Silba erecta has only 1 strong seta on the katepisternum,
an unusual feature in the genus but shared by three Asian fig-feeding
species: S. ishigaki, S. lashker and S. ischnopda. In external features S.
erecta is most similar to Silba ishigaki, but the key feature which clearly
separates these species is in the shape of the phallus. The phallus of S.
ishigaki is long and thin, serrated for most of its length and with only a
single basal process (MacGowan and Okamoto, 2013, Fig. 7) whilst in S.
erecta it is far more complex