Corydoras, Lacepede, 1803

Tencatt, Luiz F. C., Vera-Alcaraz, Héctor S., Britto, Marcelo R. & Pavanelli, Carla S., 2013, A new Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the rio São Francisco basin, Brazil, Neotropical Ichthyology 11 (2), pp. 257-264 : 261-262

Identification key to the species of Corydoras from the rio São Francisco basin

1. Nuchal plate deeply in contact with posterior process of parietosupraoccipital by a small notch in the latter; snout relatively rounded ................................................................. 2

1’.Nuchal plate not in contact with posterior process of parietosupraoccipital; snout relatively pointed .............................................................................. C. difluviatilis

2. Body with a series of relatively large dark blotches along junction of body plates; first infraorbital very large, conspicuously expanded towards its anteroventral margin, and almost entirely covering lateral margin of the snout ( Fig. 2a ) ................................................................................... 3

2’. Body with small dark blotches scattered all over the flank and dorsum, not forming defined series; first infraorbital large, but not covering significantly the lateral margin of the snout ( Fig. 2b ) ..................................... C. multimaculatus

3. Dorsum with a series of longitudinal blotches, one on anterior origin of dorsal fin base, other on posterior origin of dorsal fin base, the third on the base of adipose fin and the last one on the base of caudal fin; rounded blotches on junction of lateral body plates; body deep (approximately 38.5% of SL) ..................................... C. garbei

3’. Dorsum with small rounded or striated blotches scattered over the aforementioned areas; oblong blotches on junction of lateral body plates; body slender (approximately 30.9% of SL) ...................................................................... C. lymnades

Figures

Fig. 2. Schematic drawing of the head of (a) Corydoras lymnades, (b) Corydoras flaveolus and (c) Corydoras difluviatilis in lateral view.Abbreviations: io1: infraorbital 1, io2: infraorbital 2, sph: sphenotic, cpt: compound pterotic.