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length D base 62-77% distance between exposed nost
D origin well behind pelvicsdistance between 5th gill slits > distance between nostrils -
head pointedtop black + many white spots, rings or short linestail: long, 2-6 spines
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length D base ~distance between exposed nostrils
D origin just behind rear edge of pelvicdistance between 5th gill slits ~distance between nostrils