48132 Gymnotus cylindricus La Monte, 1935 Gymnotidae Naked-back knifefishes Gymnotinae Gymnotiformes Teleostei Central America: Motagua River basin, Guatemala. AMNH 24441 1963 Gymnotus cylindricus AMNH 24473 1963 Gymnotus cylindricus AMNH 31520 1971 Gymnotus cylindricus AMNH 31530 1971 Gymnotus cylindricus AMNH 31657 1971 Gymnotus cylindricus AMNH 31707 1971 Gymnotus cylindricus AMNH 32092 1973 Gymnotus cylindricus AMNH 32192 1973 Gymnotus cylindricus AMNH 32203 1973 Gymnotus cylindricus AMNH 35164 1974 Gymnotus cylindricus AMNH 35171 1974 Gymnotus cylindricus ZMH 8115 1992 Gymnotus cylindricus