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