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  • crest over eye to nape, head profile steep
    eye not large, on side
    D no notch, 81-88 elements, 1st spine not elongate
    C small, forked
    nostril a crescent
    pelvic = I, 0, like a scale
  • no nape crest
    D XXXVIII-XL (elements 90-96)
    D spiny part slightly < soft part, notch between them
    C small, forked
    pelvics: absent in adults, I tiny spine in juveniles
  • no nape crest
    D XL-XLIV (96-102 elements)
    D spiny part slightly < soft part, notch between them
    C small, forked
    pelvics: absent in adults, I tiny spine in juveniles
  • crest on nape
    long, slender, very compressed
    eyes not large, on side
    D elements 116-123, few front weak spines, no notch
    C small, forked
    pelvic tiny: I,1
  • no nape crest
    D XLIV-XLVI, 104-109, notched, spiny part ~1/2 soft part
    C small, forked
    pelvics tiny I,1, BEHIND pectcoral base
    A II, 93-102
  • no nape crest
    D XXXVIII-XLII, 78-87, notched, spiny part ~1/2 soft part
    C small, forked
    pelvics tiny I,1, UNDER/BEFORE pectoral base
    A II, 69-76
  • prominent nape crest originates before eyes
    eye large, below head profile
    D no notch, VII-X weak spines, 90-96 elements
    C small, forked
    pelvic tiny, I, 1-2
  • ribbon-like, tapering to point, no C
    long snout; large eye
    D III, very long base, no notch, 136-142
    large mouth, lower jaw projecting
    no pelvics; A = tiny, imbedded spines