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An Individual Barnacle, Semibalanus Balanoides, with Two Penises

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Abstract During the late fall and early winter of 2007, we collected intertidal barnacles and observed reproductive activity. Among these, we found an otherwise normal barnacle that had two penises. At least one of these penises is inferred to have retained normal function and to have fertilized the egg brood of the barnacle's neighbor.

Affiliations: 1: a (JMH, correspondence, 650 Life Sciences Building, Department of Ecology and Evolution, Stony Brook University, Stony Brook, New York 11794-5245, U.S.A.


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