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Morphology of spermatozoa in bivalves that transmit sperm mitochondria to the progeny. (a) Spermatozoon of a freshwater mussel (Elliptio fumata, family Unionidae). (b) Spermatozoon of a marine clam (Ruditapes philippinarum, family Veneridae). (c) Magnification of R. philippinarum mitochondrial midpiece (transversally and longitudinally sectioned). n, nucleus; m, mitochondrion.
