The paper lists, defines and classifies all types of aneuploids known hithe
rto. Categorisation has been made on the basis of the alterations of chromo
some number and gene content. The change in nomenclature of some aneuploids
has been warranted by the fact that some names that are in vogue do not re
flect the precise nature of the aneuploid and, are therefore, ambiguous. Fo
r these ambiguous terms new names have been proposed.