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  • dark above, grades to pale below
    LL pores no pale spots
    pectoral width 36-86% gill opening length
  • strongly bicolored: dark over light
    LL pores not in pale spots
    Bascanichthys gaira, Colombian Sand-eel
    pectoral = minute, triangular flap with filament, base 17-33% gill opening
  • dark above, abruptly pale below
    LL pores: dark at front, in pale spots at rear
    Bascanichthys inopinatus, Unexpected Eel
    pectoral base 36-37% gill opening
  • dark above fading to pale below
    pale spots above LL pores
    pectoral fin width 17-35% gill opening