Eigenmannia trilineata, Lopez and Castello, 1966

Peixoto, Luiz Antônio Wanderley, Dutra, Guilherme Moreira & Wosiacki, Wolmar Benjamin, 2015, The Electric Glass Knifefishes of the Eigenmannia trilineata species-group (Gymnotiformes: Sternopygidae): monophyly and description of seven new species, Zoological Journal of the Linnean Society 175 (2), pp. 384-414 : 387

KEY TO THE SPECIES OF EIGENMANNIA TRILINEATA SPECIES GROUP

1a. Pectoral fin dusky or with conspicuous dark blotch; anal fin uniformly darkened.......................................... ................... Eigenmannia matintapereira sp. nov. (Rio Uneiuxi and Rio Urubaxi, Rio Negro basin, Brazil)

1b. Pectoral and anal fins hyaline............................................................................................................2

2a. Mouth subterminal...........................................................................................................................3

2b. Mouth terminal............................................................................................................................... 4

3a. Body depth at vertical through the tip of the longest pectoral-fin ray, 14.9–18.7% LEA; nine or ten longitudinal series of scales above lateral line ......................................................................................................... .................... Eigenmannia waiwai sp. nov. (Rio Mapuera and Rio Trombetas, Rio Trombetas basin, Brazil)

3b. Body depth at vertical through the tip of the longest pectoral-fin ray, 10.5–14.5% LEA; seven or eight longitudinal series of scales above lateral line.................................................................................................... ................................. Eigenmannia vicentespelaea (caves of São Vicente I and II, Rio Tocantins basin, Brazil)

4a. Suborbital depth, 29.9–46.6% HL........................................................................................................5

4b. Suborbital depth, 18.2–28.9% HL........................................................................................................6

5a. Total number of premaxillary teeth 31–33, arranged in four rows; total number of dentary teeth 31; length of coronomeckelian bone 20% length of Meckel’s cartilage............................................................................ ......... Eigenmannia trilineata (Río Yabebury and Río San Javier, Rio Paraná basin; and Río de La Plata basin, Argentina)

5b. Total number of premaxillary teeth 16 arranged in three rows; total number of dentary teeth 16; length of coronomeckelian bone 45% length of Meckel’s cartilage............................................................................ ....................................................................... Eigenmannia microstoma (Rio São Francisco basin, Brazil)

6a. Inferior medial stripe, one scale high; precaudal vertebrae 11–12............................................................... ............................................. Eigenmannia desantanai sp. nov. (Rio Cuiabá, Rio Paraguai basin, Brazil)

6b. Inferior medial stripe, two or three scales high; precaudal vertebrae 13–15................................................7

7a. Pectoral-fin rays, ii,11–12.................................................................................................................. 8

7b. Pectoral-fin rays, ii,13–15..................................................................................................................9

8a. Orbital diameter 15.4–19.4% HL; 170–198 anal-fin rays; eight or nine endopterygoid teeth; 13–14 precaudal vertebrae. ..... Eigenmannia muirapinima sp. nov. (Igarapé Santo Antônio and Lago Jará, Rio Amazonas basin, Brazil)

8b. Orbital diameter 11.4–15.0% HL; 151–170 anal-fin rays; five or six endopterygoid teeth; 15 precaudal vertebrae.................... Eigenmannia guairaca sp. nov. (Riacho Água do Ó, upper Rio Paraná basin, Brazil)

9a. Width of mouth, 20.0–25.1% HL; 11–13 premaxillary teeth....................................................................... ................................................. Eigenmannia antonioi sp. nov. (Rio Anapu, Rio Amazonas basin, Brazil)

9b. Width of mouth, 10.8–19.0 HL; 15–21 premaxillary teeth......................................................................... ................................................. Eigenmannia pavulagem sp. nov. (Rio Capim, Rio Guamá basin, Brazil)