Neosilba angusta Galeano-Olaya & Canal

Diagnosis: Neosilba angusta belongs to pendula subgroup. Neosilba angusta has the epandrium less than two times longer than wide, surstylus with 9 prensisetae at each side, two of them located medially and separated from the other longitudinally and external 7 prensisetae, aedeagus smooth beyond the base of cerci, the C‑shape of the aedeagus with the same width than filament in lateral and ventral view , apex of the filament slightly S‑shape and slightly narrowed, paramere with a triangularshape internal lobe with some setulae. N. pendula, N. perezi, N. pseudopendula and N. spiculata differ by the apex of the filament of the aedeagus being swollen; N. nigrocaerulea differs by proximal lobes of the surstylus wide and beyond the epandrium, by the 9 external and longitudinally prensisetae, and by the gonopodite, uniformelly wide; N. laura differs by the small spiculae at base of the filament and 6 prensisetae at each side of the surstylus; N. pantanense differs by the spiculae at the apical third of the filament of the aedeagus and prensisetae at each side of the surstylus; N. cornuphallus and N. turgidiphallus differs by the filament of the aedeagus wider at the middle and number of prensisetae.