Hi Constantine Not that it necessarily applies here but... I have seen before where this was done when the Author described it in one publication and figured it in another. Some of Dall's works were this way 1881, 1885, 1889 For example I have seen Calliostoma (Fluxina) brunneum (Dall 1981) also listed as 1889. Also there are submission dates and publishing / printing dates that could be more than one year... Perhaps that is the issue on this one? Regards, Leslie Allen Crnkovic HARF/IMCS > Dear all. > I have come across a reference for a bivalve family name thus: > SEMELIDAE Stoliczka, 1870 (1850) > Can anyone explain the extra date? > Thank you. > > -- > Constantine Mifsud, > 4, Shepherds' Str., > Rabat RBT 02, > MALTA. > e-mail: [log in to unmask] >