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From Bertaco, VA & AR Cardoso, 2005. A new species of Microglanis (Siluriformes: Pseudopimelodidae) from the rio Uruguay drainage, Brazil. Neotropical Ichthyology 3: 61-67.

http://dx.doi.org/10.1590/S1679-62252005000100002

Key to species of Microglanis from southern Brazil

• 1. Caudal fin almost completely black, with a narrow vertical white band near middle length of caudal-fin rays; maxillary barbel short, not passing pectoral-fin origin.....
  Microglanis malabarbai
  (rio Ijuí, tributary of middle rio Uruguay drainage)
  • 1'. Caudal fin with wide white band near middle of caudal-fin rays; maxillary barbel long, passing pectoral-fin origin ..... 2
• 2. Mouth gape large (67-85% of HL), head shallow (depth 4248% of HL) and squarish in dorsal view in large specimens.....
  Microglanis eurystoma
  (upper rio Uruguay drainage)
  • 2'. Mouth gape small (50-70% of HL), head deep (depth 55-78% of HL) and rounded in dorsal view in large specimens..... 3
• 3. Body narrow (width 22-29 % of SL), head short (25-29% of SL), and dorsal, pectoral, pelvic, and anal fins with a black distal band.....
  Microglanis cibelae
  (coastal drainages from northern Rio Grande do Sul and Santa Catarina states)
  • 3'. Body wide (width 27-34% of SL), head long (29-34% of SL), and dorsal, pectoral, pelvic, and anal fins with scattered chromatophores.....
    Microglanis cottoides
    (rio Jacuí and rio Uruguay drainages)

From Shibatta, O. A, and R. C Benine. 2005. A new species of Microglanis Eigenmann, 1912 (Siluriformes: Pseudopimelodidae) from upper rio Parana basin, Brazil. Neotropical Ichthyology, 3 (4): 579-586. https://doi.org/10.1590/S1679-62252005000400015

Key to species of Microglanis from southern Brazil:

• 1. Squarish head in dorsal view (more pronounced in adults); mouth width 67-85 % HL.....
  Microglanis 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 .....
  Microglanis 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 .....
    Microglanis garavelloi
    (upper Paraná drainage)
• 4. Dorsal and anal fins entirely dark brown.....
  Microglanis 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.....
  Microglanis 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.....
  Microglanis cottoides
  (laguna dos Patos and rio Uruguai drainages)
  • 6'. Body width 22-29% of SL, head length 25-29% of SL.....
    Microglanis cibelae
    (coastal drainages from northern Rio Grande do Sul and Santa Catarina states)

Sarmento-Soares, LM, RF Martins-Pinheiro, AT Aranda and CC Chamon, 2006. Microglanis pataxo, a new catfish from southern Bahia coastal rivers,northeastern Brazil (Siluriformes: Pseudopimelodidae). Neotropical Ichthyology, 4: 157-166.

http://www.ufrgs.br/ni/vol4num2/vol4(2)p157.pdf

Key to species of Microglanis from coastal drainage between Rio de Janeiro and Bahia states:

• 1. Head width moderately large, ranging between 67.8-87.0% of HL; head and body color pattern mottled in light and dark brown, pectoral, pelvic, and adipose fins light colored or hyaline..... 2
  • 1’. Head width very large, ranging between 96.2-100.0% of SL[sic; HL, not SL]; head and body color pattern mostly black or dark brown, pectoral, pelvic, and adipose fins dark colored.....
    Microglanis nigripinnis
    (rio Macacu and rio São João coastal drainages)
• 2. Head width comparatively large (78.4-85.3% of HL), pleural
  ribs 6.....
  Microglanis parahybae
  (rio Paraíba do Sul drainage, coastal drainages of Rio de Janeiro and rio Doce drainage)
  • 2’. Head width comparatively narrow (67.8-74.3% of HL), pleural ribs 7.....
    Microglanis pataxo
    (coastal river drainages of southeastern Bahia)