Hypostomus

Lustosa-Costa, Silvia Yasmin, Ramos, Telton Pedro Anselmo, Zawadzki, Cláudio Henrique & Lima, Sergio Maia Queiroz, 2022, Review of the armoured catfish genus Hypostomus (Siluriformes: Loricariidae) from the Parnaíba River basin, Northeastern Brazil, with description of a new species, Neotropical Ichthyology (e 210126) 20 (1), pp. 1-26 : 16

Key to the species of Hypostomus from Maranhão-Piauí ecoregion

1a. Dark vermiculated color marks ................................... Hypostomus vaillanti ( Fig. 7) 1b. Rounded dark spots.................................................................................................. 2 2a. Premaxilla and dentary, each with more than 100 teeth........................................ 3 2b. Premaxilla and dentary each with less than 100 teeth ............................................ 4

3a. Anteromedial region covered by plates and odontodes and ventral lobe of caudal-fin much longer than dorsal lobe .......... Hypostomus johnii ( Fig. 8 )

3b. Anteromedial region deprived of plates and odontodes and the caudal-fin ventral lobe slightly longer than dorsal lobe.......... Hypostomus velhomonge ( Fig. 3 )

4a. Body and head covered with spots usually smaller than the diameter of the eye ....................................... Hypostomus pusarum ( Fig. 9)

4b. Body and head covered with spots usually larger or the same size as the diameter of the eye, conspicuous and spaced..... Hypostomus aff. pusarum ( Fig. 10 )

Figures

FIGURE 3 | Hypostomus velhomonge, UFPB 9565, holotype, 118.0 mm SL, rio Balsas, tributary of Parnaíba River, Maranhão State, Brazil.

FIGURE 8 | Hypostomus johnii, UFPB 9268, 107.7 mm SL. Poti River, tributary of the Parnaíba River basin, Crateús, Ceará, Brazil.

FIGURE 10 | Hypostomus aff. pusarum, UFPB 11077, 164.5 mm SL, Ingazeiro reservoir, Paulistana, Piauí, Brazil.