original description
Carpenter, P. P. (1864). Supplementary report on the present state of our knowledge with regard to the Mollusca of the West Coast of North America. <em>Reports of the British Association for the Advancement of Science.</em> (1863) 33: 517-686., available online at https://www.biodiversitylibrary.org/page/29370651
page(s): 675 [details]
source of synonymy
Johnson, P. D.; Bogan, A. E.; Brown, K. M.; Burkhead, N. M.; Cordeiro, J. R.; Garner, J. T.; Hartfield, P. D.; Lepitzki, D. A. W.; Mackie, G. L.; Tarpley, T. A.; Tiemann, J. S.; Whelan, N. V.; Strong, E. E. (2013). Conservation status of freshwater gastropods of Canada and the United States. <em>Fisheries.</em> 38(6): 247-282., available online at http://www.tandfonline.com/doi/abs/10.1080/03632415.2013.785396
note: Synonym not explicitly indicated, but the type species of Carinifex (Planorbis newberryi Lea, 1858) is attributed to Helisoma. [details] Available for editors [request]
From editor or global species database
Nomenclature Junior objective synonym of Megasystropha, which however has been placed on the Official Index. Placed on the Official List by Opinion 432, 1956, Opinions and Declarations rendered by the ICZN, 14(16): 375, 376, and attributed to Binney, 1865, Smithsonian Miscellaneous Collections, 143: 74. [details]