Abstract
A group of late Llandovery and, exceptionally, earliest Wenlock encrinurine trilobites from the Baltic area, the British Isles, and Canada, is recognized as monophyletic. The generic nameWallacia Lamont 1978 is available for this group.Wallacia is regarded as sister taxon toEncrinurus sensu stricto. A systematic revision of species from Gotland recognizesW. laevis (Angelin 1851), from the Upper Visby Beds, andW. jaanussoni n. sp. andW. masterleei n. sp. from the Lower Visby Beds. Cladograms based on seventeen characters for the ten named species ofWallacia placeW. masterleei andW. laevis as the closest relatives of a Canadian Telychian clade that includesW. elegantula (Billings 1866),W. chattertoni n. sp., andW. hypolepra (Stearn 1956).
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