Uncommon species . Adults occur in shallow coastal waters, usually in turtle grass beds . Oviparous, with oval pelagic eggs floating in a gelatinous mass .
Scales on body in anguilloid pattern, somewhat overlapping, interorbital region scaled, opercle naked, cheeks, top of head forward to centre of interorbital region scaled; ethmoid spine reduced to a low bump; gill chamber and guts pale; no pyloric caeca; males with posterior opening on swim bladder; the two pelvic fin rays equally long or very nearly so .: elongated.
Behavioural data for Dusky cusk-eel is currently being reviewed.
Marine; demersal. Subtropical South America.
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