Subcellular organisation of Dactylosoma cf. ranarum SK secondary merogonic stages. A) Meront with budding merozoites. B) Apical end of the merozoite shown in A. C) Meront with budding merozoites. D; E) Anterior region of the merozoite shown in C (two different sections). F) High magnification of the pellicle and subpellicular microtubules in a budding merozoite. G) Tangential section through the anterior region of a merozoite following erythrocyte invasion. H) Cross-sectioned posterior region of a merozoite with a prominent micropore after erythrocyte invasion. Transmission electron microscopy. a – amylopectin granule, black arrowhead – parasite plasma membrane, black asterisk – microneme(s), c – conoid, cr – preconoidal rings, db – dense body, double black arrowhead – inner membrane complex, e – erythrocyte, er – rough endoplasmic reticulum, l – lipid droplet, m – mitochondrion, n – nucleus, pr – polar ring(s), small white arrow – subpellicular microtubule, v – vacuole, white arrow – extensions of the parasitophorous vacuole membrane into the erythrocyte cytoplasm, white arrowhead – parasitophorous vacuole, white asterisk – apical pole of a budding merozoite, white circle – micropore.