Thelyssa is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.WoRMS (2013). Thelyssa Bayer, 1971. Retrieved through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=492303 on 2013-06-09
Species Species within the genus Thelyssa include: Thelyssa callisto Bayer, 1971
References
External links ITIS World Register of Marine Species