Microglanis, C.H.Eigenmann, 1912

Shibatta, Oscar Akio & Benine, Ricardo Cardoso, 2005, A new species of Microglanis (Siluriformes: Pseudopimelodidae) from upper rio Paraná basin, Brazil, Neotropical Ichthyology 3 (4), pp. 579-585 : 580

Key to species of Microglanis from southern Brazil:

1. Squarish head in dorsal view (more pronounced in adults); mouth width 67-85 % HL ....................................................... ........................ M. eurystoma (upper rio Uruguai drainage)

1´. Conical head in dorsal view; mouth width 50-72.4% HL...2

2. Dark blotch beneath adipose fin not extending to anal fin as continuous bar …………………………………….…… 3

2´. Dark continuous bar on posterior flank from base of adipose fin to that of anal fin ……………………………….. 4

3. Caudal-peduncle depth 9.8-11.4% of SL, pectoral-girdle width 25.6-29.7% of SL .............................................................................. M. parahybae (rio Paraíba do Sul drainage)

3´. Caudal-peduncle depth 10.8-16.8% of SL, pectoral-girdle width 28.2-33.9% of SL ...................................................................................... M. garavelloi (upper Paraná drainage)

4. Dorsal and anal fins entirely dark brown ................................ M. nigripinnis (rio Macacu and rio São João drainage)

4´. Dorsal and anal fins dark distally but with light areas near base ...................................................................................... 5

5. Maxillary barbel short, not reaching pectoral-fin origin, caudal fin almost entirely black with narrow vertical light band near base .............. M. malabarbai (rio Ijuí drainage)

5´. Maxillary barbel extending to pectoral-fin origin, caudal fin almost entirely black or light with large dark brown band in middle ...................................................................... 6

6. Body width 27-34% of SL, head length 29-34% of SL ....... M. cottoides (laguna dos Patos and rio Uruguai drainages)

6´. Body width 22-29% of SL, head length 25-29% of SL ........................................... M. cibelae (coastal drainages from northern Rio Grande do Sul and Santa Catarina states)