
TY  - JOUR
A1  - Ewers, WH 
T1  - Polymorphism in fossil Velacumantus australis (Gastropoda : Potamididae)
JF  - Australian Journal of Zoology
JO  - Aust. J. Zool.
Y1  - 1966
VL  - 14
IS  - 5
SP  - 867
EP  - 875
KW  - 
UR  - https://doi.org/10.1071/ZO9660867 
N2  - 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. 
ER  -

