Siphonaria sowerbyi Michelin 1832

Siphonaria sowerbyi Michelin, 1832 Siphonaria sowerbyi Michelin 1832: unpaginated, pl. 17 (without type locality).— Anton 1838: 26; Hanley 1858b: 152; Paetel 1889: 429; Hubendick 1946: 69; White & Dayrat 2012: 68. Taxonomic remarks. The original description and original figure of Michelin (1832) do not provide enough detail to resolve the identity of this species. No type specimen(s) are known to exist (Philippe Bouchet; pers. comm.).While the original figure in Michelin (1832: pl. 17) matches the features of the atra group, particularly that of S. atra and S. alba, this species remains indeterminable. Hubendick (1946: 69) incorrectly rejected S. sowerbyi as a nomen nudum (followed by White & Dayrat, 2012: 68). Morrison (1972: 56–58) treated S. sowerbyi Michelin, 1832, S. sowerbyi Guerin, 1832 and S. sowerbyi Michelin,1868 as synonyms of S. laciniosa based on similarity in shell form and ‘common reproductive development’. These synonymies are not accepted here. This nominal species remains a nomen dubium.