Abstract
In summary, we in South Africa are fortunate to have access to some of the best data in the world on the biodiversity of the biotas of our rocky shores, coastal waters and estuaries. We also have large, well-curated collections of most of the taxa. Of course the reason that we have such a wealth of data is that we have been fortunate to have had dedicated biologists who recognised the value of detailed, quantitative and systematic information on our aquatic ecosystems.