Data from: Sperm head morphology is associated with sperm swimming speed: a comparative study of songbirds using electron microscopy

Hanna Nyborg Støstad, Arild Johnsen, Jan Terje Lifjeld & Melissah Rowe
Sperm exhibit extraordinary levels of morphological diversification across the animal kingdom. In songbirds, sperm have a helically shaped head incorporating a distinct acrosomal membrane or ‘helical keel’, the form and extent of which varies across species. The functional significance of this helical shape, however, remains unknown. Using scanning electron microscopy, we quantified inter- and intra-specific variation in sperm head morphology across 36 songbird species (Passeriformes: Passerida). Using phylogenetic comparative methods, we investigated the relationship between...
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