Fig. 1
Left pectoral fin of Eurycheilichthys paucidens, AMNH 238572, 55.7 mm SL, paratype, male, dorsal view. Arrow indicates fleshy flap along posterodorsal margin of pectoral-fin spine. Scale = 2 mm.
Fig. 2
Arrangement of abdominal plates and exposed area of pectoral girdle. a. Eurycheilichthys pantherinus, MCP 22373, 44.0 mm SL. b. E. limulus, MCP 13086, 42.2 mm SL. c. E. apocremnus, MCP 25678, 45.1 mm SL. d. E. castaneus, MCP 22134, 47.8 mm SL. e. E. coryphaenus, MCP 40667, 51.8 mm SL. f. E. luisae, MCP 25566, 38.5 mm SL. g. E. paucidens, MCP 22800, 46.1 mm SL. h. E. planus, MCP 22261, 42.2 mm SL. i. E. vacariensis, MCP 22782, 42.1 mm SL. cl = cleithrum, co = coracoid. Anterior towards top. Scale bars = 5 mm.
Fig. 3
Head and anterior portion of body of Eurycheilichthys coryphaenus, MCP 31160, 43.6 mm SL, paratype, male, lateral view. Arrow indicates conspicuous elevation of the parieto-supraoccipital. Scale = 2 mm.
Fig. 4
Eurycheilichthys pantherinus, MCP 22373, 46.3 mm SL, male, Brazil, Rio Grande do Sul, São José dos Ausentes, rio Silveira at Silveira.
Fig. 5
Geographic distribution (black dots) of Eurycheilichthys pantherinus in the upper rio Uruguay basin, South Brazil.
Fig. 6
Eurycheilichthys limulus, MCP 41143, 44.6 mm SL, male, Brazil, Rio Grande do Sul, Julio de Castilhos, arroio Passo dos Buracos.
Fig. 7
Geographic distribution of Eurycheilichthys in South Brazil. Eurycheilichthys apocremnus (white dots), E. castaneus (black dots), E. limulus (black squares), E. planus (triangles), and E. vacariensis (white squares). T = type-locality.
Fig. 8
Eurycheilichthys apocremnus, new species, holotype, MCP 40660, 47.0 mm SL, male, Brazil, Rio Grande do Sul, Barros Cassal, creek tributary to rio Fão.
Fig. 9
Eurycheilichthys castaneus, new species, holotype, MCP 40664, 48.1 mm SL, male, Brazil, Rio Grande do Sul, Marau, arroio Burro Preto, tributary to rio Guaporé. Lateral view of right side and image digitally inverted.
Fig. 10
Eurycheilichthys coryphaenus, new species, holotype, MCP 40665, 46.7 mm SL, female, Brazil, Rio Grande do Sul, Tainhas, arroio Contendas.
Fig. 11
Geographic distribution of Eurycheilichthys in South Brazil. Eurycheilichthys coryphaenus (triangles), E. luisae (black dots), and E. paucidens (black squares). T = type-locality.
Fig. 12
Eurycheilichthys luisae, new species, holotype, MCP 40662, 42.5 mm SL, male, Brazil, Rio Grande do Sul, Arvorezinha, arroio Três Pontes.
Fig. 13
Eurycheilichthys paucidens, new species, holotype, MCP 40661, 61.8 mm SL, female, Brazil, Rio Grande do Sul, Muitos Capões, arroio Tavoqua.
Fig. 14
Eurycheilichthys planus, new species, holotype, MCP 40663, 49.3 mm SL, male, Brazil, Rio Grande do Sul, Guabiju, rio da Prata at Passo do Respraiado.
Fig. 15
Eurycheilichthys vacariensis, new species, holotype, MCP 40659, 47.6 mm SL, male, Brazil, Rio Grande do Sul, Muitos Capões, arroio Espeto or rio Soares.
Tab. 1
Descriptive morphometrics of Eurycheilichthys species. Values are given as percents of standard length or of head length. Hol = holotype. SD = standard deviation. Data in bold are distinguishing features among species.
Tab. 2
Descriptive morphometrics of Eurycheilichthys species. Values are given as percents of standard length or of head length. Hol = holotype. SD = standard deviation. Data in bold are distinguishing features among species.
Tab. 3
Frequency distribution of variable counts of Eurycheilichthys species. Vertebrae and body plates. * = counted in c&s specimens; ** = Both sides of body counted; holotype values are underlined.
Tab. 4
Frequency distribution of variable counts of Eurycheilichthys species. Premaxillary and dentary teeth, counted in both sides; holotype values are underlined.