Notes on Naiad taxonomy (Bivalvia: Unionoida) 2. the genus Prisodontopsis Tomlin, 1928

The taxonomic status of the African freshwater bivalve ‘Unio johnstoni Smith’ (non Unio johnstoni Etheridge, 1881) belonging to the genus Prisodontopsis Tomlin, 1928 is reviewed. A lectotype is selected and a new replacement name (Prisodontopis aviculaefornis) proposed. The subfamily Dentaspatharinae Modell, 1964 (a replacement name for Pseudaviculinae Modell, 1942) is restricted to fossil species belonging to Dentaspatharia. The subfamily Prisodontopsinae Pain & Woodward, 1968 should be retained for the Recent genus Prisodontopsis Tomlin, 1928.