Fig. 15From: Spermatozoa and spermatogenesis in the northern quahaug Mercenaria mercenaria (Mollusca, Bivalvia)Longitudinal section of sperm, showing acrosome (Ac), nucleus (N), posterior nuclear fossa (Pnf), mitochondria (M), proximal centriole (Pc), and distal centriole (Dc); bar 2 μmBack to article page