Vol. 60, 2021
(update: 2021.01.22; 03.17)
Revisiting a 135-year-old Taxonomic Account of the Freshwater Snail Semisulcospira multigranosa: Designating its Lectotype and Describing a New Species of the genus (Mollusca: Gastropoda: Semisulcospiridae)
Naoto Sawada1,2,* and Takafumi Nakano2
of Applied Biosciences, Graduate School of Agriculture, Kyoto
University, Kyoto 606-8502, Japan. *Correspondence: E-mail:
Received 2 September 2020 / Accepted 1
The type series of Semisulcospira multigranosa
Boettger, 1886 was found in the Malacological Collection at the
Senckenberg Naturmuseum for the first time ca. 135 years after its
original description. The syntypes consisted of 38 specimens that can
be classified into four species. The examination of adult shell
morphology of these original materials revealed that the current
taxonomic account of S. multigranosa
should be amended. Therefore, we designate a lectotype for S. multigranosa, and thus describe S. multigranosa auct. as Semisulcospira davisi sp. nov. Semisulcospira davisi can be
discriminated from the other congeners by the characteristics of adult
and embryonic shells, and radulae morphology. The present study
resolves one of the fundamental taxonomic problems remaining in
Key words: Freshwater snail, Lake Biwa, Syntypes, Viviparous, Radula morphology.
Citation: Sawada N, Nakano T. 2021.
Revisiting a 135-year-old taxonomic account of the freshwater snail Semisulcospira multigranosa:
designating its lectotype and describing a new species of the genus
(Mollusca: Gastropoda: Semisulcospiridae). Zool Stud 60:7. doi:10.6620/ZS.2021.60-07.