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Are the smaller pictures the same species? The hypopygium of the male in lateral view (https://ibb.co/5jPgX1G) looks very much like that of N. perplexus even the strange vertical "projection" of the gonopod on the ventral side is visible! (it doesn't work to copy yhe illustration from Richter 1988 (translation of older work 1969) Do you know the work by Tsacas 1968 on Neomochtherus?