Fig. 4

Cercaria edgesii cercariae, body-wall musculature. a: ventral view; b: dorsal view; c: part of dorsal body wall showing three main muscle layers; d: anterior part of the trunk (dorsal view). ao – anterior organ; alm – dense longitudinal bundles close to the anterior organ; aob – border of the anterior organ; cm – circular muscle fibers; dm – diagonal muscle fibers; lm – longitudinal muscle fibers; t – tail; tmb – dense muscle bundles close to the tail basis; vs – ventral sucker. Scale bars 10 μm