In current publications, we generally use IRSNB to cite specimens of Recent fishes and herps from Institut royal des Sciences naturelles de Belgique. In the past, a variety of codes have been used to cite such specimens, including: IRScNB, ISBN, ISNB, ISNM, KBIN, KNMB, MRHN, RIB. What is the preferred code for citing specimens in publications? Is this specified in the Directory? Are obsolete codes included in the Directory? Thanks.