From editor or global species database
Type species The type by monotypy is Circeis armoricana. Hartman (catalogue, 1959: 570) lists only C. armoricana as a Circeis species. However, Fauchald (1977) lists the type species of Circeis as being Serpula spirillum Linnaeus, but this is impossible as Saint-Joseph created Circeis as a monotypic genus for Circeis armoricana. The explanation for the error is that at the time Fauchald was publishing his guide to genera Circeis armoricana had become considered a synonym of Serpula spirillum. This is no longer the situation, and they are distinct according to Rzhavsky et al (2014). Even if C. armoricana was a synonym of Serpula spirillum it would remain type species of Circeis. Type species are permanent and are unaffected by their possible synonymies. [details]