Trematode Parasitism and Polymorphism in a Marine Snail

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Science  25 Jun 1965:
Vol. 148, Issue 3678, pp. 1747-1748
DOI: 10.1126/science.148.3678.1747


Velacumantus australis is a common Australian snail which harbors several larval trematodes. Many populations have a small proportion of banded shells. Analysis of three samples from a coastal lake shows that banded snails are less likely to harbor larval trematodes than unbanded snails.