2b. Dorsum lacking dark transversal bars; body depth at dorsal-fin origin 18.4–26.7, mean 22.2% of SL in P. varii, and 18.1–22.4,
mean 19.5 of SL in P. gracilis; cranial fontanel opened along its entire length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3a. Body with dark spots on the center of each body scale, forming conspicuous, straight dark lines; three branchiostegal rays;
angle of dorsal and ventralmost radii of body scales between 40° and 90° . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .Pseudanos varii sp.n. (Rio Negro basin, Río Casiquiare and Río Atabapo, upper Río Orinoco basin; Fig. 4).
3b. Body with dark pigmentation on upper and lower portion of scales forming faint, straight to wavy longitudinal lines, but lacking
pigmentation on the center of body scales; four branchiostegal rays; angle of dorsal and ventralmost radii of body scales
between 110° and 180° .... Pseudanos gracilis (central Amazon basin, including Rio Negro, Rio Branco, Rio Uatumã and Rio
Madeira basins; Fig. 7).