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Abstract
A review of the genus Semiorbis is given, including its taxonomic history, a discussion of its current taxonomic position and morphological descriptions. One new species is described and one new combination. Comments on the relationships of Semiorbis with the family Eunotiaceae are made. Semiorbis rotundus sp. nov., is known only from North America; Eunotia catillifera is transferred to the genus Semiorbis.