Tylograptus, Sinograptus, Pterograptus, Syndyograptus, and Reteograptus pulcherrimus are described from northern Yukon. The last three taxa are recognized for the first time in northern Canada. Reteograptus pulcherrimus occurs in Ashgillian age beds, the remainder in Llanvirnian and Llandeilian beds. All taxa are found in regions bordering the present Pacific or Arctic Oceans; however, Pterograptus also occurs in the Baltic region, and Syndyograptus is found in the Appalachian region.

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