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Sperm bundles ejaculated by mature males of C. savignyi. (a) PSA-FITC staining of sperm bundles. Sperm nuclei (N) are stained in blue with DAPI, while sperm acrosome (A) and bundle cap (C) stain with PSA-FITC (green) (Picture: L. Twyffels). Scale bar, 10 µm. (b) Scanning electron micrograph of a sperm bundle showing the cap and the sperm flagella. The white arrow (W) designates the base of the cap (Picture: D. Monteyne and D. Perez-Morga). Scale bar, 10 µm.
