Relationship between host shell length (mm) and parasite body length (μm) per sex for each <i>Mytilicola</i>-host species combination.

<p>(A) <i>M</i>. <i>orientalis</i> in blue mussels (<i>Mytilus edulis</i>). (B) <i>M</i>. <i>intestinalis</i> in blue mussels. (C) <i>M</i>. <i>orientalis</i> in Pacific oysters (<i>Magallana gigas</i>). Fitted lines are significant regressions.