Austrolebias charrua Costa & Cheffe 2001

Two apomorphic color patterns, body bright gray with dark gray to black stripes in males (versus light gray or no stripes; stripes of equal size to, or wider than the light interspaces) and a vertically paired black blotch on caudal peduncle of juveniles and females (versus small spots irregularly arranged, or a single round dorsally positioned spot, or no spots on caudal peduncle). Scales on longitudinal series 28-30, supraorbital neuromasts 19-24, caudal fin rounded (fin rays 23-26), pharyngobranchial teeth 2-5. Dorsal fin origin anterior to anal fin origin in females.

Dorsal spines (total): 0; Dorsal soft rays (total): 16 - 26; Analspines: 0; Analsoft rays: 21 - 29; Vertebrae: 28 - 31