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Circulatory and excretory systems of P. cornuta (schematic drawing, right view and histological cross-sections). A: narrow and wide lumen of kidney. B: transition of renopericardioduct and kidney. Abbreviations: ao, aorta; at, atrium; kn, narrow lumen of kidney; kw, wide lumen of kidney; ndd, dorsal branch of nephroduct; ndv, ventral branch of nephroduct; np, nephropore; pc, pericardium; rpd, renopericardioduct; v, ventricle. Not to scale.
