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  • 1 sharp spine at front of snout
    head scaled
    pelvic = 2 filaments under eye
    scales small, round, in horizontal rows
  • snout: spine (if present) sharp
    down-pointing
    head scaleless
    pelvic = 2 filaments under eye
    scales: elongate, in oblique rows
  • snout spine: blunt, points obliquely up
    head scaleless
    pelvic = 2 unequal threads under eye
    scales small, elongate, oblique pattern
  • snout with bump
    top of head & cheek scaled
    pelvic = 2 unequal rays, under eye
    scales elongate, obliquely overlapping