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ribbon-like, v compressed; long snout; large eyeD III, 115-135, no notch
A = tiny, imbedded spinestail base slender, tapering, pointed, no Clarge mouth, lower jaw projecting
large fangsno pelvics -
no nape crestD 90-109 elements, spiny part slightly < soft part, notch between spines & raysC small, forkedpelvics: absent in adults, I tiny spine in juveniles
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crest on nape
eyes not large, on sideD elements 116-123, few front weak spines, no notchC small, forkedpelvic tiny: I,1 -
no nape crestD XXXI-XLVI, 68-112, notched, spiny part ~1/2 soft partC small, forkedpelvics tiny I,1
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crest over eye to nape, head profile steep
eye not large, on sideD no notch, 81-93 elements, 1st spine not elongateC small, forkedpelvic = I, 0, like a scale -
very elongate, very compressedD1 deep notch, XXVI-XXXII, low, long base
D & A: 5-7 finlets behindtail base - no keelslong mouth
large, conical teethscales small, skin smooth
2 LL along back -
head long, + nape crest
eye large, high on headD no notch, VII-X weak spinesC small, forkedpelvic tiny, I, 1-2