletiidae and Protrinemuridae have eight pairs of short appendages called styli on their abdominal segments 2 to 9, but in Lepismatidae styli are only found on segment 7 to 9 or 8 to 9, and sometimes just on the ninth segment. Or styli can be completely absent. A distinctive feature of the group is the presence of three long, tail-like filaments extending from their last segment. These three generally subequal,

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