Semisulcospiridae

Semisulcospiridae, common name semisulcospirids, is a family of freshwater snails, aquatic gilled gastropod mollusks with an operculum, in the superfamily Cerithioidea.

Semisulcospiridae diversified from the Pleuroceridae about 90 million years ago, in the Cretaceous.

Distribution
The family Semisulcospiridae occurs in western North America, the Far East of Russia, Korea, Japan, China and Vietnam.

Taxonomy
The family Semisulcospiridae was introduced as just a name (nomen nudum) by Morrison (1952), without a diagnosis of the taxon. It is a valid taxon however, because its name has been used as valid.

2005 taxonomy
According to the taxonomy of Bouchet & Rocroi (2005), Semisulcospiridae was a subfamily within the family Pleuroceridae.

2009 taxonomy
The subfamily Semisulcospirinae within the Pleuroceridae was elevated to family level as Semisulcospiridae by Strong & Köhler (2009).

Genera
There is very high level of mitochondrial heterogeneity in apparent species of Semisulcospiridae (highest among gastropods, also with Pleuroceridae), that has not been sufficiently explained yet as of 2015.

Genera within the family Semisulcospiridae include:
 * Hua S.-F. Chen, 1943
 * Juga H. Adams & A. Adams, 1854
 * Koreoleptoxis J. B. Burch & Y. Jung, 1988
 * Koreoleptoxis globus
 * Semisulcospira O. Boettger, 1886 - the type genus
 * Genera brought into synonymy:
 * Biwamelania Matsuoka, 1985 : synonym of Semisulcospira O. Böttger, 1886
 * Koreanomelania: synonym of Koreoleptoxis J. B. Burch & Y. Jung, 1988
 * Namrutua Abbott, 1948 : synonym of Semisulcospira O. Böttger, 1886 (junior synonym)
 * "Parajuga": synonym of Juga H. Adams & A. Adams, 1854 (unavailable name: no type species designated)
 * Senckenbergia Yen, 1939 : synonym of Semisulcospira O. Böttger, 1886 (junior synonym)