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  • top jaw barbel not joined to head by membrane
    lower jaw & belly: 7 + barbels
  • top jaw barbel joined to head by membrane, has accessory barbel
    flank - no ridges except LL
    2 pairs lower barbels, under head only
  • top jaw barbel joined to head by membrane, no accessory barbel
    flank - 3-4 ridges
    2 pairs lower barbels, under head only