Trunk myomeres number 63-74. The bar below the mouth has 6-10 cusps. This species is distinguished from other Canadian lampreys by having 2 dorsal fins, the bar above the mouth with 2-3 pointed cusps, teeth along each side of the mouth bicuspid and pointed, and by distribution. Adults are blue-grey when spawning with orange tinges on the head, back, tail and fins. Otherwise brown is the overall color, the belly is white to light grey and fins are yellowish. Ammocoetes are pale brown (Ref. 12204).