Differential diagnosis: The epandrium with an obvious 9th tergite is apparently
unique amongst the described species of Silba. This tergite is evident in Lonchaea
species in the Lonchaea polyhamata McAlpine, 1964 species-group (MacGowan
2018) and all known Fulgenta species and may well represent a primitive condition
within the family. The row of three closely situated rounded prensisetae, the asymmetrical
pregonites with the left being very long and chitinised and the unique
serve to distinguish this species from other Silba species.