
%0 Journal Article
%A Ewers, WH 
%T Polymorphism in fossil Velacumantus australis (Gastropoda : Potamididae)
%J Australian Journal of Zoology
%D 1966/10/01
%V 14
%N 5
%P 867-875
%K 
%R https://doi.org/10.1071/ZO9660867
%U https://www.publish.csiro.au/paper/ZO9660867 
%X The snail Velacumantus australis occurs in banded and unbanded forms. An examination of fossil and living material from a shell spit at Wallaga Lake shows that the frequency of the white-banded form varied between 2.11 and 4.47% during the last 2500 yr. Such minor fluctuation is consistent with the hypothesis that these two forms are maintained as a selectively balanced polymorphism. Predatory gastropods may kill more unbanded than banded juvenile snails. 
