Neosilba distospinosa  

Neosilba distospinosa has 8‑10 distal and
ventral (4‑5 in each side) spine-like spiculae in the filament
of the aedeagus (Fig. 9C), distal dorsal and lateral
side of C‑shaped densely spiculated (Figs. 9A‑B,
D‑E), C‑shaped abruptly reduced at the base of the
filament (Figs. 9D, E), surstylus with 7 distal prensisetae
in right angle at each side (Fig. 9F). N. distospinosa
belongs to certa subgroup because of the size and shape
of the male genitalia, The C‑shape is thicker than the
filament and this one is long and thin. Species of the
glaberrima subgroup (N. batesi, N. bifida, N. glaberrima,
N. delvechioi, N. inesperata and N. pseudobifida)
differs by the spine-like lobe or two projected lobes
arising on convex surface of the C‑shape and by the
shape of the paramere (Figs. 10‑12); N. certa (Fig. 13)
and N. bella differs by the C‑shape is gradually thinner
at the base of filament; N. oaxacana (Fig. 14)
differs by the prensisetae of the surstylus and by the
filament of the aedeagus; the surstylus has two prensisetae
located near the medial longitudinal line at each
side and the other ones located in a external longitudinal
line, and the filament does not have any spicula;
N. pradoi differs by the spiculae in the filament of the
aedeagus being absent; N. paramerolatus differs by the
filament of the aedeagus without spiculae and 9 prensisetae
at each side of the surstylus