Abstract
Potamonautid river crabs were collected from e ve localities in northeastern KwaZulu-Natal to determine biochemical and morphological differentiation among these populations. Two distinct forms were included in these collections. One of the forms could be identie ed as Potamonautes sidneyi, whereas the other was previously unknown. Biochemical analysis of 21 presumptive allozyme loci showed the two forms to be distinct, separating at a genetic identity value of 0.829. A e xed allele difference at the HEX locus in the sympatric populations of the two forms indicated that they were reproductively isolated. Morphometric analysis of seven carapace variables, by means of a discriminant function analysis, showed the two forms to be distinct. The unidentie ed form, which appears to be cone ned to patches of swamp forest in northeastern KwaZulu-Natal, is described in this paper as Potamonautes lividus sp. nov.
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