Tyttocharax metae

Males of T. metae reach an average standard length of 1.39 ± 0.13 cm (0.54 ± 0.05 in), while females reach a similar length of 1.4 ± 1.0 cm (0.55 ± 0.04 in), with a maximum standard length of approximately 1.86 cm (0.73 in).^[2]

It is colored a greenish-yellow in the dorsal sides of the head, body, and post-ventral portions of the body, with a blue stripe running down the side of the body, with a notable absence of dark coloration.^[2] T. metae lacks any distinction of coloration between sexes, unlike the related T. tambopatensis.^[3]

It is most notably distinguished from other species of Tyttocharax by the presence of bony hooks on the caudal and pectoral fin rays, and distinguished from T. madeirae and T. cochui by its absence of an adipose fin and by the bony hooks of its anal fins being longer than those on its pelvic fins, rather than being the same size.^[3]

T. metae has only been found in the Güejar river system of the Orinoco Basin in Colombia.^[2] It is found in fast-running streams with high dissolved oxygen content.^[3]