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Diphyllobothrium pacificum specimens. 1, Top left: heart-shaped scolex. 2, Top center: proglottid showing the uterus (U), transversal sulci (ST), and uterine pore (UP). 3, Top right: egg (operculum = 60 μm). 4, Bottom: strobila of D. pacificum (approximate length = 70 cm).
