ANALYSIS OF ENZYMES IN THE BULINUS-AFRICANUS GROUP (MOLLUSCA, PLANORBIDAE) BY ISOELECTRIC-FOCUSING

Four enzyme systems have been analysed in digestive gland extracts of-snails of the Bulinus africanus group. Forty population samples, representing eight of the ten nominal species recognized in the group, have been examined. Three distinct enzyme types were recognized in each of three of the systems and ten types in the fourth. Few of the individual enzyme types show marked restriction in either their taxonomic or geographic distributions. However, certain combinations of types appear to be associated with some nominal taxa and others with regional distributions. © 1979 Taylor & Francis Group, LLC.