Serrapinnus, Malabarba, 1998

Ota, Renata Rúbia, Deprá, Gabriel de Carvalho, Graça, Weferson Júnio da & Pavanelli, Carla Simone, 2018, Peixes da planície de inundação do alto rio Paraná e áreas adjacentes: revised, annotated and updated, Neotropical Ichthyology 16 (2), pp. 1-111 : 36-37

Serrapinnus

1. Lateral line completely pored ....................... S. heterodon

1’. Lateral line incompletely pored..................................... 2

2. Dorsal and anal fins with black pigmentation................. 3

2’. Dorsal and anal fins hyaline........................................... 4

3. Longest unbranched ray and proximal portion of remaining dorsal-fin rays black; unbranched anal-fin rays dusky ................................................................. S. notomelas

3’. Distal portion of dorsal fin and anal-fin lobe with a round, black blotch.................................... Serrapinnus sp. 2

4. Dentary teeth wide, with 7-9 cusps gradually decreasing in size .................................................................. S. calliurus

4’. Dentary teeth slender, with 3-5 cusps of different size and central cusp longer than the lateral ones ..................... ................................................................... Serrapinnus sp. 1