Harttia tuna Covain & Fisch-Muller 2012

Distinguished from all other species of Harttia except Harttia fluminensis and Harttia trombetensis by having an incomplete abdominal cover restricted to preanal and abdominal lateral plates with a row of platelets joining these two series of plates (vs. absence of row of platelets making junction between preanal and lateral abdominal plates), and by its specific barcode sequence (JF292262). Differs from Harttia fluminensis by having a shallower head (31.96-38.77, mean 36.52 ± 1.80% of HL, vs. 37.31-43.30, mean 38.94 ± 1.42% of HL); and from Harttia trombetensis by the color pattern of the caudal fin (a dark rounded blotch at base of caudal fin, vs. a large dark band). Four morphometricvariables strictly characterize Harttia tuna: longer head (mean = 24.97 ± 1.14%of SL vs 23.19 ± 1.33 < mean < 24.15 ± 1.38% of SL); greater predorsal length (mean = 33.58 ± 0.84% of SL vs. 32.10 ± 1.05 < mean < 33. 01 ± 1.11% of SL); smaller postdorsal length (mean = 55.44 ± 1.10% of SL vs 56.63 ± 0.94 < mean < 57.35 ± 1.26% of SL); and smaller orbital diameter (mean = 20.97 ± 1.12% of HL vs. 22.68 ± 1.43 < mean < 23.37 ± 1.08% of HL) (Ref. 90209).

Dorsal soft rays (total): 7; Analspines: 1; Analsoft rays: 5

Harttia tuna is a species of catfish in the family Loricariidae. It is native to South America, where it occurs in the upper Paru de Oeste River basin in Suriname. The species reaches 17.2 cm (6.8 inches) in standard length. It is known to be very morphologically similar to the related species Harttia fluminensis. Its specific name, tuna, is derived from the Tiriyó language and roughly translates to "river".