<i>Macrostomum lignano</i> (IMAGE)

Bielefeld University

<i>Macrostomum lignano</i>

Caption

Sperm come in all shapes and sizes: the sperm cell of the flatworm Macrostomum lignano (picture) has a frontal "feeler" (right) and two lateral bristles that may function to anchor the sperm inside the female sperm-receiving organ.

Credit

Photo: Bielefeld University

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