From editor or global species database
Type species The type species of Spirorbis is Serpula spirorbis Linnaeus, 1758 by absolute tautonymy (Code article 68.4, and see Bieler & Petit 2011: 19). However, the determination is confused in the prior literature. It cannot be Spirorbis borealis Daudin, 1800 as that name, whether valid or not, is junior to Spirorbis spirorbis (originally Serpula spirorbis). Importantly, Spirorbis borealis is not a distinct species, rather it is Daudin's name for Serpula spirorbis. However, the type species of Spirorbis has been often given as Spirorbis borealis, such as in the Hartman catalogue (1959: 601), in the book on Arctic Serpulidae of Rzhavsky et al (2014: 133), and in the spirorbin monograph of Vine (1977: 9) who states that "Daudin established the genus Spirorbis with S. borealis as the type-species", although that statement is not correct.
Spirorbis borealis was first introduced as a name when Daudin named and briefly described Spirorbis genus, but there Daudin (1800: 37) stated he included three species already known, and then listed three pairs of names with the new Spirorbis combination listed first in each pair. Two of these were unexceptionable recombinations from Linnaean (1758) Serpula names with the species epithet unchanged (Spirorbis planorbis and Spirorbis spirillum), but the third was Spirorbis borealis, a changed (novel) name from the original of Serpula spirorbis Linnaeus. This looks like a superfluous new name for the species of Linnaeus, perhaps because Daudin did not want to use the tautonymous combination of "Spirorbis spirorbis". As an unnecessary renaming it would be invalid, alhough the name would possibly be available. Daudin also added two further species in the same work later on page 48, but he does not state a type species (an action not to be expected at that date) thus the type determination, if it was not already decided by applying Code article 68.4, would need to be a subsequent one from amongst the valid Spirorbis names of Daudin. Subsequent designation of S. borealis would be invalid, as the name is both invalid as superfluous and as junior to the Linnaean name. [details]