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  • very elongate; tail <1/3 TL
    tiny eye
    D very short: head & front body
    groove under snout
    front nostril tubular
  • very elongate
    groove under snout
    D origin on head
    tail slightly < 1/2 TL, tip hard
    nostrils: front tubular, rear in mouth
    roof mouth - 2 rows teeth
    teeth between top jaws exposed
    gill openings low on side
    pectoral = tiny flap
  • snout pointed, overhanging, grooved below
    D: high, origin on nape
    tail < 40% TL, tip hard & finless
    front nostril tubular
    gill openings underneath
    no pectorals
  • no groove under snout
    D origin on head, low
    tail slightly < 1/2 TL
    nostrils: front = hole, rear in mouth
    teeth stout
    no pectorals
    gill openings under throat
  • very elongate
    no groove under overhanging snout
    D origin on head, before gill opening
    D & A reach near tail tip
    no C
    teeth between top jaws inconspicuous
    front nostril tubular, rear inside mouth
    gill openings vertical, wide apart below
    no pectorals
  • v elongate
    D origin on head
    tail <1/2 TL, tip fleshy, blunt
    groove under snout
    teeth protrude between top jaws
    no pectorals
    gill opening low