The living species of the genus Hydatina Schumacher, 1817, (Mollusca: Gastropoda: Opistobranchia: Hydatinidae) with the description of a new species

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith